Sharp TV LC-42LB261U- Doozey! No LED from power after the PSB has been replaced

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  • Fellow
    New Member
    • Sep 2015
    • 2
    • United States
    #1

    Sharp TV LC-42LB261U- Doozey! No LED from power after the PSB has been replaced

    Sharp TV LC-42LB261U

    Wouldn't turn on when plugged in. No LED indicator either. Thought for sure this would be a PSB problem.

    Replaced the PSB the first time and thought it was just a bad unit. Returned. Ordered new PSB. Plugged this one in and still the power button does not a thing when touched.

    Puzzling... And I'm a TV repair noob, so I request guidance from the elder gods. I have a volt meter and a soldering kit.

    Could this somehow be a problem with the actual cord connecting the PSB to the button board?
    Could this be a main board problem somehow?
    Waddup wit dat?

    Edit:
    Oh, I also checked the DC voltage out from the PSB.
    The schematic on the board said:
    15. 5v 16. 5v
    12v 12v
    12v 12v
    12v_A 12v_A
    GND GND
    GND GND

    And sticking the pins in each one of them I only got a few that read 15v. Is that normal?
    Last edited by Fellow; 09-19-2015, 11:12 AM.
    Tags: None
    • Alastair E
      Chief Womble
      • Mar 2013
      • 1963
      • U.K.
      #2
      Re: Sharp TV LC-42LB261U- Doozey! No LED from power after the PSB has been replaced

      Prolly a Mainboard fault.
      TELEFIX

      How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
      http://www.irf.com/technical-info/appnotes/an-1088.pdf
      PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

        Comment

        • Maklaud
          Senior Member
          • Sep 2015
          • 56
          • Russia
          #3
          Re: Sharp TV LC-42LB261U- Doozey! No LED from power after the PSB has been replaced

          Hello.
          Can you use service manual?
          Attached Files

          if you find these attachements useful please consider making a small donation to the site

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