Question about Sanyo DS31520 31" TV

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Sanyo tv making high pitch noise from loose cable connector

My tv makes a real high pitched squeal when on. If I mess with the cable connector on the back of the tv in gets better and sometimes goes away. Im guessing its a loose connection How can I fix it?

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The noise is coming from the fly-back transformer. By moving the cable connector you move the main board. Unplug the TV and remove the back. The transformer has a red wire going to a rubber cup at the top of the picture tube. Looking at the transformer you will see a dough nut shape with a metal piece going through it .. Drive some tooth picks between the dough nut and the metal core. That should reduce or stop the ringing.

Posted on Apr 21, 2008

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Hello,

Sorry to hear about your issue, let me see if I can help.

What type of tv is this? tube or flat panel? If tube, have you recently moved it and shook it up a little?
If panel, are you using an hdmi hookup or just regular cable from a cable box?

Be sure that your hookups are on tightly and that your cables are not tangled as well especially hdmi cable. Let me know if any of this is helpful in solving your issue or if I can be of more assistance. Once you respond I can help more, just need more information..

Thanks,
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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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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!!

barneyluc

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is the squealing noise from the back of ur set , if so it is ur flyback transformer

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It always nice when the high-voltage circuit gives you fair warning of impending doom. Have the high-voltage (flyback) transformer replaced now before it fails catastrophically and wipes out other stuff with it. There are other things that could make noise too, same advice applies to them.
Hope ya fix it!

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In this model the horizontal drive coil vibrates and makes a high pitch squeal. Most times it is intermitent. Touching on the coil with something (non electrical, like wood) will make it stop or change it's pitch. The fix my shop uses: It's not to technical, but, we put fingernail polish around the coil. It's a remedy I've used for decades and has always worked. Some shops use a hot glue gun. With the back open you can hear the coil to locate it. When fixing the problem have the set unplugged. When a technician is working on a television while it's plugged in. He uses only one hand and stays away from the high voltage.

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