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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. |
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#1
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TFT monitor repair tips
Hello,
Can anyone point me towards some websites which can be of help when dealing with lcd monitor repair. Schematics, panel reference lists, repair tips, troubleshooting... Any help would be welcome as google wasn't so helpful. Cheetah |
#2
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TFT monitor repair tips
I don't want to dissapoint you, but component level service for the LCD and Plasma display's are not normaly supported by any of the manufactures. They are mainly serviced at the module level only, as like servicing a PC computer. After warranty, they are usualy considered not feasible to service, unless the fault is something simple. Full service manuals for many of these types of displays are usualy difficult or impossible to obtain. After the warranty periods for most of this type of technology is finished, spare modules and parts may not be available unless you can find a scapper unit with good parts. The exception is if you can find some generic parts that will work. When factering in the cost of the circuit boards and the laour, the dropping of the replacement cost, after warranty service is usualy considered not worth the cost. When troubleshooting and servicing this type of technology the tools, and instruntation required is fairly expensive. If you want to service these types of monitors, try to see if you can negotiate warrenty contract with some of the manufactures. Be prepaired to invest a fair amount of dollars to get going with this. Jerry G. On Aug 17, 1:55 pm, CheetahHugger wrote: Hello, Can anyone point me towards some websites which can be of help when dealing with lcd monitor repair. Schematics, panel reference lists, repair tips, troubleshooting... Any help would be welcome as google wasn't so helpful. Cheetah |
#3
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TFT monitor repair tips
"CheetahHugger" wrote in message . .. Hello, Can anyone point me towards some websites which can be of help when dealing with lcd monitor repair. Schematics, panel reference lists, repair tips, troubleshooting... Any help would be welcome as google wasn't so helpful. Cheetah There's two fairly common problems with these which I've had good luck repairing. One is the backlight CCFL tubes and inverter, and the other is the power supply. Both of these areas can be fixed using basic troubleshooting with little flat panel specific knowledge. |
#4
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TFT monitor repair tips
This is what i am looking for, especially tips and tricks engarding
those inverters. As well any other tips, i don't wish to service the mainboard but am sure that i can do a little more then just looking for a smashed identical screen and swap the board. Cheetah |
#5
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TFT monitor repair tips
On Aug 17, 8:54 pm, "Jerry G." wrote:
I don't want to dissapoint you, but component levelservicefor the LCD and Plasma display's are not normaly supported by any of the manufactures. They are mainly serviced at the module level only, as like servicing a PC computer. After warranty, they are usualy considered not feasible toservice, unless the fault is something simple. http://www.justmanuals.com Fullservicemanualsfor many of these types of displays are usualy difficult or impossible to obtain. After the warranty periods for most of this type of technology is finished, spare modules and parts may not be available unless you can find a scapper unit with good parts. The exception is if you can find some generic parts that will work. When factering in the cost of the circuit boards and the laour, the dropping of the replacement cost, after warrantyserviceis usualy considered not worth the cost. When troubleshooting and servicing this type of technology the tools, and instruntation required is fairly expensive. If you want toservicethese types of monitors, try to see if you can negotiate warrenty contract with some of the manufactures. Be prepaired to invest a fair amount of dollars to get going with this. Jerry G. On Aug 17, 1:55 pm, CheetahHugger wrote: Hello, Can anyone point me towards some websites which can be of help when dealing with lcd monitor repair. Schematics, panel reference lists, repair tips, troubleshooting... Any help would be welcome as google wasn't so helpful. Cheetah |
#6
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TFT monitor repair tips
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#7
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TFT monitor repair tips
CheetahHugger wrote:
http://www.justm*************** Did I ask for spam? Regular, Low Sodium, or Turkey? -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#8
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TFT monitor repair tips
Regular, Low Sodium, or Turkey? Regular please, with a pepsi! Cheetah |
#9
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TFT monitor repair tips
CheetahHugger wrote:
Regular, Low Sodium, or Turkey? Regular please, with a pepsi! Cheetah No Pepsi! Mountain Dew!!! -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#10
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TFT monitor repair tips
On Fri, 17 Aug 2007 17:55:58 GMT, CheetahHugger
wrote: Hello, Can anyone point me towards some websites which can be of help when dealing with lcd monitor repair. Schematics, panel reference lists, repair tips, troubleshooting... Any help would be welcome as google wasn't so helpful. Cheetah At least 8 out of 10 LCD monitors I see have power supply, or back light inverter problems. The most common power supply problem is defective caps. Poor quality caps are finding their way into everything now. The bad ones will have the tops bulging out, but it's usually best to replace them all if a few are bad. The inverters are more complicated to fix. Any number of things can go wrong. I see bad transformers, shorted transistors, shorted diodes, and bad caps. No schematics are available and the SMD components are often not marked in any meaningful way. I have repaired a lot of them, but it often requires doing a lot of research to ID parts. Once thing you can check is the tiny surface mount fuse on the inverter board. When they are blown, about half the time there's nothing else wrong. Fortunately, the inverter is the one board that can sometimes be replaced for a reasonable price. Andy Cuffe |
#11
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TFT monitor repair tips
No Pepsi! Mountain Dew!!! Mountain dew cheetah? LOL Cheetah |
#12
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TFT monitor repair tips
Andy Cuffe schreef:
On Fri, 17 Aug 2007 17:55:58 GMT, CheetahHugger wrote: Hello, Can anyone point me towards some websites which can be of help when dealing with lcd monitor repair. Schematics, panel reference lists, repair tips, troubleshooting... Any help would be welcome as google wasn't so helpful. Cheetah At least 8 out of 10 LCD monitors I see have power supply, or back light inverter problems. The most common power supply problem is defective caps. Poor quality caps are finding their way into everything now. The bad ones will have the tops bulging out, but it's usually best to replace them all if a few are bad. The inverters are more complicated to fix. Any number of things can go wrong. I see bad transformers, shorted transistors, shorted diodes, and bad caps. No schematics are available and the SMD components are often not marked in any meaningful way. I have repaired a lot of them, but it often requires doing a lot of research to ID parts. Once thing you can check is the tiny surface mount fuse on the inverter board. When they are blown, about half the time there's nothing else wrong. Fortunately, the inverter is the one board that can sometimes be replaced for a reasonable price. Andy Cuffe Yes, this is what i found out as well, seems we are conned as usual with bad quality caps. Cheetah |
#13
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TFT monitor repair tips
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#14
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TFT monitor repair tips
Either that's a spampage or it doesn't work. Cheetah |
#15
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TFT monitor repair tips
On Aug 18, 1:22 am, "James Sweet" wrote:
"CheetahHugger" wrote: Can anyone point me towards some websites which can be of help when dealing with lcd monitor repair. Schematics, panel reference lists, repair tips, troubleshooting... Any help would be welcome as google wasn't so helpful. There's two fairly common problems with these which I've had good luck repairing. One is the backlight CCFL tubes and inverter, and the other is the power supply. Both of these areas can be fixed using basic troubleshooting with little flat panel specific knowledge. How do you isolate a CCFL/inverter problem without swapping parts? I have a panel with a backlight that goes out about two seconds after power on. Transistor/diode junctions all look OK, no visible cap problems, tubes have no telltale black bands. Shorted transformer winding, perhaps? How to test for that? Thanks, TM |
#16
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TFT monitor repair tips
How do you isolate a CCFL/inverter problem without swapping parts? I have a panel with a backlight that goes out about two seconds after power on. Transistor/diode junctions all look OK, no visible cap problems, tubes have no telltale black bands. Shorted transformer winding, perhaps? How to test for that? I have a few lamps and inverters that are not in monitors, it's pretty easy to wire one or the other up for testing without tearing things apart too much. |
#17
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TFT monitor repair tips
I use a scanner lamp driver to test individual lamps in the screen.
Yesterday i fixed an inverter that was shutting down, it had a shorted diode and a damn small one. Cap problems are not always visible, i use the atlas esr60 meter and it tells me a lot of caps simply go high esr but don't bulge. Cheetah |
#18
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TFT monitor repair tips
On Aug 20, 12:01 am, Andy Cuffe wrote:
The inverters are more complicated to fix. Any number of things can go wrong. I see bad transformers, shorted transistors, shorted diodes, and bad caps. No schematics are available and the SMD components are often not marked in any meaningful way. I have repaired a lot of them, but it often requires doing a lot of research to ID parts. Along those lines, I have a Sampo QPWBGL993IDLD inverter with a bad transistor (Q8, one of two that drive the transformer windings). It's an SC-62/MPT3 package, with 'CF', 'Å', and 'RT' markings. After much online research, I identified two possible devices that this could be: Sanyo 2SC3650 NPN, 25V, 1.2A (hFE = 1500 typ) http://www.ortodoxism.ro/datasheets/..._e/2SC3650.pdf or Rohm 2SD2150 NPN, 20V, 3A (hFE = 180-390) http://datasheets.ru/datasheets/1078...a-2SD2150.html Which one is it (or is it some other transistor)? Thanks, TM |
#19
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TFT monitor repair tips
On Aug 17, 1:55 pm, CheetahHugger wrote:
Hello, Can anyone point me towards some websites which can be of help when dealing with lcd monitor repair. Schematics, panel reference lists, repair tips, troubleshooting... Any help would be welcome as google wasn't so helpful. Cheetah http://www.justmanuals.com |
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