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    #1

    BenQ FP71E+

    Hei Remember I wrote once:
    --------
    I have a huge problem. I have a BenQ FP71E LCD monitor.
    I will describe a little.

    It has transparent (almost) power button and when I push it, the led behind it turns blue, than the display shows the title BenQ and after that he notices that he got no signal and goes to sleep, after that the led behind power button turns orange.

    So it would be very nice if it would be like that right now too. but!
    here is the problem:

    When I push my power button the led turns blue as it should do, but after 2 seconds it just turns off, without display monitoring big BenQ title, and without the led turning orange. no life except the start when it turns blue on 2 seconds.

    So there is one huge cap on power board. I noticed that it is totally dead, so I replaced it with new one. but the problem have not gone.
    Right now i don't know what to do...

    Please help!!!
    --------


    And ok. I managed to get it to work, by replacing all C5707 and FU9024N tranzistors. I was so happy, but than after a while, whell it was 5 days, i was watching movie and the monitor started to get darker and darker untik the picture just disapered, and again, I can't turn it on. the same problem as i had. So what can be wrong?! what could cause the tranzistors to die?!
    can you help?!


    So you told me to post the pictures, and so I did, now.
    I hope I did it correct.
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    #2
    Re: BenQ FP71E+

    Did you resolder all the transformer joints after you replaced all the components? It has been suggested that Benqs are really bad for poor transfomer solder joints.

    Originally posted by rihardiii
    Hei Remember I wrote once:
    And ok. I managed to get it to work, by replacing all C5707 and FU9024N tranzistors.
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      #3
      Re: BenQ FP71E+

      I think that was ok. It was working wery good for 5 days. and my english isn't wery good so I hope I understood what you are saying.

      Comment

        #4
        Re: BenQ FP71E+

        Just so you understand, did you retouch up the solder or reflow the solder at the transformers (which are those yellow square things) at locations T801, T802, T803, and T804?

        You normally retouch or reflow on the back side.

        Originally posted by rihardiii
        I think that was ok. It was working wery good for 5 days. and my english isn't wery good so I hope I understood what you are saying.
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          #5
          Re: BenQ FP71E+

          now i understood, and no i didn't.
          so you say that it could be the problem?!

          Comment

            #6
            Re: BenQ FP71E+

            It takes a few days for heat to flex the board enough times to activate the bad joint.

            Touch and reflow isn't good enough. Add a bit of fresh solder. The extra metal is good and the extra flux cleans the existing solder. That's still poor quality work though. Good quality work is to remove all existing solder and resolder with new.
            sig files are for morons

            Comment

              #7
              Re: BenQ FP71E+

              ok i'll try this one.

              Comment

                #8
                Re: BenQ FP71E+

                Good point. I will keep this in mind for myself for future use.

                Originally posted by severach
                Touch and reflow isn't good enough. Add a bit of fresh solder. The extra metal is good and the extra flux cleans the existing solder. That's still poor quality work though. Good quality work is to remove all existing solder and resolder with new.
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                We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                Please do not post inline and offsite as they slow down the loading of pages.

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                  #9
                  Re: BenQ FP71E+

                  tnx. I guess it helped, now it's already 5 days since i did that, and it's working pritty well! thank you!

                  Comment

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