Hey guys I have a Samsung 2043NW LCD that is showing some strange problems. When I set the monitor to 1600x1200 it works just fine apart from the lower resolution. No flicker at all. When I switch the setting to the recommended 1680x1050 it has a black screen with some strange bars and slowly bleeds to being completely black. I know that the computer and cable are fine because when I plug another monitor in and set it to 1680x1050 it works beautifully. I looked at the power supply board and none of the caps are bulged but I tried replacing them anyways with no results. When trying to display the high resolution, a high pitched whine can be heard from the thin board that runs along the entire top of the LCD panel.

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This is something I have never seen before. Any ideas on what would cause it to work fine in the resolution lower but not on the recommended resolution? I tried replacing the three caps and it still has the problem. The problem now seems to affect 1600x1200 as well. There were some test points on the thin board that runs along the top of the LCD. The test points were LP, POL, STH_F, STH_B, STV, CLKV, and OE.

The STV test point is the refresh rate because I get 59 - 60Hz when it is working. I can set the refresh rate to 75Hz and the test point will change as well. When I try to display a resolution that isn't working, the refresh rate drops down to 20Hz and will not change. Also, when the monitor is working the OE pin has a signal and when it isn't working the OE pin is stuck high. I have posted waveforms for the other pins as well because some of them are different when it isn't working too. 20Hz on one pin and no signal on another doesn't seem right to me.

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