Question about Sanyo HT32744 32" TV

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Sanyo DS31650 31

As a science and tech nut decided to take on the tv for learning problem and what i have done.. 1-typical power-on seconds later HV shutdown 2-replaced Horiz Out Transistor 3-it worked!,but, width became wavy and HV shutdown after 45 sec.Had trouble adjusting white balance. 4-replaced flyback transformer. improved white balance, still shutting down 5-voltage checks in multiple points on board seem to all be around 2x listed rating of said points. suggestions?????

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Mike Longo

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If the set runs at all, your flyback and output transistor are good. If the set shuts down after a few seconds and the sides are wavy, it usually means that the main B+ in your power supply is too high and not regulating properly. I do not know what kind of power supply that model uses, but if has an old-style STR regulator (like the STR30130) then it is probably shorted, and if the set uses a switching power supply then look for an open or leaky electrolytic cap on the primary side. If the power supply is working correctly and the set shuts down, check for an open safety cap (the large 1.6 - 2Kv cap connected to the collector of the horizontal output transistor).

Posted on Aug 18, 2007


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