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    #1

    BENQ fp71e+

    Hei!

    And again I have a problem with my Benq monitor. it is the same that was here:

    https://www.badcaps.net/forum/showth...644#post107644

    till now it worked perfectly, but now it starts to change collor pixel by pixel, and when I pug another display, it shows only the new one.

    On black collor it shows like snow, but green. I know that it is not the problem in software, because I took a screenshot, and it was perfect on my old crt monitor!

    Maybe some suggestions!? last time you helped me, can you please help me now?!

    thanx!
    Tags: None
    #2
    Re: BENQ fp71e+

    Originally posted by rihardiii View Post
    but now it starts to change collor pixel by pixel, and when I pug another display, it shows only the new one.

    On black collor it shows like snow, but green. I know that it is not the problem in software, because I took a screenshot, and it was perfect on my old crt monitor!
    Post pics of your logic board. Are there caps on the logic board?
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      #3
      Re: BENQ fp71e+

      there they are.
      Attached Files

      Comment

        #4
        Re: BENQ fp71e+

        Originally posted by rihardiii View Post
        there they are.
        That is the power/inverter board. The logic board is the one with the VGA connector.

        You will also need better photos as well.

        For best picture quality and clarity take your boards to a window on a sunny day, turn flash off, and use macro mode. Take a top down view of all your boards (front and back). Make sure the photo is legible so that we can read the PCB printing clearly. A shutter speed of 1/125 or faster will produce nice clear focused pictures. Try to get a photo that is 2000x2000 resolution or as close as possible.

        https://www.badcaps.net/forum/attach...4&d=1280167246
        Last edited by retiredcaps; 09-19-2010, 12:37 PM. Reason: better quality photo
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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.

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          #5
          Re: BENQ fp71e+

          Ok. Ill do it when ill get a chance, to take that picture. and for now there is 13 small caps, and 1 very smal cap.

          Comment

            #6
            Re: BENQ fp71e+

            so, there they are. the best i could make.
            Attached Files

            Comment

              #7
              Re: BENQ fp71e+

              I can only think of 4 things to test/try.

              1) Try the alternate port. If you are using VGA, try the DVI to see if the same thing happens or not.

              2) U8 is a voltage regulator. Put your multimeter on 20V DC. Put your black probe on a ground screw. Put your red probe on the pins of U8. Report all voltage measurements. I'm expecting 0V, 5V, and probably 3.3V DC (or 1.8V).

              3) Blow a fan directly onto the logic card and see if the problem is heat related.

              4) Caps do not have to bloat to be bad. They can have incorrect uF or high ESR (ohm). As a last resort, you may want to try and replace all the caps.
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                #8
                Re: BENQ fp71e+

                I already tried different ports, but the problem stays the same.

                Tested voltage regulator and it showed:
                first from left - 3,26 (I guess it is 3,3)
                in the middle - 1,8
                last one - 0

                Comment

                  #9
                  Re: BENQ fp71e+

                  Originally posted by rihardiii View Post
                  Tested voltage regulator and it showed:
                  first from left - 3,26 (I guess it is 3,3)
                  in the middle - 1,8
                  last one - 0
                  The readings look good.
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                    #10
                    Re: BENQ fp71e+

                    ok and now i have to unsolder all caps ant test them right?!

                    Comment

                      #11
                      Re: BENQ fp71e+

                      Originally posted by rihardiii View Post
                      ok and now i have to unsolder all caps ant test them right?!
                      Caps can be tested for uF using a multimeter with a capacitance checker.

                      Caps can be tested for ESR using an ESR meter.

                      If you have neither capabilities to test the above, then changing the caps *might* solve your problem. However, you should not get your hopes up as it could be anything on the logic board or the panel itself that is at fault.
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