Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
|
#1
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
Hi,
My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. Only one of the monitors exhibits the problem--the other continues to function properly. When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick |
#2
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
saber850 wrote in message
... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. Only one of the monitors exhibits the problem--the other continues to function properly. When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://diverse.4mg.com/index.htm |
#3
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 3:21*am, "N_Cook" wrote:
saber850 wrote in message ... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list onhttp://diverse.4mg.com/index.htm Thanks for the quick response. I do not observe discrete jumps in the fading--it seems very smooth to me. I do not know if it is a backlight problem; how can I tell? |
#4
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On Sun, 2 May 2010 00:25:15 -0700 (PDT), saber850
wrote: On May 2, 3:21*am, "N_Cook" wrote: saber850 wrote in message ... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list onhttp://diverse.4mg.com/index.htm Thanks for the quick response. I do not observe discrete jumps in the fading--it seems very smooth to me. I do not know if it is a backlight problem; how can I tell? A backlight gives general brightness to an image. if it is out, the video will still be there and u can see the image if u shine a light on the screen - effectively replacing the backlight. your issue looks like the video is changing - not a backlight issue. check the PS voltages first. |
#5
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 6:39*am, wrote:
On Sun, 2 May 2010 00:25:15 -0700 (PDT), saber850 wrote: On May 2, 3:21*am, "N_Cook" wrote: saber850 wrote in message .... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year.. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list onhttp://diverse.4mg.com/index.htm Thanks for the quick response. *I do not observe discrete jumps in the fading--it seems very smooth to me. I do not know if it is a backlight problem; how can I tell? A backlight gives general brightness to an image. if it is out, the video will still be there and u can see the image if u shine a light on the screen - effectively replacing the backlight. your issue looks like the video is changing - not a backlight issue. check the PS voltages first. The problem isn't occurring at the moment. When it returns, I will try shining a light at the screen to determine if the problem is the backlight. Regarding the supply voltage: both monitors (as well as the computer itself) get their power from an APC UPS. When the problem returns, I will try using the outlet directly on the wall. |
#6
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
saber850 wrote:
On May 2, 3:21 am, "N_Cook" wrote: saber850 wrote in message ... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. Only one of the monitors exhibits the problem--the other continues to function properly. When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list onhttp://diverse.4mg.com/index.htm Thanks for the quick response. I do not observe discrete jumps in the fading--it seems very smooth to me. I do not know if it is a backlight problem; how can I tell? If it is the backlight, you can still see a picture in strong ambient light, try different viewing angles and light angles. If you can still sortof see a picture, it is the backlight. The slow fade suggests the invertor,or its powersupply circuit. |
#7
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 12:32*pm, Sjouke Burry
wrote: saber850 wrote: On May 2, 3:21 am, "N_Cook" wrote: saber850 wrote in message .... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time.. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list onhttp://diverse.4mg.com/index.htm Thanks for the quick response. *I do not observe discrete jumps in the fading--it seems very smooth to me. I do not know if it is a backlight problem; how can I tell? If it is the backlight, you can still see a picture in strong ambient light, try different viewing angles and light angles. If you can still sortof see a picture, it is the backlight. The slow fade suggests the invertor,or its powersupply circuit. If it is the invertor or the power supply circuit, would either be worth repairing/replacing instead of replacing the entire monitor? Is there any part of an LCD monitor whose expense would not justify its replacement, and to simply replace the monitor as a whole? |
#8
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On Sun, 2 May 2010 17:58:59 -0700 (PDT), saber850
wrote: If it is the invertor or the power supply circuit, would either be worth repairing/replacing instead of replacing the entire monitor? Is there any part of an LCD monitor whose expense would not justify its replacement, and to simply replace the monitor as a whole? The Samsung SyncMonster 204/214 is all one big board. There are replacement boards available on eBay but they tend to have the same problem that you're trying to fix. Sending the monitor to the recyclers for such a simple problem will surely bring down upon your head the wrath of all repairmen, ecologists, and toxic waste handlers. To maintain your karma, you must at least make an attempt at repair. Incidentally, having two identical monitors is a bad idea. Sympathetic failure and contagious failure modes has been known to propagate between the bad monitor and the good. I would keep them apart just to be safe. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#9
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On Sun, 2 May 2010 08:21:04 +0100, "N_Cook" wrote:
saber850 wrote in message ... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. Only one of the monitors exhibits the problem--the other continues to function properly. When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip I don't think it is a backlight issue My bet is a circuit problem with something common to all colors. The brightness increases to max, then it goes negative to black. Then it pops back to normal. A lot of monitors have everything wrapped up in one chip. Some ICs may drive the monitor directly. Look for unstable supply voltage. If the voltage is going on/off abruptly but has a big cap on the line that would explain it. |
#10
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 9:40*am, Meat Plow wrote:
On Sun, 2 May 2010 08:21:04 +0100, "N_Cook" wrote: saber850 wrote in message .... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip What brand/model monitor? What brand/model card with NVidia chip? Does the monitor have a DSUB I/O? Does the video card have a DSUB I/O The symptoms don't describe an inverter problem to me but rather an LCD matrix drive, possibley PSU derived. Both monitors are a Samsung SyncMaster 204B. The video card is a ASUS EN7600GT. The monitors have 1 DSUB I/O port and 1 VGA I/O port. I've only ever used the DSUB I/O. The video card has two DSUB I/O ports. Each one is connected to a monitor. As I mentioned in the OP, when the monitor is malfunctioning, I have swapped the DVI cables between the monitors. When doing so, the malfunctioning monitor continues to malfunction while the other monitor (the one which has never malfunctioned) continues to function properly. So from this, I believe the computer & video card are functioning properly. Am I making a valid assessment here? Is the PSU typically isolated from other circuitry in the monitor such that it can be replaced? |
#11
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
saber850 wrote in message ... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. Only one of the monitors exhibits the problem--the other continues to function properly. When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Does this monitor have buttons on the front to control brightness? Could one of those be stuck or shorted? David |
#12
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 11:46*am, "David" wrote:
saber850 wrote in message ... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Does this monitor have buttons on the front to control brightness? Could one of those be stuck or shorted? David It has buttons on the front, but not to control the brightness or contrast directly--those are available a couple levels deep in the menu. When the problem returns, I will try adjusting the brightness & contrast via the monitor to see what happens. |
#13
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 9:22*am, saber850 wrote:
On May 2, 9:40*am, Meat Plow wrote: On Sun, 2 May 2010 08:21:04 +0100, "N_Cook" wrote: saber850 wrote in message .... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year.. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip What brand/model monitor? What brand/model card with NVidia chip? Does the monitor have a DSUB I/O? Does the video card have a DSUB I/O The symptoms don't describe an inverter problem to me but rather an LCD matrix drive, possibley PSU derived. Both monitors are a Samsung SyncMaster 204B. The video card is a ASUS EN7600GT. The monitors have 1 DSUB I/O port and 1 VGA I/O port. *I've only ever used the DSUB I/O. The video card has two DSUB I/O ports. *Each one is connected to a monitor. As I mentioned in the OP, when the monitor is malfunctioning, I have swapped the DVI cables between the monitors. *When doing so, the malfunctioning monitor continues to malfunction while the other monitor (the one which has never malfunctioned) continues to function properly. *So from this, I believe the computer & video card are functioning properly. Am I making a valid assessment here? Is the PSU typically isolated from other circuitry in the monitor such that it can be replaced?- Hide quoted text - - Show quoted text - I don't have any suggestions, but it is definitely Not the backlight. With a fading backlight the picture would just get darker and darker, there would be no video reversal such as shown in the video. |
#15
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 5:14*pm, Jamie
t wrote: hr(bob) wrote: On May 2, 9:22 am, saber850 wrote: On May 2, 9:40 am, Meat Plow wrote: On Sun, 2 May 2010 08:21:04 +0100, "N_Cook" wrote: saber850 wrote in message ... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year.. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip What brand/model monitor? What brand/model card with NVidia chip? Does the monitor have a DSUB I/O? Does the video card have a DSUB I/O The symptoms don't describe an inverter problem to me but rather an LCD matrix drive, possibley PSU derived. Both monitors are a Samsung SyncMaster 204B. The video card is a ASUS EN7600GT. The monitors have 1 DSUB I/O port and 1 VGA I/O port. *I've only ever used the DSUB I/O. The video card has two DSUB I/O ports. *Each one is connected to a monitor. As I mentioned in the OP, when the monitor is malfunctioning, I have swapped the DVI cables between the monitors. *When doing so, the malfunctioning monitor continues to malfunction while the other monitor (the one which has never malfunctioned) continues to function properly. *So from this, I believe the computer & video card are functioning properly. Am I making a valid assessment here? Is the PSU typically isolated from other circuitry in the monitor such that it can be replaced?- Hide quoted text - - Show quoted text - I don't have any suggestions, but it is definitely Not the backlight. With a fading backlight the picture would just get darker and darker, there would be no video reversal such as shown in the video. Are you connected to a Laptop ? is power saving kicking in an option available in your LCD if the battery is getting low? * Maybe we went over that already, I'm too tired to look back. No, this is one of my desktop monitors, and my desktop is not configured to sleep or hibernate. The second monitor which is connected to the same video card continues to function properly while the other malfunctions. So I don't think it's a problem of effect of the video card or computer. |
#16
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On Sun, 2 May 2010 07:22:40 -0700 (PDT), saber850
wrote: On May 2, 9:40*am, Meat Plow wrote: On Sun, 2 May 2010 08:21:04 +0100, "N_Cook" wrote: saber850 wrote in message ... Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available he http://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick Can you observe discrete jumps in the fade, ie stepped. Is it a backlight problem? if so perhaps find the brightness control line to the inverter and break there and add your own subcircuit perhaps. First monitor that line as maybe a fault inside the inverter chip What brand/model monitor? What brand/model card with NVidia chip? Does the monitor have a DSUB I/O? Does the video card have a DSUB I/O The symptoms don't describe an inverter problem to me but rather an LCD matrix drive, possibley PSU derived. Both monitors are a Samsung SyncMaster 204B. The video card is a ASUS EN7600GT. The monitors have 1 DSUB I/O port and 1 VGA I/O port. I've only ever used the DSUB I/O. The video card has two DSUB I/O ports. Each one is connected to a monitor. As I mentioned in the OP, when the monitor is malfunctioning, I have swapped the DVI cables between the monitors. When doing so, the malfunctioning monitor continues to malfunction while the other monitor (the one which has never malfunctioned) continues to function properly. So from this, I believe the computer & video card are functioning properly. Am I making a valid assessment here? Is the PSU typically isolated from other circuitry in the monitor such that it can be replaced? The problem indicates an problem with the video controller IN THE MONITOR. The Samsung 204s (and other Samsungs) have a bad reputation for this reason. A slow fade to white can be a problem with the power to the LCD panel itself, a fast fade to black can be caused by the inverter. A slow fade to black MUST originate from the video controler. Open up the monitor, using all applicable precautions. On the video controller should be several three terminal devices, but labeled with a U number (as a hypothetical example, U404). Those are voltage regulators. It is remotely possible that one of those may be putting out an incorrect voltage. The last two digits in the part number will be the output voltage. Again, a hyprtetical part number - L117N33B is a 3.3 volt regulator. PlainBill |
#17
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On Sun, 2 May 2010 07:22:40 -0700 (PDT), saber850
wrote: Both monitors are a Samsung SyncMaster 204B. Thank you for supplying the maker and model number. This might be of interest: http://pavel.kirkovsky.com/2009/03/samsung-syncmaster-204b-repair/ http://www.djhome.net/tips/samsungsyncmaster204T.htm I've seen both problems on the bench with similar Samsung models. My usual method is to replace *ALL* the large value electrolytic capacitors. The labour is less to do it at one time, than to spend any time finding which one or two is the culprit. Make sure you buy 105C or 125C replacement caps as the 85c variety don't last. Larger values and voltage ratings are fine, but watch out for package sizes and lead spacing. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#18
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On Sun, 02 May 2010 14:10:47 -0700, Jeff Liebermann wrote:
On Sun, 2 May 2010 07:22:40 -0700 (PDT), saber850 wrote: Both monitors are a Samsung SyncMaster 204B. Thank you for supplying the maker and model number. This might be of interest: http://pavel.kirkovsky.com/2009/03/samsung-syncmaster-204b-repair/ http://www.djhome.net/tips/samsungsyncmaster204T.htm I've seen both problems on the bench with similar Samsung models. My usual method is to replace *ALL* the large value electrolytic capacitors. The labour is less to do it at one time, than to spend any time finding which one or two is the culprit. Make sure you buy 105C or 125C replacement caps as the 85c variety don't last. Larger values and voltage ratings are fine, but watch out for package sizes and lead spacing. Agree with you, there's usually room to squeeze in higher voltage caps, and, with switching regs you could drop capacitance a little bit[1] and not harm the circuit performance -- ripple current rating of the caps is more important than the capacitance value of replacement cap. [1] Got some 390/63 and 820/25 105'C low ESR caps I'd use instead of 470/35 and 1000/16 in a repair. Grant. -- http://bugs.id.au/ |
#19
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
"Jeff Liebermann" wrote in message ... On Sun, 2 May 2010 07:22:40 -0700 (PDT), saber850 wrote: Both monitors are a Samsung SyncMaster 204B. Thank you for supplying the maker and model number. This might be of interest: http://pavel.kirkovsky.com/2009/03/samsung-syncmaster-204b-repair/ http://www.djhome.net/tips/samsungsyncmaster204T.htm I've seen both problems on the bench with similar Samsung models. My usual method is to replace *ALL* the large value electrolytic capacitors. The labour is less to do it at one time, than to spend any time finding which one or two is the culprit. Make sure you buy 105C or 125C replacement caps as the 85c variety don't last. Larger values and voltage ratings are fine, but watch out for package sizes and lead spacing. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 I was thinking capacitor too. In the old analog days one would searching for a leaky coupling cap in the video amplifiers |
#20
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 5:10*pm, Jeff Liebermann wrote:
On Sun, 2 May 2010 07:22:40 -0700 (PDT), saber850 wrote: Both monitors are a Samsung SyncMaster 204B. Thank you for supplying the maker and model number. This might be of interest: http://pavel.kirkovsky.com/2009/03/samsung-syncmaster-204b-repair/ http://www.djhome.net/tips/samsungsyncmaster204T.htm I've seen both problems on the bench with similar Samsung models. * My usual method is to replace *ALL* the large value electrolytic capacitors. *The labour is less to do it at one time, than to spend any time finding which one or two is the culprit. *Make sure you buy 105C or 125C replacement caps as the 85c variety don't last. *Larger values and voltage ratings are fine, but watch out for package sizes and lead spacing. -- Jeff Liebermann * * 150 Felker St #D * *http://www.LearnByDestroying.com Santa Cruz CA 95060http://802.11junk.com Skype: JeffLiebermann * * AE6KS * *831-336-2558 This is great info; thanks. The website links you found refer to the problem as "flickering". Is that the condition my monitor has, given the video I posted? |
#21
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On Sun, 2 May 2010 17:53:14 -0700 (PDT), saber850
wrote: On May 2, 5:10*pm, Jeff Liebermann wrote: This might be of interest: http://pavel.kirkovsky.com/2009/03/samsung-syncmaster-204b-repair/ http://www.djhome.net/tips/samsungsyncmaster204T.htm I've seen both problems on the bench with similar Samsung models. * This is great info; thanks. The website links you found refer to the problem as "flickering". Is that the condition my monitor has, given the video I posted? No, it's not the same. What's probably happening is that as your power supply warms up, the cazapitors are starting to also get hot. My guess(tm) is that the power supply output voltages drop, causing the odd changes to white and black. The symptoms of having the wrong power supply voltage vary radically with the type of circuit and which capacitors are a problem. I've seen flickering, fades, time delayed sudden failure, smoke, fire, and most commonly, just plain no picture. Given a specific single component failure, it's possible to predict the symptoms. Given multiple partial failures, it's at best a guess. Open up the monitor (it's a royal pain), replace all the big caps whether they look bad or not, and live happily ever after. If you're into being sure, I suggest you look into purchasing or building an ESR (equivalent series resistance) meter, as you're guaranteed to run into this problem in other devices that use electrolytics (motherboards, TV's, power supplies, monitors, game boxes, router, etc). I use mine far too often. http://www.ludens.cl/Electron/esr/esr.html http://www.anatekcorp.com/blueesr.htm http://www.flippers.com/esrktmtr.html (I have this one) http://www.midwestdevices.com/index.html More good reading on LCD repair: http://www.ccl-la.com/blog/index.php/category/monitor-repair/ Note how just about all the failures are electrolytic capacitors. Here's your Syncmaster 204 page: http://www.ccl-la.com/blog/index.php/samsung-214t-repair/ Note the they're symptoms include a "dark picture". Hmmmm... -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#22
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
As I mentioned in the OP, when the monitor is malfunctioning, I have
swapped the DVI cables between the monitors. When doing so, the malfunctioning monitor continues to malfunction while the other monitor (the one which has never malfunctioned) continues to function properly. So from this, I believe the computer & video card are functioning properly. Am I making a valid assessment here? Yes, of course -- that's Troubleshooting 101. What's going on is that the video information is being lost, and the pixel "twist" is being forced all the way one way, then all the way the other way. As to the cause... |
#23
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On Sun, 2 May 2010 14:14:33 -0700, "William Sommerwerck" wrote:
As I mentioned in the OP, when the monitor is malfunctioning, I have swapped the DVI cables between the monitors. When doing so, the malfunctioning monitor continues to malfunction while the other monitor (the one which has never malfunctioned) continues to function properly. So from this, I believe the computer & video card are functioning properly. Am I making a valid assessment here? Yes, of course -- that's Troubleshooting 101. What's going on is that the video information is being lost, and the pixel "twist" is being forced all the way one way, then all the way the other way. As to the cause... I like the 'crazy LCD controller' idea -- bad connection somewhere making it cycle through the brightness range -- doesn't seem like faulty components could make an LCD smoothly cycle brightness how you describe? So I think the culprit is the controller PCB in the LCD, unless bad power is provoking the thing to craziness? Grant. -- http://bugs.id.au/ |
#24
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
In article
s.com, saber850 writes As I mentioned in the OP, when the monitor is malfunctioning, I have swapped the DVI cables between the monitors. When doing so, the malfunctioning monitor continues to malfunction while the other monitor (the one which has never malfunctioned) continues to function properly. So from this, I believe the computer & video card are functioning properly. Am I making a valid assessment here? Yes. Sensible, logical fault-finding. Is the PSU typically isolated from other circuitry in the monitor such that it can be replaced? It depends on the specific monitor. Some have an external PSU brick, if yours are those then try swapping them over. If the PSU is internal it will probably be on its own board which can be removed and swapped out. How old is the monitor? -- (\__/) (='.'=) Bunny's thinking about giving Windows 7 (")_(") a go despite what he's said about it... |
#25
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 8:17*pm, Mike Tomlinson wrote:
In article s.com, saber850 writes As I mentioned in the OP, when the monitor is malfunctioning, I have swapped the DVI cables between the monitors. *When doing so, the malfunctioning monitor continues to malfunction while the other monitor (the one which has never malfunctioned) continues to function properly. *So from this, I believe the computer & video card are functioning properly. Am I making a valid assessment here? Yes. *Sensible, logical fault-finding. Is the PSU typically isolated from other circuitry in the monitor such that it can be replaced? It depends on the specific monitor. *Some have an external PSU brick, if yours are those then try swapping them over. *If the PSU is internal it will probably be on its own board which can be removed and swapped out. How old is the monitor? -- (\__/) * (='.'=) *Bunny's thinking about giving Windows 7 (")_(") *a go despite what he's said about it... This monitor does not have an external PSU brick; so I assume the PSU is internal. According to the following link, this monitor's power supply and inverter boards are integrated into one unit (http:// pavel.kirkovsky.com/2009/03/samsung-syncmaster-204b-repair/). I purchased the monitor new in 2007. |
#26
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
In article
..com, saber850 writes This monitor does not have an external PSU brick; so I assume the PSU is internal. According to the following link, this monitor's power supply and inverter boards are integrated into one unit Don't think so. The photos in your link show that the power board is separate. It would be unusual for the PSU and driver electronics to be integrated into a single board. It's also obvious that it's been designed down to the lowest price possible. (http:// pavel.kirkovsky.com/2009/03/samsung-syncmaster-204b-repair/). Ugh. The state of these caps. Samsung have skimped on the components and their users are now paying the price. Bad form. I purchased the monitor new in 2007. I suggest as a first step you do what the link above suggests and replace the few caps indicated, and see how it goes. -- (\__/) (='.'=) Bunny's thinking about giving Windows 7 (")_(") a go despite what he's said about it... |
#27
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 3:05*am, saber850 wrote:
Hi, My LCD desktop monitor has been exhibiting a problem for over 1 year. It is out of warranty and I would like to fix it. The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. The monitor does not exhibit the problem all the time. It comes and goes. I do not have a procedure which triggers the problem; it seems to be random. Sometimes it will behave this way for only a few minutes, while other times it will behave like this for weeks. I do not do anything to trigger the problem, other than have the monitor powered on. I have two of these monitors. I bought both monitors at the same time. Both monitors are connected to the same video card (nVidia) via a DVI connection. *Only one of the monitors exhibits the problem--the other continues to function properly. *When the monitor exhibits the problem, I can swap the DVI cables and the other monitor continues to function properly. So I do not believe the problem is my video card or computer. I do not know of a method to get the monitor out of this problem state. I've tried cycling the power to the monitor, and I've tried rebooting the computer. Neither method fixes the problem. The only thing I can do is wait for it to fix itself. But eventually, it malfunctions again. A video of the problem occurring is available hehttp://www.youtube.com/watch?v=W7YpFZVRjcE Best regards, Nick One thing I forgot to mention about the video is that it is not demonstrating the typical "end" of this problem. Typically, the monitor fades to all white, then to all black (as captured in the video), and that's it; it will stay black. It typically does not cycle the way it does in the video, at least not indefinitely. It may cycle several times, but within 1 and ~5 cycles (usually just 1 cycle), it will stay in the "black" state. |
#28
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
In article
s.com, saber850 writes The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. Erk. That video you put on Youtube is kinda creepy! Are you sure it's not demonic possession? I don't think it's a backlight problem. It looks more like a contrast issue. I have a similar Samsung monitor (SyncMaster 2343 widescreen) with touch controls and It looks like yours has those too. In your situation, the first thing I would do is whip the back off and disconnect the touch control board from the main board and see if the problem stops. I'm wondering if a "button" is stuck. Then I'd probably move to gently heating some of the chips, particularly those on the back of the LCD panel, with a hairdryer to see if the fault is temperature-related. I know you say you want to try and fix it, but if it's a panel fault, the monitor's fit only for scrap. -- (\__/) (='.'=) Bunny's thinking about giving Windows 7 (")_(") a go despite what he's said about it... |
#29
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 2, 8:13*pm, Mike Tomlinson wrote:
In article s.com, saber850 writes The problem is that the monitor displays the picture, and then gradually fades to white, and then gradually fades to black. Erk. *That video you put on Youtube is kinda creepy! *Are you sure it's not demonic possession? I don't think it's a backlight problem. *It looks more like a contrast issue. *I have a similar Samsung monitor (SyncMaster 2343 widescreen) with touch controls and It looks like yours has those too. *In your situation, the first thing I would do is whip the back off and disconnect the touch control board from the main board and see if the problem stops. *I'm wondering if a "button" is stuck. Then I'd probably move to gently heating some of the chips, particularly those on the back of the LCD panel, with a hairdryer to see if the fault is temperature-related. I know you say you want to try and fix it, but if it's a panel fault, the monitor's fit only for scrap. -- (\__/) * (='.'=) *Bunny's thinking about giving Windows 7 (")_(") *a go despite what he's said about it... Yeah, I was also a bit disturbed by the video when the picture's color inverts. I've changed my background so if I capture another video of the malfunctioning problem, it won't contain a person. If the problem were related to a "stuck" or "sticking" button on the face of the monitor, I'd expect the problem to exist all the time, or at least after I use the buttons. But neither is the case for me. The problem will start at a seemingly random time, and stop after a seemingly equally random duration. In particular, I rarely use the monitor's buttons except for power. I was also thinking about applying heat to the back of the monitor to see if that triggers the problem. If that triggers it, does that suggest a cold solder joint? Thanks for the info about the worth of the panel. |
#30
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
Hi, i'm new here and sorry 4 my poor english, first of all this long flame seems to me much
out of site (? exagerate..?), too much word maybe for a very simple problem, i'm not a tech but from the first agree with talks of J.Liebermann, the strange thing i spect from somone that suspected the main 5v line that ususally supply the graphic/video chip, so is not (for me) a bad idea to test the 5v line on the psu connector to the v.board since you don't found any bulged/ dirt capacitor, and if you find the v changes according to the fades then go to order caps, if not try at least to measure on the regulator on v.board to see if exit 3,3v fixed or some like it. I don't agree to what said, it's a luck that you have 2 equal monitor so in the last if you don't find culprit you can swap boards and see bye bye. |
#31
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
but from the first agree with talks of J.Liebermann, the strange thing i spect from somone that
sorry, i espected... i've made a jam.. the strange thing was: nobody has told to test 5v line.. suspected the main 5v line that ususally supply the graphic/video chip, so is not (for me) a bad idea to test the 5v line on the psu connector to the v.board since you don't found any bulged/ |
#32
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 7, 9:06*pm, "Dav.p." wrote:
Hi, i'm new here and sorry 4 my poor english, first of all this long flame seems to me much out of site (? exagerate..?), too much word maybe for a very simple problem, i'm not a tech but from the first agree with talks of *J.Liebermann, the strange thing i spect from somone that suspected the main 5v line that ususally supply the graphic/video chip, so is not (for me) a bad idea to test the 5v line on the psu connector to the v.board since you don't found any bulged/ dirt capacitor, and if you find the v changes according to the fades then go to order caps, if not try at least to measure on the regulator on v.board to see if exit 3,3v fixed or some like it. I don't agree to what said, it's a luck that you have 2 equal monitor so in the last if you don't find culprit you can swap boards and see bye bye. Yes, I've been considering swapping one of the boards between the monitors. This seems like the easiest way to narrow down the problem. |
#33
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
is also the last way, control first out voltages, if bad change caps
|
#34
Posted to sci.electronics.repair
|
|||
|
|||
LCD Desktop Monitor Fading to White, then Black
On May 9, 11:12*am, saber850 wrote:
On May 7, 9:06*pm, "Dav.p." wrote: Hi, i'm new here and sorry 4 my poor english, first of all this long flame seems to me much out of site (? exagerate..?), too much word maybe for a very simple problem, i'm not a tech but from the first agree with talks of *J.Liebermann, the strange thing i spect from somone that suspected the main 5v line that ususally supply the graphic/video chip, so is not (for me) a bad idea to test the 5v line on the psu connector to the v.board since you don't found any bulged/ dirt capacitor, and if you find the v changes according to the fades then go to order caps, if not try at least to measure on the regulator on v.board to see if exit 3,3v fixed or some like it. I don't agree to what said, it's a luck that you have 2 equal monitor so in the last if you don't find culprit you can swap boards and see bye bye. Yes, I've been considering swapping one of the boards between the monitors. *This seems like the easiest way to narrow down the problem. I swapped the power boards in the monitors. The "good" monitor immediately exhibited the problem that the previously malfunctioning one did, while the "bad" monitor works fine (at least, so far). So I'm confident that the problem is from the power board, and given this thread and some web sites, I'll start w/ the caps. Now that I had both power boards to examine, I also noticed that the C110 and C111 caps were replaced by Samsung when I sent the monitor in for repair earlier this year (the last month of its warranty). I'll get the specs of all caps today, find corresponding parts on DigiKey, and post back here for confirmation. I will research this topic on the web, but are the Polymer caps entirely superior to electrolyte ones? Are there drawbacks to polymer caps? |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
O/T: Our Childhood In Black And White | Woodworking | |||
Reuse notebook monitor with desktop | Electronics Repair | |||
HOT WHITE & HOT BLACK - HELP | Home Repair | |||
laptop tft monitor use with desktop ? | Electronics Repair | |||
Black and white photography | UK diy |