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Question about BenQ FP71G 17" LCD Monitor

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BenQ FP71G+ Monitor is almost 2 years old, and while playing BF2142, monitor went black. nothing shows. light stays green when connected to a video device(tried it on both my desktop and my laptop to ensure it wasnt the vid card), and when not connected but powered on, green LED on front turns to brown, so it knows when it has signal. ive disassembled the monitor, and can provide pics of the cards(looks like there is a fuse built into the PCB with the power connection(right behind power connection) which looks blown(I think this is my problem), additionally, the item labeled T601 on the PCB with power plug(dont know what it is called... box thing with yellow tape all over it) shows some blacken marks on the yellow tape. Anyone know what that fuse is for, and does this sound like my problem?

Posted by Jason Fisher on

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  • Jason Fisher May 05, 2007

    ok, went and got a multi-meter, fuse reads good... but still wont display anything and power is on.

  • Iulian Dec 15, 2007

    At the beginning or in use, my LCD comes black. If I disconnect and connect again data cable or power cable, the image rise again, for one our or more. Image never re-comes if I use on/off taste. When screen black, power LED is green.

    Had you this problem? How did you resolve it?

  • Anonymous Dec 16, 2007

    My FP71G+ monitor went
    black. nothing shows. light stays green when connected to a video
    device(tried it on both my desktop and my laptop to ensure that video card was working , and when not connected but powered on, green LED on front
    turns to brown, so it knows when it has signal. Opened back panel and there are no visible signs of any components being burnt or damaged.

  • Anonymous Mar 01, 2009

    I have same prob. with monitor. Screen black, light green. after screws are removed, my case does not want to pop open easily. Any suggestions?

  • AzZerot Dec 13, 2009

    i have a problem with my Benq fp71g+
    last night i put it near a monitor with tube and it turn in green
    can anybody help me to get loose of that green?
    Thanks
    [email protected]

  • Anonymous May 11, 2010

    How did u guys manage to open the back panel of the monitor? I unscrewed 4 screws in each corner of the panel, and 1 screw right underneath the holder. Did i miss anything? My FP71G+ won't open... Thanks Spofer

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Anonymous

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We recently come across this problem - and like many others - looked online for a solution without much luck. So it was a clear case of fault finding. The symptoms of the indicator changing from amber to green on signal indicated a problem with the powersupply/inverter board, and not the smaller signals processing board, so that's where we started. On careful testing it soon became clear that the black picofuse (just above the main transformer) was blown. This indicated a major fault in the backlight driver circuit. There are two independant yet identical circuits that drive the backlights - this made testing easy. We found that the two driver transistors marked C5707 were almost completely shorted. You will identify these as being two of four identical black components with a built in heat sink at each end of a grey 0.22 Microfarad capacitor - looking much like bookends! Replacing these C5707 transistors with BD139 transistors (Note: these are constructed mirror image to the original transistors - fit them backwards to the original transistors !) and replacing the 3 Amp picofuse with a 1 ohm 1 watt resistor completely solved the problem ! - Colin Knight, Radtvid Electronics, South Africa.

Posted on Dec 31, 2008

Anonymous

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I have the same problem, I also openned the rear panel and examined the power pc board, there is definately burn marks on the board... not sure if it would be easier to order the main board from the company and re-install.. Also, could it be the smaller board I guess it would be a video pc board. Please let me know if you solve this problem. Thanks!

Posted on May 18, 2007

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Check the following: http://www.electronicrepairguide.com/benq-fp731-lcd-monitor-repair.html Seems a likely solution - however did not work for me, I have something else . . .

electronicrepairguide.com

benq fp731 lcd monitor repair

electronicrepairguide.com

How to repair Benq 17 FP731 LCD...

Posted on Sep 21, 2007

Samir Shah

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For display off problem definitely first culprit is Inverter board.If readily available replacement will solve the problem.

Posted on Feb 16, 2008

Anonymous

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Posted on Feb 13, 2008

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Look for shorted out transistors and cold solder joints, fuse in the inverter section.
See failed Dell monitors here.
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