Dell 2405fpw with black, scrambled, or yellow screen

[AviatorDave]

Started with screen just being black. Backlight was still functioning as I could see it change when it was turned off. The first few times, I could turn it off, then back on again and it would work. The final time, it would show random black and white stripes that flickered in horizontal and vertical directions, then would go back to black. Last week after leaving it on, the screen came back on just with the test pattern (it was no longer connected to a computer), but the background was yellow, not black. This morning it is back to black. It will power on and off, sometimes it shows the white stripes again, but just goes back to black. The backlight still works as if I tap the top of the bezel, or tap the panel, it will flicker with a white light. And when it is turned off, the entire display becomes a darker black.

Attached is what it looked like Friday when it was the yellow color.

The power board on my 2407 went out recently, but when it did, not even the power button would light up. But I guess this one could still have a bad power board. I did take the cover off and didn't see any obviously blown caps like the 2407 had.

Which board is most likely the culprit for this condition?

Thanks

[AviatorDave]

Re: Dell 2405fpw with black, scrambled, or yellow screen

Anyone?

[Lumberjack777]

Re: Dell 2405fpw with black, scrambled, or yellow screen

Which board is most likely the culprit for this condition?

Most likely that is main (logic) board.

Can you post some high quality pics, front and back for us.

[AviatorDave]

Re: Dell 2405fpw with black, scrambled, or yellow screen

High quality pics of the main board?

[Davi.p]

Re: Dell 2405fpw with black, scrambled, or yellow screen

Does the spontaneous show of the test pattern is normal in this type of monitor?

[AviatorDave]

Re: Dell 2405fpw with black, scrambled, or yellow screen

Does the spontaneous show of the test pattern is normal in this type of monitor?

Yes, when no video cable is connected, it displays the test pattern. But it should be on a black background.

[bammbammfran]

Re: Dell 2405fpw with black, scrambled, or yellow screen

is there a controller board on the back and near the top of the screen. It is usually under a small silverish tin cover and held on with maybe 4 screws.

If it has more than video one input, does it do this on the other input too ?

[bammbammfran]

Re: Dell 2405fpw with black, scrambled, or yellow screen

boards
Power board will probably look like the one in picture 1
This one pictured has all bdd capacitors at the bottom right of the picture so this could be a common issue (you can see the bad caps have rounding tops)

Second picture shows a main board
If your power supply looks ok
and you have a dc voltage tester, check the pins between the two boards for voltage.
If 5 volts is on one of those pins when the unit is powered off.

These are other peoples pictures, so actual pictures of both sides of the board would help.
3rd picture shows a controller board from a different model 24" dell and is only to show what a controller board looks like
then check the large tabs of the two components shown with yellow arrows