Question about Sanyo DS31520 31" TV

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Dead, no power indications at all

I am a Tech. No schematic for this TV. Fuse is OK all high power Semi's seem to be not shorted. Will not turn on.

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  • jplandry Aug 28, 2008

    The problem was the error amp, Q 605. I had two instances of this. I replaced it with a 1 amp PNP 100 MHZ device and it works fine...even at high ambient temperatures...which is the cause of this failure. It is a design problem in my opinion because this part is directly driving Q604. I measured the nominal Collector to Base (of 604) current to be higher than the devices spec. It is just a cheap **** 3906-like part.



    I hope this helps others.

  • Anonymous Sep 15, 2008

    tv. sanyo mod.ds19380 not channel

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Hi there.there are two 150k resistors in series on the psu,which tend to go open circuit.if this is the case,watch for the main cap as it can bite.switch set on and off,then check for 300 plus volts accross it five mins after switch off.if thats thecase,its those resistors.hope this helps.seve

Posted on Aug 28, 2008

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