Question about BenQ FP71G 17" LCD Monitor

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BENQ 71G monitor wont turn on

The LED light does not come on when the On button is pushed. On the main circuit board the fuse, power diodes and main switching transistors seem OK. Is a circuit diagram available? I am a now retired electronics Engineert.

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5 Suggested Answers

  • 97 Answers

SOURCE: No Image

Typical failure is High voltage supply. Can you hear a high pitch whine or the relay click on and off? You will need some test point reffence voltages for the board and confirm you do not have a damaged VGA cable. It is not easy to give step by step via forum. Google "monitor repair", there were a couple good general guides that are printable. If youe high voltage tranformer (flyback) is gone, do not go any further. Price of a monitor flyback is $65 to over $100 depending on model.

Posted on Apr 10, 2007

viziks
  • 220 Answers

SOURCE: BenQ FP731 17" Inverter transistors

T751,752,753,753 are the transformers to be resoldered ,and resolder Transistors Q759,60,39,40,43,51.
Please check them with a multimeter if you are adept .
Please rate the solution and provide feedback.
Samir

Posted on Apr 25, 2008

  • 5 Answers

SOURCE: BenQ FP767 17" Problem: Monitor wont turn on

Check four 5707, two 9204, and one bel 3A slow blow fuse. Also re-solder all cap and transformer.It's quiet common on benq and Dell(benq OEM) 17 LCD. For detail google "benq 5707", sure you can found. Good luck

Posted on Jul 19, 2008

viziks
  • 220 Answers

SOURCE: Benq inverter board schemtic

Post me a picture of the board and I might be able to Help.Normally transistors 2Sc5707 are defective.
Samir.
viziks@gmail.com

Posted on Sep 12, 2008

budmrtn
  • 11361 Answers

SOURCE: indicate the various electronic componenets of mobile phones

What is the exact question? Rxxx for resistor, cxxx for capacitor, uxx for IC, DXX for DIODE, QXXX for transistor, TXXX for transformer, FXXX for fuse.

Posted on Nov 01, 2009

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PLease rate solution and provide feedback.

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Please rate the solution and provide feedback.

Samir

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