Question about Proview PL926WBi 19" LCD Monitor

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I have two proview lp917 that have the following problem: for 3 ~ 5 seconds after power on work normally (power on led green , back light on, no noise from power sullpy board). After that time: : Back light switch off, power light goes yellow and a hisss noise from power board. I have change all low voltage electrolytic capacitor without any success. Any idea?

Posted by Anonymous on

  • Louis Ebert Oct 18, 2010

    sangel129, Did you even look with a magnifing glass or low power inspection microscope (5x to 20x) to find any possible "hairline thin", "thermal-fractured" solder connections of the active and passive components that are soldered to the "switch-mode-power-supply/ccfl inverter circuit board? Pay particluar attention to the power transistors that drive the CCFL inverter ferrite transformers. 12fixlouie

  • Anonymous Nov 03, 2010

    Finally i found the time to examine these monitors a little bit more i found the problem.

    It seems to me that this is a cheap monitor, specially the fly tubes are very bad.

    The monitor is 3 years old and the problem is that they drown more current than normal.

    So the monitoring circuit suspend the operation of PWM IC (TL494). You can test the voltage at pin 1. Normal operation voltage , more than 2 volts, goes to 0.48V after 3 sec and the Back Panel lights go off.

    I cut the traces that feedback the error signal, and the monitor work now for 2.4 hours but with reduced intensity form back light.

    Thank you anyway

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5 Related Answers

Anonymous

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SOURCE: Proview PL926WSi LCD monitor will not power up

try testing the monitor on another computer.

Posted on Oct 25, 2007


computafixa

Alexander Selby

  • 317 Answers

SOURCE: Monitor goes blank less than a second after turning on.

Sounds like either there is a bad connection from the computer to the monitor, or the monitor has a faulty power regulator, causing the monitor to overheat prematurely, and shut off.

Posted on Feb 21, 2008

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Anonymous

  • 4 Answers

SOURCE: Preview 700 P

you should change al lthe caps in the PSU.. you can get them all from Maplins for a few pounds.
best get 105 centigrade ones

Posted on Nov 21, 2008

Anonymous

  • 1 Answer

SOURCE: Monitor screen remain black,power supply ok

Change monitor

Posted on Feb 04, 2009

Anonymous

  • 6 Answers

SOURCE: Proview 926 wbi monitor

There are online repair shop on eBay where you can send in your boards for repair. Just do a search on "PL926WBi" and you will find seller offering repair service. Sometimes its more then just replacing capacitor to resolve the problem.

Posted on Mar 21, 2009

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