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Dell 19" LCD Monitor, Charcoal-Gray in color, released in 2004.

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Display darked out in 1 second

My Dell has very similar board layout as this one. It display for about 1 second after each power on and then darked out. Power off and on again give me another second but that's is. I shine a strong light on the screen in the hope that I can see a shadow of the display but nothing. With help from this site, I tear down the case but not able to troubleshoot because of my limited knowledge.

With the power supply board alone (not connect to any other board), tested it and all +5V and +12V output are ok and very stable. Found a pin labled "on/off along the DC out to the controller board (i.e. the one with the VGA port). But no matter I connect ground or +5V to it, the inverter still has nothing out.

Can anybody give me an idea how I can troubleshoot the problem? Thanks in advance.

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senderj, sounds like a bad inverter. You can try to recap the PSU or replace it.

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senderj será eternamente grato(a).
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