Dell E151FP ~ Blues/Greens come & go

[alegro]

When I got this Dell E151FP LCD (used) all the colors were fine. Now the blues and greens are out most of the time, leaving only reds. But some times the blues come back in for a few minutes or hours. And sometimes all three colors are working.

Is there possibly a loose connection or something? I've never had a monitor that did this before.

[retiredcaps]

Re: Dell E151FP ~ Blues/Greens come & go

Is there possibly a loose connection or something? I've never had a monitor that did this before.

I suggest taking it apart and seeing if you have any visibly bad caps on the boards. If you need more help,

edit: Post clear focused pictures (top down, both sides - all boards) after reading

https://www.badcaps.net/forum/showthread.php?t=1868

[alegro]

Re: Dell E151FP ~ Blues/Greens come & go

photos of boards

[retiredcaps]

Re: Dell E151FP ~ Blues/Greens come & go

photos of boards

See

https://www.badcaps.net/forum/showth...&highlight=cmv

for what I mean by top down, both sides.

You will get better pics if you take the boards to a window on a sunny day and put your camera on macro mode.

[retiredcaps]

Re: Dell E151FP ~ Blues/Greens come & go

Now the blues and greens are out most of the time, leaving only reds. But some times the blues come back in for a few minutes or hours. And sometimes all three colors are working.

Try running this with a fan blowing on the back to cool it down. If that works for a few days, then you know something is overheating. This could be bad/poor solder joints or a chip overheating.

[alegro]

Re: Dell E151FP ~ Blues/Greens come & go

I don't think heat is an issue. Its usually all red when I turn it on, and then the other two colors may or may not come on during the time that the monitor is on.

[retiredcaps]

Re: Dell E151FP ~ Blues/Greens come & go

I don't think heat is an issue. Its usually all red when I turn it on, and then the other two colors may or may not come on during the time that the monitor is on.

Red or pink is usually a possible sign that the one or more of the CCFLs are dying.

How old is this monitor and how much is it used?

edit: Or the main video logic chip is dying. See

https://www.badcaps.net/forum/showth...ng+red&page=10

[jetadm123]

Re: Dell E151FP ~ Blues/Greens come & go

With the monitor off, have you tried reseating the cable(s) on the logic/video boards at both ends?

[jetadm123]

Re: Dell E151FP ~ Blues/Greens come & go

Upon further examination, it looks like the power board was recapped with general purpose caps instead of low-esr ones. The Nichicons are general purpose VR series rated at 85 deg C. The green Lelons are RGA series, which I believe are also general purpose. Maybe a potential cause of the problem?