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High pitched squealing coming from wall a/c unit

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Sounds like a fan bearing needs lube or replacement.

Posted on Oct 06, 2009

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Hi...

Does the squeal come from the TV cabinet or the speaker?
If from the cabinet , it's most likely the Horizontal high-voltage section of the set.
Find someone that's good with hand tools,unplug the set from the wall outlet, let it sit for a good 30 minutes.
have someone open up the back of the set and dust out and vacuum out any dust from inside the set.
Put back together and try it out.

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the high pitch squeal indicates shorted component/s. the transformer goes hot co'z its being overloaded by the shorted component, it too could be the one creating the squeal!!

if you have experience with electronic troubleshooting, try to test some of the components particularly on the secondary part of the transformer.
Be careful and make sure the TV set is unplugged.
test for shorted diodes and transistors, if you're in doubt of your readings try to desoldering one leg of the diode then proceed with the testing/measuring. replace any of the bad components you find exactly with same part number or replacements with the same rating.

spend more time on it resoldering some other cold soldered components.

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