Samsung 2043NW Strange Issue with High Resolutions

[canadaboy25]

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.

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?

Thanks

[budm]

Re: Samsung 2043NW Strange Issue with High Resolutions

I would try replacing those 3 lytics caps on the main board.
BTW, am I seeing brown stains on top of those lytics caps on the bottom right of the power supply board next to the white connector?.

[stj]

Re: Samsung 2043NW Strange Issue with High Resolutions

there are marks on ones without a vent, i think it's just marker pen.

i'd change them anyway though.

[canadaboy25]

Re: Samsung 2043NW Strange Issue with High Resolutions

Yeah it's just the marker they use at the factory. I'll change them and see what happens.

[canadaboy25]

Re: Samsung 2043NW Strange Issue with High Resolutions

Tried replacing all of the caps and the problem is exactly the same. When trying to display a high resolution I can hear a faint screeching coming from the circuit board that travels along the top of the LCD.