Question about Sanyo DS31520 31" TV

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My RCA TV went blank and has a high pitch noise.

I had to unplug it to get the noise to stop. the tv does not go on or off when plugged in, only blank with the high pitch noise. Is it the pciture tube?

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It's probably not the tube. Sounds like something is shorting the B+ from the power supply. Could be the Horizontal Output transistor or the Flyback transformer. Do you know how to find these components? I could be a rectifier diode on the secondary of the power supply as well. If you know what you're doing check those with a meter. If you don't know what you're doing, ask someone who does.

Good Luck.

Posted on Jul 23, 2009

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