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Hisense LCD42V68PAM weird picture no BL

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    #1

    Hisense LCD42V68PAM weird picture no BL

    Hi guys,

    Front LED turns from red to blue, then blinks 6x red then stays blue, mainboard doesn't turn on the backlight and TV becomes unresponsive after power on. When I force the backlight on I see only a few square inch large noisy picture without any content.

    All voltages on the board are present, 12V, 3V3, 5V, 2.6V, 1V. Crystal for uC oscillates at correct frequency 27MHz but forcing it to stop doesn't do anything. It looks like the uC FW doesn't run...

    schematic is attached

    Any ideas?
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    #2
    Re: Hisense LCD42V68PAM weird picture no BL

    Probably the main IC, flash or the ram. did you check all the regulators and ldo's? Maybe try some heat or freezer spray (can of air upside down).

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      #3
      Re: Hisense LCD42V68PAM weird picture no BL

      Originally posted by CapLeaker View Post
      Probably the main IC, flash or the ram. did you check all the regulators and ldo's? Maybe try some heat or freezer spray (can of air upside down).
      yes voltages are all there, heat has no effect, cooling spray is out.

      too bad...

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