Question about Sony KV-32S40 32" TV
When the horizontal output (2SC4927) is shorted it means one of 2 things is wrong - the horizontal drive transformer has cracked solder joints or the flyback transformer is shorted inside. If the solder joints on the horizontal drive transformer (the small grey transformer connected to the base of the horizontal output transistor) are cracked then the set will play for a little while and then the parts you just replaced will again be destroyed. ALWAYS resolder the driver transformer when replacing the parts you mentioned! When I replace the parts you mention and I do not see any obvious cracks on the driver transformer then I unsolder the B+ pin of the flyback (labeled 135, for 135 volts) and put a 60 to 100 watt lightbulb (drop-light) in series with the flyback. This means that the 135 volts B+ goes through the lightbulb and then into the flyback, so the lightbulb acts as a current limiter to protect the horizontal output. When you turn the set on the bulb should glow no more than about half bright and you should hear the high voltage come up, but you should not see a picture. If you turn the set on and the bulb glows as bright as if it was plugged into the wall then you can bet that flyback is shorted and must be replaced.
Posted on Jul 13, 2007
Hi there, Lou from crown tv in deerfield beach fl. I see these all the time. When you expirence this problem after you replace the IC 601 , or Q601 & Q602 in other sets also check the Horizontal output transistor if shorted replace and solder the horizontal drive transformer and all the connections in the path from the transformer to the horizontal output, including the output itself, open base connections can cause the transistor to fail, then change the cap just off of the driver transformer it is 0.47 mfd @ 50 volts [i use a 100 volt part for longevity]. if the the IC [or transistors] keep blowing, try T601, it will be shorted. The flyback is another culprit but i dont see that one too ofted. one last thing to look for is a reduced value filter cap on the +17 and/or +22 volt supply. i know this is long winded but covers about 99.5% of this type of failure. hope this helps you and anyone else out.
Posted on Jun 13, 2008
Check the horizontal driver and the caps related to it,i`m sure the problem is in a crack solder jints or in a pin of a caps.the problem is in a loose pin!
Posted on Apr 23, 2014
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