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.
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
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.
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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
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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