Question about BenQ FP731 17" LCD Monitor

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Monitor displays breifly then goes to blank screen

Hi, Whenever I turn on my monitor it displays the computers output briefly (~half a second) before going blank. I have tried the monitor on two other computers with the same result so it is definetaly not a computer problem. The power light on the front of the monitor stays green when the screen goes blank. Whenever I turn the power off and back on again the exact same thing happens. Help please!! If i switch on the system with in one or two seconds the monitor goes blank. but the power light of the monitor remains green. if i switch off the monitor and switch it on again the display comes and vanishes with in two seconds.

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  • andreascyp Jan 10, 2008

    I have the same problem...I dont know what to do...

    pls help

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8 Answers

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The green power light indicates that the monitor is receiving from the computer correctly. I suspect it is going into high voltage shutdown. There is a safety circuit that monitors the high voltage and shuts the monitor down if it sees anything amiss. So the monitor comes on and then shuts off. High voltage problems are generally not worth trying to repair. Another example of a worthless safety feature. High voltage failures are not dangerous, and adding the safety circuit just kills the unit when it may have some life left or worse, sometimes it is the shutdown circuit itself which fails!
Hope this helps.

Posted on Jan 10, 2008

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I gave my FP731 to my brother thinking that my PC was the culprit and bough myself a new system. He told me he had the same problem on his system. He brought it to students in PC repair and had it opened. They found out that it was a set of wires that were being crushed by the monitor housing. They carefully put the wires back at their place and the monitor is functinning well now. Hope this helps.

Posted on Oct 06, 2008

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Same problem here with a BenQ 15" panel, the fault lies with the inverter section driving the CCFL tubes for the backlight (as the image can still be seen on the LCD panel itself).

There isn't a 'consumer' fix for the problem, it's either get an entirely new inverter board or pull out the soldering iron or hotair-reflow gun to do the job... quite probably it'll need replacement parts (output drive transistors or possibly a faulty load sensor).

Posted on Aug 08, 2008

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I had same problem, same moniter seriees, as suggested get benq to fix it... they did mine in 2 days with no reciept, theyll even pick it up 4 u and bring back afta. mine was 2 years old.

Posted on Jul 24, 2008

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Is this a BenQ 731?
If so check inverter transistors on power/inverter board.The transistors and inverter transformers are generally dry,Resolder them.
Samir

Posted on Feb 27, 2008

  • Samir  Shah
    Samir Shah Mar 10, 2008

    BenQ has a 3 year warranty on LCD monitors.Please check out BenQ Support on www.benq.com. for local contact details.

    Samir

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Hi, I have the same problem, I have also tried with differents OS with out any improvement. What I do now and works is when the monitor is working I play a video/movie and let it run in the background with muted sound, I works good, never turns blank whit this trick,I Use Totem player on Ubuntu (Linux), but it might work with other players and platforms.

Posted on Feb 25, 2008

I have the same problem, what I am doing is, when I come from work just turn on and off the moniter few time, during the on period ( when I can see the screen) I go to windows shut down screen when windows XP goes black and white. Moniter stays on on that screen. when the black and white screen stays for 4 / 5 min I cancel the shut down process and the monter work fine upto 4 / 5 hours.

Posted on Jan 16, 2008

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Sounds like there is a problem with the RGB Decoder.  What that means is that the monitor is not decoding the sinal properly. which explains why it comes up for a split second, and then goes blank.  I would suggest trying a different monitor connection like DVI or HDMI if you have it, otherwise it sound like the monitor is defective

Posted on Jan 10, 2008

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