Panasonic tx-55cx802b stuck on panel test mode

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  • gigigi
    New Member
    • Apr 2021
    • 5
    • UK
    #1

    Panasonic tx-55cx802b stuck on panel test mode

    Panasonic tx-55cx802b stuck on panel test mode.
    It was working normally but few days ago some of the LED reflectors fall off.
    I've opened it up carefully, re-glued, while it was open switched it on to test LEDs.
    Then carefully assembled back.
    After plugging in to power remote does not work.
    Using power button on the TV it turns on but gets itself into a panel testing mode: white, gradient, red, gradient, blue, gradient, green and so on switching between colours.

    Anyone knows how to get out of this panel testing mode?

    I've tried so far:
    Switching off via remote or using power button on the TV, switching back on via remote or power button on the TV. Removing power for seconds while pressing power on button on the TV.
    No difference so far.
    Help would be highly appreciated.
    Tags: None
    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales
      #2
      Re: Panasonic tx-55cx802b stuck on panel test mode

      It's probably that the ribbon cables are not re-inserted correctly. Did you lift the flap on the connector to remove / re-insert the ribbons.

      Also check that all the connectors are back in place especially the one that goes off to the IR sensor.

      Post some photos of the circuit boards.
      Willing to help but I'm no expert.

        Comment

        • Davi.p
          Hobbist Tech
          • Sep 2009
          • 4282
          • Italy - Milan
          #3
          Re: Panasonic tx-55cx802b stuck on panel test mode

          Same problem here with a different model after panel and tcon fixing attempt... lvds cables-connectors always handled with care, i will try continuity A.S.A.P.
          Last edited by Davi.p; 06-22-2021, 09:23 PM.

            Comment

            • gigigi
              New Member
              • Apr 2021
              • 5
              • UK
              #4
              Re: Panasonic tx-55cx802b stuck on panel test mode

              Opened TV. Tried to remove and re-insert all connectors.
              Problem solved.

                Comment

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