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How to get rid of An piercing underlying noise from the tv.

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Replace the power pcb and digital pcb.try power pcb first.could be caused by either board.

Posted on Jul 28, 2009

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Funai tv. When plugged in, makes ear piercing high pitched buzz that goes away when unplugged. Will not respond to buttons. No picture or power. Already replaced power board. What now??


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Hi I have a very annoying, ear piercing high frequency pitch coming from what seems to be the television. However, I was trouble shooting and based on the cable technicians thought; said to be the...


Hello
The LOT [Line Output Transformer] of your TV has damaged. It is the one, that supply all the voltaged needed to CRT. Its internal windings will get shorted in between, and is irreparable. Replacement is the only remedy to this proble. Replace the horizontal output transistor also with this. you haven't specified whether there is picture with your tV or not. If this high frequency sound is along with picture, there is some loose in the cores of the SMPS transformer, or LOT itsef. If there is no picture at all, and this high frequency sound is there, no doubt; LOT is damaged. OK.

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I also have an issue w/my RCA rear projection TV making a piercing sound. My TV does not do it on the HD channels, but does make the noise on the regular cable channels and on On-Demand as well.
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