Magnavox 42MF531D/37 green power LED, no video/audio

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  • sparr
    New Member
    • Nov 2011
    • 2

    #1

    Magnavox 42MF531D/37 green power LED, no video/audio

    When I plug in my TV I get a green glowing LED on the power button. If I press or hold down the power button it glows brighter green. Other than that LED the TV is nonresponsive. I've got it open right now. I don't see any obviously blown/burnt components on the power board or the video/control board. Is there anywhere else I should be looking? Or some other testing I can do to find the bad part?
  • PlainBill
    Badcaps Legend
    • Feb 2009
    • 7034
    • USA

    #2
    Re: Magnavox 42MF531D/37 green power LED, no video/audio

    Originally posted by sparr
    When I plug in my TV I get a green glowing LED on the power button. If I press or hold down the power button it glows brighter green. Other than that LED the TV is nonresponsive. I've got it open right now. I don't see any obviously blown/burnt components on the power board or the video/control board. Is there anywhere else I should be looking? Or some other testing I can do to find the bad part?
    Check the standby voltage out of the power supply - obviously it is present, but is it at the correct voltage?

    Check the PS_ON or equivalent signal from the main board to the power supply. Does that change state when you press the power button?

    Do the main outputs of the power supply come up?

    PlainBill
    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

    Comment

    • sparr
      New Member
      • Nov 2011
      • 2

      #3
      Re: Magnavox 42MF531D/37 green power LED, no video/audio

      Originally posted by PlainBill
      Check the standby voltage out of the power supply - obviously it is present, but is it at the correct voltage?

      Check the PS_ON or equivalent signal from the main board to the power supply. Does that change state when you press the power button?

      Do the main outputs of the power supply come up?
      I haven't gotten to identifying the various +V and signal lines yet, and they aren't labeled. I'll be tracing wires between boards soon. Thanks for the tips.

      Comment

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