Question about Proview PL926WBi 19" LCD Monitor

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Screen goes dark after a few seconds

Other posts indicate this is a common prob with this unit. I have replaced power board cap's c211 thru c217 and c12&13 .The only electrolitic's I haven't replaced are c201 (100uf/100v) and c22 which i have yet to determin the value of.
The problem remains I can now get it to stay on for 5 or 6 min. every now and then and the display is perfect but it goes dark then will only turn on for 4or 5 sec by looking close I can see that the display is still on but screen is dark.
Does anyone know where I can get a schematic this unit as it would aid trouble shooting greatly .
ALSO if you have any sugestions on how to correct this problem i would very much like to hear them thanks-gls1934

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  • Tribb Dec 23, 2008

    I have the same problem has one found out anything yet??

  • Vlace2005 Mar 27, 2009

    My monitor stays on for a good while at times and at other times it only stays on for a few secs.I can tell it is still on but it is black.I can turn it off and right back on and you can see it for a couple secs.then it goes black again.

  • jessejohn1 Apr 04, 2009

    I think that is the problem. I have a PL926Wbi, 19", 900W and it went partially dark, a bit pink warming up, started flickering, then 2 seconds and it goes black. Seems to be a bulb short out problem to me, proview support was not help, just wanted me to ship in and pay to fix it, wouldn't give me any ideas what it could be.

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I think you need new backlights, if it was the inverter or power supply (the same in this case), it would not come on for that long, even 4 or 5 seconds. This unit has four 2mm x 405mm ccfl bulbs (cold cathode fluorescent light) two on top and two on bottom which can act much like household fluorescent tubes, coming on only briefly or one bad one causing the others not to strike or to turn off with it. I haven't been able to find exact replacements yet but I have an email in to Proview parts. When I find a part number and price I will post it here. Also if there was a problem with your power supply board, especially capacators, you would most likely be able to see that.screen goes dark after a few seconds - 5b4a2c3.jpg

Posted on Feb 21, 2009

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This is a problem with the backlights i just replaced them with some backlights from a lcd tv that had broke. i had to modify the case a little but once its together you cant tell the difference. has been working for an hour so far.

Posted on May 10, 2009

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Sometime replacing capacitors MIGHT resolve these this problem.There an inverter I.C. chip "BIT3193G" which sometime goes bad. Also this unit is also known to have bad lamps. The lamps size is 2.6mm(D) x 414mm(L). If replacing capacitor didn't resolve the problem then you will need know electronics to fix the problem. I do repair on this board and offer my service on eBay.

Posted on Mar 21, 2009

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Capacitors are one part of the protection circuit there are transistors in the circuit that will may also need to be replaced they handle the switching for the lamps at high rates pushing high voltage by ac. if the unit is less than 10 years old the lamps are most likely not the problem.

Posted on Mar 21, 2009

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