Question about Dell E151FP 15" Active Matrix TFT LCD Monitor

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Dell LCD screen goes white

Screen now goes white immediately it the beginning it would go white after it was in use for a while. Now it is almost immediately. I have removed the cover from the back of the LCD panel. However I do not see any obvious signs of a component being bad....can someone direct me to the part that usually is the issue? I have two fo these monitors currently with this problem. Unfortunately I have several of these in use and I am concerned they too will start having the same problem.

thanks in advance for any help I have the same problem. When my monitor comes on it is all white and stays that way. I have connected it to a different computor and the problem is still there. I'm looking for a higher technical explanation of the problem. I have a Dell 15" LCD that I just got from someone on Freecycle. It practically seems like some kind of RPG (game) where you just keep levelling up to more and more difficult problems. Past monitors have had obvious damage, a blown inverter, power board, etc., but this is a stumper.

It doesn't always start up white. And out of nowhere it'll just fully kick in and out... suddenly BAM, all white. Then I can just leave it on white for a while, and it'll go back to the normal screen. No amount of powering-on-and-off will convince it otherwise. No bashing it upside the head. Nothing is overheating either. It's got no rhyme or reason... it'll do it cold, warm, been on for hours or just minutes. It'll just go all white all of a sudden.

I sort of guess bad capacitors since that seems to always fix my electronics quirks (like the "close cover" error on the LaserJet IIP caused by a bad capacitor on the density control PCB). But is there anyone that can put a more direct finger on the problem?

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  • Matt Falcon
    Matt Falcon Dec 29, 2008

    Wow, uh... fixya fails MISERABLY at formatting. I didn't write all that, I just added a comment. My comment begins in paragraph #2 at "I'm looking for a higher technical explanation of the problem".

  • Matt Falcon
    Matt Falcon Dec 29, 2008

    A VGA cable would make the screen go white? All-white means the LCD integrated circuits aren't getting power or signal from the controller logic, presumably that the controller logic became locked up or jammed. Don't see how that could be the VGA cable - or inverter board either for that matter, since the inverter board is what would make the screen dark, not light ;)

    That only leaves the power supply, which appears to be working fine. Switching power supplies have a feedback-loop circuit that either put out "good power", or they just don't work at all, the only possible problem could be "dirty power" from dead capacitors, which I can't test for without having a scopemeter or oscilloscope (a tool high on my to-get list, right next to a capacitance meter).

    But thanks for the reply!


  • Matt Falcon
    Matt Falcon May 31, 2009

    After all this time, I finally found the cause, and hence the solution! There is a poorly soldered component on the power board (I didn't even think to check the power board). I had tried everything else... sanding down (with ultra fine grit paper to remove corrosion) the connector cables, pressing them harder, testing the logic IC for cold solders, everything! I finally decided to try "tapping around" on the board (since banging it across the top would fix it for a while) and locating the tap-sensitive part. I found that a swift (but not very hard) whack on the logic IC made it spring back to life, so I was "getting warm". Nothing I would tap on the LCD panel's components would make it work, so those were OK...

    It wasn't until I started tapping around on components of the power board that I found the exact component with the faulty solder joint. I tapped the area of the circled component (below) very lightly, and it would work great! Voila. I took out the power board, and found that one of the two leads on that component was sliding in and out of its hole (totally loose). That's why bashing it across the top worked (the component is near the top of the monitor). Soldered it back down and it works flawlessly - tapping it no longer causes the screen to go white.



    Who'd've thought it was a faulty solder on the power PCB?


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The problem with most LCD monitors that go white are one or more of the following in order:

1. Bad or loose VGA/DVI connection cable
2. Bad power inverter board. (Internal part: can be replaced)
3. Bad power supply.

Hope this helps you.

Posted on Dec 29, 2008

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