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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Benq 567s lcd monitor does not power up. Switch led blinks but goes dead. Tried replacing capacitor 450v 82uf with 400v 100 uf but did not work. please help.


That cap is for the Primary power supply switching circuits. How is the DC secondary side, no blown fuse, shorted transistors in the inverter circuits? Pictures will help, budmrtn@aol.com
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net
It may have the same bd as DELL since BenQ makes monitors for DELL and HP.

May 21, 2010 | BenQ FP71G 17" LCD Monitor

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BenQ FP71E turns off after 2 secs- Logo flashes then turns off


LCD monitors behaving in this fashion more than likely have a faulty inverter. Refer www.lcdparts.net for solutions.

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1 Answer

I have a benq t701 with power problems


faulty power board... possibly caused by blown capacitors..

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3 Answers

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

Jul 07, 2008 | BenQ FP767 17" LCD Monitor

1 Answer

Can't find video signal


If screen says "Signal cable not connected " all the time till power led switches to Amber chances are monitor is ok and problem is with graphic card or cpu.Connect to Known working CPU and confirm that monitor is the problem.
If same problem persists on another working cpu after changing signal cable,the interface board in the monitor could be defective.
Samir

PLease rate solution and provide feedback.

Jun 09, 2008 | BenQ FP731 17" LCD Monitor

1 Answer

BenQ FP767 17" LCD Monitor Problem - Power LED Blinks


Look for small power transistors 2SC5707 near yellow invertor transformers which go to backlight connectors.
But if problem is blinking power LED powersupply capacitors maybe an issue,check visualy and/or replacement.
Also fuse that maybe blown is not glass fuse near mains socket,It is semiconductor black or yellow colour labeled PFxxx near heatsinks of power supply secondary.

Please rate the solution and provide feedback.

Samir

May 25, 2008 | BenQ FP767 17" LCD Monitor

2 Answers

Benq screen shuts down when pc is plugged in


If it's a 71g and not 71g+ resolder transistors 2sc5707 on invertor board along with grey condensers and inverter transformer.This should solve the problem if it was display shutting off with power led remaining on.Otherwise check power section.

Feb 24, 2008 | BenQ FP71G 17" LCD Monitor

1 Answer

BenQ FP591 15" monitor decides to die


Strange that both should show the same symptoms don't you think? Have you changed anything computer wise? Graphics card or resolution? Screeching noise is a puzzle too. How are they powered - internally or via a separate power supply?

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5 Answers

BenQ FP71G+


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.

May 05, 2007 | BenQ FP71G 17" LCD Monitor

3 Answers

Light is green, but monitor just goes on for a split second then it goes off.


density, I agree from what you have described it might be the inverter board, however, I wouldn't start tearing and replacing based on your description just yet. With the computer on and the monitor power LED green shine a flashlight in the lower left hand corner of your screen. Look for the Windows ?Start? button, if your backlight and/or the inverter board is not working you?ll see a faint ?start? button if you look closely. If that is the case I wouldn't recommend randomly re-soldering or replacing parts on the inverter board. Unless you physically see damage or have the ability to trouble shoot the failure to a discrete component I would suggest replacing the entire board if it is economically worth it. Depending on the monitor this is usually an economically repairable problem. Let us know if you have any other questions and please don?t forget to rate this posting.

Apr 25, 2007 | BenQ FP737S-D 17" LCD Monitor

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