Question about Panasonic CT-36D31 36" TV

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High Pitched Noise, No Picture, Need To unplug to make it stop

My TV is doing the same types of things that another member said was happening to their 42".  I am under the impression that it is the horizontal output transistor and transformer based on a previous posting. (thank you techman).  My real question now is, 

Where can I find these parts so that I can make this repair? 
My car is too small to take this TV anywhere and I feel my only worthwhile option is to make this repair myself.

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Re: High Pitched Noise, No Picture, Need To unplug to...

It is probably easier to take it somewhere to have it fixed as you will spend hours and still might not fix it correctly.

You need schematics for your TV.

If you really need sources for these parts, you might be able to find them from digikey, mouser or newark electronics.

Look on this link for more repair hints for HOTs


Posted on Oct 31, 2007

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Same problem, high pitched noise over regular sound and no pictur

No guarantees with this diagnosis. But it sounds like an HT ( high tension) leak This is often caused by the lead becoming partly unplugged ( being bumped or moved) and because of dust buildup it arcs making a high pitched hissing whistle.Ther lamp may also have been affected by the HT leak. The safest option for you is to call a service technician to it, as opening it up could cosntitute a a danger to the unskilled.

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When my rca 36F530 tv is plugged in it makes a high pitched buzzing noise picture does not come on

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High pitch

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!!


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1 Answer

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1 Answer

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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.

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2 Answers

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that high pitch is comming from the flyback replace the flyback and the HOT.and you will restore back the life of your tv.good luck.

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3 Answers

High Pitched Noise

most high pitch noise comes from the anode conection on the picture tube thats connected to the flyback anode cap thats mean there is a high voltage leak,to stop the noise you can discharge the high voltage take off the cap and clean with alcohol.if the noise will have to put some red or clear silicone both the cap and tube stick together leave to dry for about 2 to 4 hrs.this will eliminate the leaking.good luck.

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1 Answer

TV won't stay turned on, no picture, started making high pitched noise

That high pitched noise you're hearing is the power supply telling you that it has too much of a load on it and lowered its operating frequency which in effect cuts its output way down! Normally you don't hear any thing since the power supply operates at a frequency that's beyond human hearing. In an RCA this indicates more than likely that your horizontal output transistor is shorted and this short was caused by the flyback transformer shorting. This is a common happening with RCA's You'd need to take to a tv shop and have it checked out. Stargazer

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