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Onwa TV K-9215 ---turns off after a few minutes

Discussion in 'Electronic Repair' started by Aldo Barrios, Jan 9, 2004.

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  1. Aldo Barrios

    Aldo Barrios Guest

    Five minutes after you turn on this tv it will shut down. Then , you
    have to press the power button on the front panel of the tv to turn it
    on (just once). And it will go off after five minutes again.
    It seems that someone removed Q905 (G A K. printed on pcb) and IC902
    (G A1 A2).
    Any ideas?
    Thanks
     
  2. Jerry G.

    Jerry G. Guest

    I would troubleshoot the set for a power supply, or scan fault. It is
    possible that there are some parts that have become thermo sensitive from
    age and use, and the set is going in to protection.

    This is not something you will be able to service at home, unless properly
    trained, have the service manuals, and the proper tools to work with.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    Five minutes after you turn on this tv it will shut down. Then , you
    have to press the power button on the front panel of the tv to turn it
    on (just once). And it will go off after five minutes again.
    It seems that someone removed Q905 (G A K. printed on pcb) and IC902
    (G A1 A2).
    Any ideas?
    Thanks
     
  3. jakdedert

    jakdedert Guest

    Good advice from Jerry, as usual...re: your second question; many times
    equipment is designed with features which are left off the basic models.
    They use the same circuit board, but leave blank the spaces which relate to
    the components used to implement those features. Most likely nobody
    actually 'removed' anything from your set. They were never installed.

    jak
     
  4. Brian Sandle

    Brian Sandle Guest

    I had an Onwa board on which the voltage regulator shut down. (A black
    object perhaps 2" by 1" by 1/2". It dissipates quite a bit of heat, as the
    input voltage at a guess was about 16V, regaulting down to 12V, and the
    set might work a bit longer on a 12v DC supply. Even improving the
    aluminium heat sink contact was not sufficient.
    I am not sure if the regulators are obtainable on the older sets. You
    might have to improvise.
    It gets worse and worse.
     
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