Question about AOC LM929 (Black) 19" LCD Monitor

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Power Monitor is only a year old and the power just suddenly went out. I tried it on another computer with no luck. It is just dead. Any suggestions?

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  • lilstinker Sep 18, 2007

    It is an AOC 19" LCD LM929 model

  • Matt Falcon
    Matt Falcon Apr 16, 2008

    Picked up a LM929 that also has a similar power problem, but it's lasted longer (about 3 years, so they say).

    The fuse on the power control board was totally shot. Thinking it was the result of a surge or some other anomaly, I tested it (probably not the best way) by shorting the fuse. That resulted in a releasing of the magic smoke and a small light show. I blew a trace on the power PCB.

    After I brought the monitor home, I tore it apart and took my multimeter to it. The transistor mounted on the single heatsink (not the one with two transistors mounted to it) was fully shorted, 0 ohms all around. I did some research on that chip and found that, while it's out of production, it should be replaceable with:http://www.mouser.com/Search/ProductDeta... - a STF9NK60ZD. I have two on order in case I foul up the first one.

    Meanwhile, I searched around and yanked a similar (but far out of spec and way too cheesy to work properly) MOSFET chip from a dead PC power supply I had laying around. I soldered that into place and gave it a try. Well, no more earth-shattering kaboom (actually, it now gives the typical "snap"), but it still doesn't work. I think the chip is putting out the wrong levels to work properly. I'll have to wait for the new chip to come in to see if that fixed it.

    I also found a couple bloated capacitors on the board - maybe AOC is using cheap **** capacitors that may be to blame for other problems...

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Check the power pack to see if it has the required output voltage, usually 12-15 volts. solidstate power packs are prone to failure. The LCD screens require between 2 and 4 amps to power them. A strain on some power packs. Gary(Honkity Hank)

Posted on Sep 18, 2007

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