Maxent p420542hm8 - Screen will only come on with a heater behind it

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  • gopro25
    Member
    • Jan 2012
    • 23
    #1

    Maxent p420542hm8 - Screen will only come on with a heater behind it

    Hey there again guys.

    Got a plasma now...


    The guy I got this TV from said that he was able to get the screen to come on by putting a heater in the center of the back of the TV at the very top.

    I put the heater where he said and I could not get the screen to work.
    The best I could get were some wild looking flashes of light on the screen.
    (See attached .zip for video)

    The main board is up high in the center. (See attached pictures)
    What could be the cause here?

    Thanks!
    Attached Files
    Tags: None
    • gopro25
      Member
      • Jan 2012
      • 23
      #2
      Re: Maxent p420542hm8 - Screen will only come on with a heater behind it

      To clarify, the video shows the flashes that happen only when the heater is applied to the main board.

      With no heater, all I get is a glowing black screen.

        Comment

        • japlytic
          Badcaps Legend
          • Oct 2005
          • 2086
          • Australia
          #3
          Re: Maxent p420542hm8 - Screen will only come on with a heater behind it

          I remember my parents' telling me about their Rank Arena colour TV bought in 1975 developing bad solder joints over time, and heating it made it work for some time.
          On an LG plasma TV I tried to repair for someone, applying heat to the boards with a hairdryer caused it to shut down over time, and the board most sensitive to heat was the power supply board.
          My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

            Comment

            • PlainBill
              Badcaps Legend
              • Feb 2009
              • 7034
              • USA
              #4
              Re: Maxent p420542hm8 - Screen will only come on with a heater behind it

              A glowing black screen would indicate the plasma panel is working but there is no video signal. Do you have sound?

              The prospects for a successful repair aren't good. What you call the 'main board' is the power supply. The main board is below it.

              I agree with japlytic - it sounds like a bad solder joint.

              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

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