Question about Sharp 32SC26B 32" TV
I have never heard a tube make noise when there is a good picture. Anyway, the noise has to be a transformer ringing or oscilating. They make a high pitched squeal when they have a loose winding or their cover is loose. You probably won't be able to feel or see anything loose on these transformers The power supply switching transformer is the first to look at. Take a hot glue gun and just cover the thing...especially at the base of it. The next (and only other) one is the horizontal drive transformer.It is located close to the high voltage transformer( biggest thing on board and usually in back or corner of the PCB.This one wont squeal) The horizontal drive transformer is about the size of a large marble and is encased in a black plastic cover. Cover it with hot glue also.
If you take the back off you will probably be able to localize where the squeal is coming from. You will probably need a signal to hear the noise also. After you find where it is coming from UNPLUG the set before doing any hot gluing!!!!
If you 're not up to this procedure take it to a technician. Your tube is not going bad and the set is definitly worth repair. Simple fix!! Good Luck!!
Posted on Oct 03, 2008
The high-pitched noise in some CRT type sets can either be a transformer in the line drive stage, the power supply, or the deflection yoke on the back of the tube itself could have vibrating windings. Picture tubes as a rule, generally do not 'whine'.
My experience has shown it to be mostly the yoke which causes the most trouble, and leads people to believe their tube is going out.
Rather than replacing the yoke, which isn't cost effective, you could carefully remove from base of tube, dip it in varnish (masking the areas which make contact with the tube of course as well as the rubber caps) this should secure the windings and stop the vibration or 'noise'.
BUT you MUST be aware of its original alignment to the CRT before you undertake removal. This works for Philips sets with loose yoke and small transformer windings.
Hot glue works on small chokes/transformers on the main board though, so you can try that also, but you must be exceptionally careful while doing so, and only use a small amount.
Only do this if you are prepared to accept any risks involved.
Posted on Feb 15, 2011
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