Question about Zenith P42W34P 42 in. EDTV-Ready Plasma Television

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Buzzing i have a unit that buzzes when looking at the back of the unit it is the board on the right. power board. set was repaired once lasted about three hours, then buzzing or humming came back. it is not the back cover it buzzes with the cover off. thank you bsc

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  • Zenith Master
  • 5,568 Answers

I suspect it is a transformer or inductor although most are now ferrite instead of laminated iron, they can have windings not properly potted.

You can try a variation on an old mechanic's trick.
They (and I have) used a screwdriver, placing the tip on various sections of the engine and the handle on the bone right behind the ear.
Many warning sounds can be located this way.

DON'T use a screwdriver but a length of unpainted wooden dowel, or, if you have a length of nonconductive plastic, in the same manner, placing the 'input' end on suspect parts and the other end behind your ear.

Look especially for larger parts on the power board; these will be transformers or filter inductors.
Smaller parts are not likely to make any noise at all.

Make the dowel long enough so you can stay well clear of any part of the set since it will be necessary to have it powered up to locate the source.

If you are able to locate it, turn the power off, unplug the set and force some epoxy into any cracks or openings you see on the (?) object.

Happy hunting-

Posted on Jul 09, 2008

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If you need more assistance, Then email me at Delhielectronics@live.com
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