Question about BenQ FP72G+ 17" LCD Monitor

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BenQ FP72G 17" LCD Monitor NO DISPLAY

I've replaced 1 X 2SC5707 (Q808)
I've also replaced 1 X FU9024N (HexFET Power MOSFET)(Q805)

re-soldered all the legs of the 4 transformers

but still not working, NO DISPLAY,

it's even worst this time, when i shine a torch on the screen, no dim display at all ???

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Definetly, you can solve this problem with changing one or more defective 2SC5707,check all invertors and signal flat cables, but also check the fuse on board ../fp751 btw..3A-250V/

Posted on Oct 29, 2009

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Check the ribbon from the video card to the back of the panel. It has to be aligned perfectly and locked down in the right position at the video card side, and pushed in corrctly to the panel.

The section that contains the inverter circuit is totally seperate from the rest of the power supply. Seperated by the fuse link marked FBxxx.

Posted on Apr 22, 2008

  • Peter Thompson
    Peter Thompson Apr 22, 2008

    If you understand what to stay clear of, then check the voltage on either side of that fuse link with the unit on and connected to a running video source.



    If your not familiar with it, then do the original test using continuity on the MM without power being applied. It has to have full tone for 10+ seconds. That fuse supplies the power to the inverter and should be between 18-23v with no load.

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I came across a common fault problem in BenQ 17′ LCD Monitor. The problem is have power but no display. Once you has opened the LCD cover, check the pico fuse for open circuit (very common), the push pull transistors C5707 for short circuit and the Buck royer circuit p-channel fet FQU11P06 also for short circuit too. For your information, if you can't get the FQU11p06 you can always use FU9024N as a replacement. Resolder all the high voltage transformer pins and replace the components above and I'm sure you will bring back the life of this BenQ 17′ LCD Monitor.
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The way the circuit works is in a mirror format. There are 2 identical circuits that go to each end of the board.

Be sure to check that fuse for continuity, not just for a second like you normally would, but hold it for a good 10 seconds.
Also don't forget while you are in there it's best to repolace it anyway with an actual fuse. A 3A slow blow ceramic is good for this.
Check the 4 transformers as well, if you notice the top circuit is the faulty one, then check the transformers at the top. The transistors are quite powerful, and normally need something to trigger them into failing. Do the same for the bottom circuit.

This monitor came in 2 formats. One with 4 transformers and 4 CCFL tubes, one with 2 transformers that lead to 2 CCFL connectors powering 2 tubes each (3 wires per CCFL)

When you order the 2SC5707's get extras just to be on the safe side. If it goes again, then turn the monitor off immediatly and check them. It should only be 1 failed again, so just see which of the 2 transformers it was primarily attached to and replace it, or both.

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  4. Fuse link (Marked with prefix FBxxx top middle of the board) - Replace
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Start with those and if you still have issues post back with a photo of your board from both sides.

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