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Re: Quick Question about power supply high pitch noise
That noise should not be normal unless it was there from its new condition. That noise seems to be there when the circuit is demanding higher current from the power supply and the transformer is trying to keep up with the demand.
How many capacitors did you replace?
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Barb, noise may be from a power supply/ transformer on it's way out.
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High pitch sound on LC-42D62 is reproduced by switching transformers on power supply board. To correct this problem, you will need to remove power supply unit from the TV, spray all transformers with SILICONE CONFORMAL COATING. Let it dry for 12Hrs. Then install power supply unit back.
High pitch noise on LC-42D62U is normally caused by one of the switching transformers on the power supply board. Solution to this problem is simple. Remove povver supply unit from the TV. Spray all transformers liberaly with SILICONE CONFORMAL COATING. Let it dry for 12 Hrs. Install power supply unit back on its place. Done.
The high pitch sound is comming from a power supply transformer that will resonate (or vibrate) at the operating frequency (12-14KHz).
This is usually affordable to repair -at least worth the estimate.
Hi, the high pitched sound is coming from the coils or transformers on the power supply.
you can isolate the noise by removing the back and with the set on press gently with a plastic handle/item on each coil till you stop the noise. , you will probably have to replace the coil or the whole power supply, but sometimes you can tilt it over or secure it with silicone and it will stop rimging.
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This sounds as if it could be a switching power supply problem or a ballast problem. Both will effect your power supply and cause malfunction in various subsystems (audio, screen control, control systems, and the like). I would suggest having a qualified TV repair technician look at the set. This is because there are no user servicable parts associated with this type of problem.
I hope this helps,