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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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Sony GDM-FW900 Monitor Brightness Problem
Hi All:
I was recently given a Sony GDM-FW900 widescreen monitor. It was in horrible condition as received. I went to great pains to clean up spilled beer and other vile stuff that was inside this monitor. To my suprise and delight, it actually powers up. However - There is a problem with it that I need help with . The screen is WAY over bright. Also, there are retrace ( term?) lines running diagonally down the screen about every two inches. It will display a windows desktop properly although out of focus a little bit. The additional brightness and lines are included with the desktop image. I would like to get this monitor running 100%. I can do some basic repairs myself, but will yield this job to a good tech if the required repair is highly specialized ( SM IC, reprogram, etc ). Can anybody help get me working in the right direction? Thanks for any replies. |
#2
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Sony GDM-FW900 Monitor Brightness Problem
On Mon, 23 Jan 2006 21:29:14 GMT, "Bob Kos"
wrote: Hi All: I was recently given a Sony GDM-FW900 widescreen monitor. It was in horrible condition as received. I went to great pains to clean up spilled beer and other vile stuff that was inside this monitor. To my suprise and delight, it actually powers up. However - There is a problem with it that I need help with . The screen is WAY over bright. Also, there are retrace ( term?) lines running diagonally down the screen about every two inches. It will display a windows desktop properly although out of focus a little bit. The additional brightness and lines are included with the desktop image. I would like to get this monitor running 100%. I can do some basic repairs myself, but will yield this job to a good tech if the required repair is highly specialized ( SM IC, reprogram, etc ). Can anybody help get me working in the right direction? Thanks for any replies. Is the Screen voltage set correctly? Tom |
#3
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Sony GDM-FW900 Monitor Brightness Problem
"Tom MacIntyre" wrote in message news Is the Screen voltage set correctly? Tom I don't know if the screen voltage is set correctly. I'm not familiar with that term. I presume that you are referring to the 'Focus' adjustments on the flyback? I carefully marked those and moved each a little to see if the condition got better or worsened. It didn't change much for better or worse, so I set them back where they were. |
#4
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Sony GDM-FW900 Monitor Brightness Problem
On Mon, 23 Jan 2006 22:51:42 GMT, "Bob Kos"
wrote: "Tom MacIntyre" wrote in message news Is the Screen voltage set correctly? Tom I don't know if the screen voltage is set correctly. I'm not familiar with that term. I presume that you are referring to the 'Focus' adjustments on the flyback? I carefully marked those and moved each a little to see if the condition got better or worsened. It didn't change much for better or worse, so I set them back where they were. No, the screen is different, usually on the flyback, but I think on Sony monitors there is special software you need to use. Tom |
#5
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Sony GDM-FW900 Monitor Brightness Problem
Look here! Dani.
http://www.hutzelman.com/home/hardware/mods/monitor/ There is a modification used on some Sony monitors, I have done it three times, with no problems. If your screen is too dark, then maybe your G2 is too low. try the "R459 fix"! Not sure if your model is the same. It's a 4 - 10 meg I think on the CRT board. You have to play around with the value, as the level of overall brightness varies. solder a 1 Megohm resistor piggyback on top of the one there sometimes works. |
#6
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Sony GDM-FW900 Monitor Brightness Problem
"Bob Kos" wrote in message k.net... Hi All: I was recently given a Sony GDM-FW900 widescreen monitor. It was in horrible condition as received. I went to great pains to clean up spilled beer and other vile stuff that was inside this monitor. To my suprise and delight, it actually powers up. However - There is a problem with it that I need help with . The screen is WAY over bright. Also, there are retrace ( term?) lines running diagonally down the screen about every two inches. It will display a windows desktop properly although out of focus a little bit. The additional brightness and lines are included with the desktop image. I would like to get this monitor running 100%. I can do some basic repairs myself, but will yield this job to a good tech if the required repair is highly specialized ( SM IC, reprogram, etc ). Can anybody help get me working in the right direction? Thanks for any replies. Problem solved. I found a setting in the menu system called 'Image Restore'. This setting doesn't work until the monitor has been on & stabilized for a while. I selected this menu option and the monitor went to work. It corrected the overbright condition and retrace lines on its own!! The colors are very nice now! I'm happy! Thanks to all who replied with help. |
#7
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Sony GDM-FW900 Monitor Brightness Problem
On Tue, 24 Jan 2006 02:54:07 GMT, "Bob Kos"
wrote: Problem solved. I found a setting in the menu system called 'Image Restore'. This setting doesn't work until the monitor has been on & stabilized for a while. I selected this menu option and the monitor went to work. It corrected the overbright condition and retrace lines on its own!! The colors are very nice now! I'm happy! Thanks to all who replied with help. I've fixed countless large Sony monitors with that. Andy Cuffe |
#8
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Sony GDM-FW900 Monitor Brightness Problem
"Andy Cuffe" wrote in message ... I've fixed countless large Sony monitors with that. Andy Cuffe Any idea what the actual purpose of this menu selection is? The fact that it fixed my monitor is great, but I can't imagine a menu setting designed to compensate for screwed up components or anything like that. The manual is quiet regarding the use of this option. Any thoughts? |
#9
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Sony GDM-FW900 Monitor Brightness Problem
On Tue, 24 Jan 2006 20:09:37 GMT, "Bob Kos"
wrote: Any idea what the actual purpose of this menu selection is? The fact that it fixed my monitor is great, but I can't imagine a menu setting designed to compensate for screwed up components or anything like that. The manual is quiet regarding the use of this option. Any thoughts? I believe it measures the CRT cathode current for each gun and adjusts them to the correct preset levels. It's similar to the AKB used in TVs, only it doesn't operate continuously. My only question is why the CRTs in these monitors get so much brighter with age. The monitors made before they added the restore feature required either a DAS calibration, or a modification to reduce the G2 voltage. There are also a lot of 21" Sony monitors with a restore feature that doesn't work. Andy Cuffe |
#10
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Sony GDM-FW900 Monitor Brightness Problem
"Andy Cuffe" wrote in message ... On Tue, 24 Jan 2006 20:09:37 GMT, "Bob Kos" wrote: Any idea what the actual purpose of this menu selection is? The fact that it fixed my monitor is great, but I can't imagine a menu setting designed to compensate for screwed up components or anything like that. The manual is quiet regarding the use of this option. Any thoughts? I believe it measures the CRT cathode current for each gun and adjusts them to the correct preset levels. It's similar to the AKB used in TVs, only it doesn't operate continuously. My only question is why the CRTs in these monitors get so much brighter with age. The monitors made before they added the restore feature required either a DAS calibration, or a modification to reduce the G2 voltage. There are also a lot of 21" Sony monitors with a restore feature that doesn't work. Andy Cuffe I'd like to try and find out more information as to how this feature should be PROPERLY used. If you know of any good sources of info, please send me in the right direction. I'll continue to Google on it. Thanks again. |
#11
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Sony GDM-FW900 Monitor Brightness Problem
On Fri, 27 Jan 2006 02:20:45 GMT, "Bob Kos"
wrote: I'd like to try and find out more information as to how this feature should be PROPERLY used. If you know of any good sources of info, please send me in the right direction. I'll continue to Google on it. Thanks again. Did you try the manual? I'm pretty sure all it's supposed to do is compensate for aging of the CRT and electronics. It allows the monitor to maintain accurate color reproduction over its entire life. Monitors without this feature gradually lose proper gray scale tracking and the guns age unevenly. Andy Cuffe |
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