Question about Quasar SP-3231 TV

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I have a friend with a quasar SP-3231 television manufactured in 1998. When they try to turn on the tv, you can hear the relays engage, but the picture never comes up. Preliminary testing indicates there in no voltage to the flyback or the color guns, but I have no schematic to try to trace the signals in order to determine where the problem is actually located.

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  • Michael Parker May 11, 2009

    I forgot to add that there was no sound either. I also tested a transistor that looked like it had been replaced. Seeing as I have no schematic, it makes everything very difficult to trace. There is no glow at the end of the tube, so you may very well be right. The transistor you mentioned may very well be the one I tested. It was an NPN with a part number: D25339, and when I tested it in circuit, there appeared to be a short between all three terminals using resistance measurements with the tv unplugged, and when I tried to take voltage measurements, all three terminals were very near ground. It is good to know I was on the right track. I will have to pull and test the transistor now. If it is the problem it will be about a $25 repair and should be an easy fix. Thank you.

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The set you are talking about I am unfamiliar with .. however as an engineer for 23 years I am sure it is not unlike any other CRT TV as you say you have no voltage on the rgb is the tube heater on ( you should see a glow at the end of the tube ) if not check you heater rail voltage , check your oscilator Ht output transistor should be 300 to 360 volts on the emitter if this goes down then the lineoutput satge will not opperate hence no picture and in many cases the audio is fed from the secondry of the Line output transformer hence no sound either .. DO NOT ATTEMPT TO DO THIS UNLESS YOU HAVE HAD TECHNICAL TRAINING VOLTAGES HERE ARE IN EXCESS OF 19 KV to 25,000 Volts DEPENDING ON TUBE SIZE AND SHOULD NEVER BE ATTEMPTED BY UNTRAINED PERSONEL... Vortash

Posted on May 10, 2009

  • clive pearson
    clive pearson May 12, 2009

    your welcome .. by the way should the Oscilator transistor blow again ( almost immedeately , then I would suspect the line transformer has a short on it and needs repalcing .. Vortash

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