Originally Posted by Craigaaa
First thing I would check is the LED driver board if you have REV 00 contact a reseller and get the new REV board. Look for discoloration on the back of the PCB and at the mosfet. If it passes the visual inspection then I would test the output of your power supply. It should be 23.6Vdc +/- 10%. If it tests as good then I would check and make sure the LVDS video cable is plugged in properly at the panel and at the video board output. Also make sure that each pin is properly locked into the connector housings. I have seen LVDS cables get unplugged slightly either by vibrations or simply dropping the monitor. This can cause the panel to flicker since the low voltage signals have a intermittent contact. Also it can cause video issues(noise) where there are artifacts and improper pixel colors. There's really no way to test the video board without having another one on hand to swap in. The only thing I can think of is doing a visual inspection on all input and output cables making sure they are all properly seated and plugged in. You could test each cable with a multimeter to make sure the wires are crimped correctly and you could use it to test the dc output of the led driver board.
If there was something wrong with the backlight, why would there sometimes be image distortions?
Power supply: 24.9 Vdc
LED driver board DC output: 25.0 Vdc (tested the pins where the backlight connector should be)
None of the PCB's looks discolored.
The cables all look neat and properly connected. I only tested the cable between the LED-driver board and the video board though; I found it quite hard to remove the LVDS cable.
Thanks again for your help, anything more I could check before screwing this thing back together?Edited by todda7 - 6/2/13 at 7:46am