SAMSUNG UE40H7005 - no picture but backlight and bootlooping

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  • olegeisler
    Senior Member
    • Dec 2016
    • 100
    • Denmark
    #1

    SAMSUNG UE40H7005 - no picture but backlight and bootlooping

    Hi

    Have this 2015 40" SAMSUNG UE40H7005 - see pictures attached.
    Owner really wants THIS TV fixed... But really has no value...

    Symptoms : No picture ( and no sound ) - but backlight OK, seems to boot-loop though, backlight on for approx. 15 seconds, then off one second - and repeat indefinitely.

    Sanity check of voltages seems OK, heatsinks on both mainboard and T-con heats up. Mainboard is BN94-07352J

    Unable to find manual / schematic, and very little information in general.

    Is it just a corrupt NAND / bad mainboard - so I should just forget it, or does anyone have a hint ?
    Attached Files
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    • R_J
      Badcaps Legend
      • Jun 2012
      • 9553
      • Canada
      #2
      Re: SAMSUNG UE40H7005 - no picture but backlight and bootlooping

      Try disconnecting the flat cable between the main board and t-con board, If the tv stays on, re connect it and try disconnecting one of the flat cables between the t-con and the panel. Try one then the other one. Connect and reconnect cables with power off.
      If when the t-con is disconnected it still reboots, try heating the heatsink where the large bga chip is located, It could be a bad bga connection.

        Comment

        • olegeisler
          Senior Member
          • Dec 2016
          • 100
          • Denmark
          #3
          Re: SAMSUNG UE40H7005 - no picture but backlight and bootlooping

          Thank you

          Disconnecting the MB>T-con cable status :

          - Current consumption decreases
          - No backlight ( explains the creduced current consumption )
          - Still boot looping

          I guess bad mainboard, will try to reflow main CPU tomorrow, unless a better suggestion arrives here.........

          THANKS !

            Comment

            • olegeisler
              Senior Member
              • Dec 2016
              • 100
              • Denmark
              #4
              Re: SAMSUNG UE40H7005 - no picture but backlight and bootlooping

              CPU now reflowed - still bootlooping, but no backlihght.

              Will give the bad news to the owner, and this one will go to scrap...

              THANKS for helping out.

                Comment

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