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Display Shutdown In BenQ 15″ LCD Monitor

By on October 13, 2008

This LCD Monitor BenQ FP567S with the model of Q5C3 came in two weeks ago with no power symptom and found that few of the power components have problem. After problem was solved the LCD Monitor went to soak test for couple of days and carefully packed into a box and delivered back to customer which was from another state. Few days later got a call from the customer saying that the moment the power was “On” the display came out for a while and shutdown. But at my technical place here the LCD monitor worked just perfectly good.

benq monitor

After got back the Monitor from the courier company as usual, in order to find out the reason why, one have to remove the cover and check it out again. After scanning and performed few test at the power/inverter board, the conclusion was that the boards were okay. So now the concentration was in the backlight. Since i have some used LCD monitor that have the same connector, it would be easy for substitution purposes. And the result was……… the bottom backlight have problem because after substituting the bottom backlight with a good one, the display never shutdown anymore. The next step was to remove the bottom the backlight and see how was the condition. To my surprised the backlight broke inside as seen from the photo below.

backlight broken

A replacement brought back the good and stable display-no more shutting down even after few days of burning in. I was wondered why the backlight could break internally because before the shipment the LCD Monitor worked just fine. The packing was good with many areas was covered with thick sponge. I could conclude that it may be due to very rough handling by the transport company. I did not suspect the customer (it could be the customer dropped the monitor on the floor) because there were no dented marks at the angles.

I already spoke to the customer and she will be calling the transport company to handle the box with care and hope no more similar case. I gave the customer free of charge since it was not them that broke the backlight. This time round had put extra careful in packing the LCD Monitor and will be sending out the box tomorrow.

By the way if you have the schematic for AOC colour monitor model:  4vrl,FCC ID ARSCM 3500

kindly met me know. Thanks!



  1. mojtaba

    December 13, 2008 at 2:18 pm


    i have a lcd benq model"fp567s" that is this problem.

    after time lcd go to shutdown .

    but connectors are true.

    please help me?

  2. admin

    December 13, 2008 at 10:01 pm

    Hi Mojtaba,

    It could be backlight faulty or problem in the inverter board. Makes sure the output of the high voltage transformer have more than 500vac.


  3. Tariq

    December 14, 2008 at 3:48 pm

    i required Power suply cercuit diagram BenQ LCD Model Q5C3

  4. admin

    December 16, 2008 at 8:24 pm

    Hi Tariq,

    Sorry i do not have this diagram. Have you try ?


  5. Ron

    June 20, 2009 at 9:26 am

    Have ctx lcd pv720a powers on then shuts off after 3 seconds. The capacitors on inverter board one is cracked and the other shows signs of bulging. The numbers on them are 100mpp4 h224j=k does anybody know where to buy them.Or if someone knows if it could be another problem. Ron 386-822-9200

  6. admin

    June 22, 2009 at 7:24 pm

    Hi Ron,

    Try replace the cap first (.22uf 100 volt) and this cap is quite easy to get from any local supplier. If you can't find then i suggest that you visit


  7. prakash

    August 3, 2009 at 4:23 pm


    Can I get the circuit diagram of BENQ 15inch LCD monitor (48.L0H02.A00) power supply board?

  8. admin

    August 3, 2009 at 10:44 pm

    Hi Prakash,

    Sorry i do not have the schematic.


  9. subash

    January 10, 2010 at 3:55 am

    i have a LCD monitor model#FP567s,if i power on the monitor it will not power up. the same time the blue color power LED blinks then hardly hit on the back side frame it will work OK. i feel this because of loose connection then i open and check the all connectivity, there is no issues i found. what could be the problem? please help me if you have any idea about this!!!?

  10. admin

    January 10, 2010 at 11:14 am

    HI Subash,

    Is the output voltages from the SMPS stable? Is the Mainboard receiving all the voltages? Your problem could be dry joint/loose connection because when you hit it, it worked normally. Try turn on the Monitor with cover open and gently hit it with the handle of screw driver on the mianboard,power and inverter section.


  11. Jonathan

    October 19, 2010 at 3:23 pm

    i have two of these monitors, and both appear to be suffering from the same problem. both turn on, and after a few seconds they go dark, however you can still see the output image on the display, if you look closely. what would be causing this, is it a backlight issue, or is it to do with the boards?? your help on this would be greatly appreciated.

  12. admin

    October 20, 2010 at 3:56 am

    HI Jonathan,

    Most likely it is a backlight issue. Before that you have to make sure no dry joints in the high voltage transformer pins and the supply from the SMPS are good and stable (no bulged caps).


  13. thanveer

    March 13, 2011 at 2:44 pm

    beng.model-q5c3 my monitor disply in some time com and some time not com pls send a mail wath the proplume of monitor and how to test in monitor

  14. admin

    March 14, 2011 at 5:32 am

    HI Thanveer,

    Please check for bulged filer cap and make sure the backlight is good. If one of the backlight have problem the display will shutdown.



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