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I have a panasonic viera TH-58PZ700U Why am I hearing a high pitched humming sound when I turn it on I did a vusual check of the boards and capacitors ?

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There are many reasons for this fault. Your TV need a through check-up. Contact any service technician. This is not a user repairable fault.
Its power supply section circuit should be checked. Usually; a hum sound can be with any fault filter capacitors on it. But can't say; it will be. As I stated above, there might be any other reason that this. I think that you can get me. In fact; trouble-shooting should be started from the main power supply regulator board itself. Ok?
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Posted on Dec 10, 2014

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Hello
check its power supply regulator board for any loose solderings.
This is the picture of the power regulator board to your tv. Normally there is no repair for this board, and if it is found faulty, card base replacement can be done. If there is some loose soldering contacts, it can be resoldered by applying a little more solder. that is all. OK.
1_20_2012_5_29_06_am.jpg

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