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Panasonic hdtv model # th-42px77u won't turn on

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  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

Initially, pls determine if there are any indications that power is coming into the set such as any of the LEDs is lit. Additionally, pls check if any would be blinking. The sequence and number of blinks would correspond to a general area that the unit has sensed to be faulty. This would then point us to the probable fault and course of action.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 16, 2008

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  • Panasonic Master
  • 19,396 Answers

Try first unplugging power cable for ten minutes, and see if the TV restarts.

Posted on Dec 16, 2008

  • Ginko
    Ginko Dec 16, 2008

    IPlug off the TV power cord, also unplug all the TV cables to other devices.

    Wait ten minutes or longer, plug back the TV and restart it.

    If there is no power at all, and no sign of life, test a different AC socket, if still no joy, it is probably a faulty PSU.
    If the power plug is fused (like in UK), check the fuse on power cord.

    If the TV turns itself off completely, with no power and no led light,
    same as if the power cord was unplugged, then this is either a
    defective power cord or power adapter.

    If the TV goes on standby
    state and does not restart, then tv is on protect mode, and this
    happens when a fault is detected. This means that there is a defective
    component that is failing only under determined circumstances.

    If
    the AC networ is unstable, then that can be the cause for the TV goin
    off. In this case you restart the tv by leaving power cord unplugged
    for a while. this can also be tested by a technician.

    Call the technician the same and have the fault fixed, before the problem excalates and you get more damage to the TV set.

    If
    you are in case A, the technican will test power board, and easily spot
    and repair the fault, usually this kind of problem can be caused by a
    defective capacitor on power board.

    If you are in case b, it may
    be more difficult for the repairman to find the fault. This kind of
    faults are often caused by a faulty IC( for example defective
    convergence ICs) or a faulty component on one of the internal boards,
    and it is usually more difficult to locate the problem.



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