Question about Sony KP-51WS520 51" Rear Projection HDTV-Ready Television

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KP-51WS520 wont turn on - standby & timer lights on constantlly

4yo Sony KP-51WS520 does not turn on. Both the standby and timer lights are on constantly, no blinking. Reset does not change anything. Just before this happened, tv seemed caught in a loop - trying to start itself, but not being able to, over and over - saw the tv doing this, unplugged it, and... the steady lights appeared. Any insight or testing I can try would be appreciated. Thanks!

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  • mark_stein Dec 05, 2008

    No experience w/big screen tvs but enough w/smaller electronics to chk the voltage and take a look. I have the service manual and see IC702 on the A board. Thanks for explaining why the lights don't blink. If this is the problem can I just replace that board?

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You need to check supply volts on main micro IC702 on main board of Sony KP-51WS520 TV.
If you have experience of big TV repair then I would recommend to get service manual of TV from any online store and check above said IC supply volts. TV must give error by blinking light in case any problem in drive circuits and if main micro fried, no error signal will be there.


Posted on Dec 05, 2008

  • Shahid Electronics
    Shahid Electronics Dec 05, 2008

    I think you should check supplied voltages for that IC like..
    3.3 volt on pin 16
    STBY 5 volt on pin 99
    If above said are available, then IC is defective and replace A board.


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