Question about RCA F35317 35" TV

4 Answers

High pitch sound coming from circuit board, cannot

Cannot power up RCA F35317 35" TV
High pitched sound coming from circuit board area

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4 Answers

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  • Master
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If this is a regular CRT tv or a tube TV, seems to me an axed Horizontal Output Transistor. Its commonly the one that makes the high pitch whine on CRT tv. Some other are the SMPS transformer.

Too summarize you could be either have a short/fault on high voltage section or power supply side circuitry.

Hope it helps.

Posted on Sep 27, 2009

Testimonial: "Appreciate the heads up on this problem, will test the horiz and other related transistors. thanx"

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Ur high voltage is dead,the FBT,the flyback transformer is dead.The big block plastic with a red wire with a cap that hook to the CRT(tv tube).That thing have a piece 5' steel like a paper cliff gap air voltage go through make that high pitch noise.

Posted on Sep 27, 2009

Testimonial: "Your nfo has been very helpful, i had suspected the FBT ,thanx again Guru"

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  • Contributor
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First, you will want to isolate the problem. Is it feedback from an AC outlet you have it plugged into? Is it a recent noise that just started with no changes to Tv or its environment, then you may want to consider that a circuit is going and decide if it is worth repairing, You should find that type of fix at a shop for under $100

Posted on Sep 27, 2009

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Note: the high voltage section of your television can shock you with enough current to kill even after it has been unplugged for a year, so it is not advisable to work on them unless you know what you are doing, the pro's use a ground strap at the elbow of the arm they are using while the other arm is far away from the circuitry

Posted on Mar 25, 2015

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