BenQ FP71G 17" LCD Monitor Logo
Randy Gui Posted on Nov 20, 2006
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Monitor goes blank automatically after about 40 minutes...

I bought this monitor about a year ago and has been working fine till last week. One day, my monitor just go blank. I thought it was nothing so I turn off my computer. But the next time I used it, it goes blank again after about 40 minutes. Rebooting my CPU won't help as monitor goes blank soon right after logging into Windows (I'm using XP Pro). I thought it was driver malfunction(Vga card nVidia 6600), so I re-installed with the lastest driver, but to no avail. The only solution I have at the moment is to turn the monitor off for quite some time before using for another 40 minutes. By the way, rebooting my monitor allows me 1 second before it goes blank again. Another thing, after I turn off my CPU but left the monitor running, it shows; and to burn-in OFF It's very frustating. Please help.

  • Anonymous Apr 07, 2008

    I have an nvidia 6600 gt also, and I have exactly the same problem. Sometimes it simply changes resolution to an inexistant one and if I'm lucky I can see enough to revert it. But really, usually it just goes black and I can't do anything...sucks.

  • Anonymous Apr 15, 2008

    my monit goes blank after about 30 minutes . I have to shut down to bring it back up. Cannot clt/alt/ delt

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  • Posted on Nov 26, 2006
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Hi Randygui, Sounds like the back light inverter board is bad. It's a very common problem. LCD's use four small cold compact fluorescent bulbs to back light the display. (thats what gives the LCD it's brightness allowing you to see it) The inverter board runs these lights and when they go bad they will typically show symptoms like you have or the monitor power light comes on and you have either no display or a very dim display. If you ever have one that has no display but the power light is on you can check by shining a flashlight directly into the LCD from the front (right into the screen) if you can see an image then it's either the inverter board (most likely) or the CCFL bulbs have gone bad. The inverter board and CCFL's are replaceable. Good Luck, El Duderino

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  • Posted on Mar 30, 2008
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Click on Start --> Settings --> Control Panel
Select the Power Options
In that choose the power schemes and in the down you will have the four combo box.
For each options in the power schemes choose the "Never" options in the four combo boxes.

Let me know if your problem is solved and rate me as FIXYA!

A

Anonymous

I'm having the same issue, and theres a loud high pitch squeal every time the screen goes black

Samir Shah

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  • Posted on Mar 10, 2008
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If the transistors C5707 were defctive check PF801 yellow colour near heatsink in power section.It's a 3A fuse slow Blo.
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My dell laptop is not working on batteries.. can u suggest a suitable power option to get the backup

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Any links to a source for a replacement board? I'm having a devil of a time finding one.

Actually we were thinking of repairing the board I have... we have the board out and have identified the likely transistors (C5707) and have micro-soldering capability. But wondering about possible fuses that we can't ID... (not the power supply fuse)... are there fuses for each of the lamp transformers? Any source for schematics?

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