Sharp lc-52sb55u - No power LEDs when I press power button

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  • fixmytv
    New Member
    • Apr 2013
    • 4
    • US
    #1

    Sharp lc-52sb55u - No power LEDs when I press power button

    Hey - I upgraded the firmware on my lc-52sb55u today, and I think something went wrong with that.

    I updated the firmware and the TV rebooted - and seemed to be working. I went out and came back later and found that the TV wouldn't turn on with the remote - then tried with the power button. Nothing happens with the LEDs on the front at all when the button is pressed.

    I checked all of the PD pins, but see 0V on all but 3.1V on the AC_DET pin and 4.9V on the BUSY pin. I tried to see if the PS_ON pin would get voltage for a moment when the power button is pressed, but no luck.

    Have any ideas on what to check next, or will I need to buy a new mainboard?

    This site has been awesome - I have read up a lot on all of the related issues I could find.

    Thanks for taking a look!
    Paul
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    • fixmytv
      New Member
      • Apr 2013
      • 4
      • US
      #2
      Re: Sharp lc-52sb55u - No power LEDs when I press power button

      I've also tried some of the tricks suggested to restore firmware - holding down the power button for 5-6 seconds while plugging in the tv. It didn't seem to do anything at all.

        Comment

        • fixmytv
          New Member
          • Apr 2013
          • 4
          • US
          #3
          Re: Sharp lc-52sb55u - No power LEDs when I press power button

          Replacing the main board solved the problem.

            Comment

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