Sharp LC-32D62U Vertical Lines/No Picture

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  • Minkey
    New Member
    • Dec 2017
    • 9
    • Canada
    #1

    Sharp LC-32D62U Vertical Lines/No Picture

    Hi all, been reading a lot of posts about similar problems to mine regarding error codes and get confused about how to count the light patterns.

    My original problem can be seen in Pic1 & Pic2. I thought a T-Con problem at first but a replacement board produced the same results. Purchased a Main board off eBay and the problem went away, had a perfect picture (for a day). Powered on the next day and ran perfect for 15 minutes then went into error code after 3 power cycles. Error is OPC and Power blink once together then Power blinks another 2 times and then the whole blink sequence repeats itself.

    I have the service manual for this model TV. Is the error a Power Failure (Power LED flashes twice and OPC LED flashes) or Communication failure (Power LED flashes three times and OPC LED flashes)? I suspect Power failure D_POW based on the voltage readings but in some posts all the Power LED flashes are counted and in others only the Power LED flashes after the OPC and Power flash together are counted.

    I didn't take voltage readings until the replacement Main board started to fault. The voltage readings at startup at the respective connectors on the Main replacement board are:

    P9701 (PH)
    Pin 1: 5.9v 6V
    Pin 2: 0.0v GND
    Pin 3: 0.0v PNL 12V
    Pin 4: 0.0v PNL 12V
    Pin 5: 0.0v GND
    Pin 6: 0.0v GND
    Pin 7: 9.8v 10V
    Pin 8: 9.8v 10V
    Pin 9: 0.0v GND
    Pin 10: 0.0v GND
    Pin 11: 13.1v AMP 13V
    Pin 12: 13.1v AMP 13V

    P9702 (PD)
    Pin 1: 2.9v PS_ON
    Pin 2: 3.1v AC_DET
    Pin 3: 0.0v GND
    Pin 4: 0.0v PNL_POW
    Pin 5: 5.0v BU5V
    Pin 6: 0.0v GND

    When I replaced the Main board with the original Main board the voltage readings were the same as above but P9701 Pin 3&4 were 11.8v each and P9702 Pin 4 was 3.3v which is why I have picture albeit with the vertical lines.

    Pic 3: Board Layout (all original boards)
    Pic 4: Main board purchased off eBay
    Pic 5: Power supply board (original)

    So, I have vertical lines in my picture with the original Main board and no picture with the replacement Main board. If anyone can point to further troubleshooting in either scenario it would be appreciated.

    Merry Christmas to all and Happy New Year!
    Attached Files
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    • Minkey
      New Member
      • Dec 2017
      • 9
      • Canada
      #2
      Re: Sharp LC-32D62U Vertical Lines/No Picture

      Anyone?

      My original problem - vertical lines in picture, most noticeable on light coloured images. Can it be traced to any specific component with some testing?

      Replacing the Main board fixed the picture problem for a day but now it is causing the Power Supply to shut down all voltages through P9701 once it faults. I would like to understand how this all works if anyone cares to spend the time with me? Thanks.

        Comment

        • dskall
          Badcaps Legend
          • Oct 2016
          • 2905
          • usa
          #3
          Re: Sharp LC-32D62U Vertical Lines/No Picture

          I would say you got a faulty main board. Not sending out signal to turn on panel power.
          I assume no responsibility for any stupid suggestions I might post.

            Comment

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