Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

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  • audiogroove
    New Member
    • Dec 2009
    • 4
    #1

    Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

    Maxent MX-27x1 LCD TV when turned on it displays for a half second then screen goes off. Can still see computer output on screen with no backlighting. I took the whole TV apart and visually checked all the capacitors: none look damaged. While it was apart I found if I put pressure on opposing corners (longest dimension) the backlight would stay on until the pressure was released. After taking it completely apart and reassembling it wouldn't do that anymore. Back to only split second of backlighting when turning on or plugging/unplugging computer. When it is lit the lighting is bright and consistent. Any ideas? I should add that I'm very mechanically inclined and have done alot of soldering (have wired recording studios) but I am not an electronics tech.
    Tags: None
    • electroguy75
      Member
      • Dec 2008
      • 21
      #2
      Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

      from ur description of flexing board, sounds as if u may have a bad solder joint causing ur problems.chk solder joints and reflow all that look suspect. pay particular attention to transformer joints.cheers

        Comment

        • audiogroove
          New Member
          • Dec 2009
          • 4
          #3
          Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

          Originally posted by electroguy75
          from ur description of flexing board, sounds as if u may have a bad solder joint causing ur problems.chk solder joints and reflow all that look suspect. pay particular attention to transformer joints.cheers
          Power Supply transformers or inverter board transformers?

            Comment

            • electroguy75
              Member
              • Dec 2008
              • 21
              #4
              Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

              sorry, inverter board. cheers

                Comment

                • audiogroove
                  New Member
                  • Dec 2009
                  • 4
                  #5
                  Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

                  Anyone else have any ideas?

                    Comment

                    • PlainBill
                      Badcaps Legend
                      • Feb 2009
                      • 7034
                      • USA
                      #6
                      Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

                      Originally posted by audiogroove
                      Anyone else have any ideas?
                      The symptoms indicate a problem in the backlight system. Specifically, it appears the backlight protection logic is shutting them down. Electorguy75's idea of a bad solder joint is plausible, but it could also be a wiring problem to a CCFL. The first step is to identify the failure mode.

                      In cases like this, I suggest attaching good pictures of the inverter (top and bottom), including one with the CCFL leads plugged in.

                      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

                        • audiogroove
                          New Member
                          • Dec 2009
                          • 4
                          #7
                          Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

                          Originally posted by PlainBill
                          The symptoms indicate a problem in the backlight system. Specifically, it appears the backlight protection logic is shutting them down. Electorguy75's idea of a bad solder joint is plausible, but it could also be a wiring problem to a CCFL. The first step is to identify the failure mode.

                          In cases like this, I suggest attaching good pictures of the inverter (top and bottom), including one with the CCFL leads plugged in.

                          PlainBill
                          Thanks Plain Bill, I will post pictures as soon as I have time to disassemble the unit again.

                            Comment

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