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TV turns itself OFF and back ON

Discussion in 'Electronic Repair' started by chibitul, Nov 1, 2005.

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  1. chibitul

    chibitul Guest

    I have an 8-year old Panasonic TV that I repaired recently thanks to
    nice people in the group. thanks again!

    Now after about 2 months or so the TV started to turn itself OFF and
    back ON. It did this maybe once a day, then twice, now this evening did
    4 or 5 times.

    It stays OFF for about 2 minutes, but I didn't check to see if it is 2
    minutes even. I tried to reset it (unplugged everything for a day). I
    did not set the clock, and I turn the timer off. I don't know what else
    to do. I noticed that when it comes back ON it displays the menu on the
    screen (setup, timer, picture, etc). Also while it is OFF you cannot
    turn it back ON. I tried both the remote and the switch in the front,
    no go. It's just dead, but I think I hear some noise inside, almost
    like the TV would be ON without picture.

    I don;t have the sound hooked up, I use it as a monitor, and the sound
    goes to the stere system. I should probably connect the audio straight
    from VCR to TV and see if the audio circuitry is also OFF or ON during
    this time.

    Any other ideas? seems to be a "digital" effect, I don't think there is
    something that overheats or another "analog" defect. When it comes back
    ON it is 100% functional, picture is perfect.

    Thanks again.
     
  2. James Sweet

    James Sweet Guest


    Did somebody wash the screen and drip cleaner into the power button?
    Might also be worth checking to make sure it isn't the remote control
    malfunctioning, take the batteries out and see if the problem persists.
     
  3. b

    b Guest

    snip----

    sounds like the micro may be confused, or there is a broken trace on
    the pcb near the clock/data bus lines. maybe the crystal is poorly
    soldered??
    -B.
     
  4. Golf

    Golf Guest

    I can't say I am familiar with this specific set, but I had the exact
    same problem with a Sanyo. When the set shuts off, apply freeze spray
    to the on/off relay in the power supply. If the set comes on, this is
    the problem. The relay would open when it warmed up, then close when it
    cooled off. I replace this one about 4 months ago, and the set is still
    working fine. Good luck.
     
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