I have an older (10-15 years) Magnavox 19" color TV that is serving me
well. Recently, however, it has developed a sort of nervous tic.
Something within it is vibrating enough that it produces a noticeable
buzzing noise. If I put a dictionary on top of it, the housing is
damped enough to kill the noise, if not the source of the vibration.

When it does appear, the set has always been on for at least an hour.
But it does not always appear when the set has been on. Somewhat
unexpectedly, if the television is turned off, it takes perhaps 15
minutes to stop vibrating.

Does anyone have any speculations about cause and/or remedy?

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Thank you for your comments and consideration.

Are you sure it's not a secondary issue such as the furnace fan running, or
something? You might try setting it on a rubber mat or a towel or something
to isolate it from external sources.

WT

"Grinder" wrote in message
news:qOHod.382120$wV.381185@attbi_s54...
I have an older (10-15 years) Magnavox 19" color TV that is serving me
well. Recently, however, it has developed a sort of nervous tic.
Something within it is vibrating enough that it produces a noticeable
buzzing noise. If I put a dictionary on top of it, the housing is
damped enough to kill the noise, if not the source of the vibration.

When it does appear, the set has always been on for at least an hour.
But it does not always appear when the set has been on. Somewhat
unexpectedly, if the television is turned off, it takes perhaps 15
minutes to stop vibrating.

Does anyone have any speculations about cause and/or remedy?

--

Thank you for your comments and consideration.

Grinder:
....... and..... the model number is? chassis number?
You say this happens when it is turned off? How about unplugged too?
Might be caused by SMPS transformer noise due to high esr electrolytics?
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Best Regards,
Daniel Sofie
Electronics Supply & Repair
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"Grinder" wrote in message
news:qOHod.382120$wV.381185@attbi_s54...
I have an older (10-15 years) Magnavox 19" color TV that is serving me
well. Recently, however, it has developed a sort of nervous tic.
Something within it is vibrating enough that it produces a noticeable
buzzing noise. If I put a dictionary on top of it, the housing is
damped enough to kill the noise, if not the source of the vibration.

When it does appear, the set has always been on for at least an hour.
But it does not always appear when the set has been on. Somewhat
unexpectedly, if the television is turned off, it takes perhaps 15
minutes to stop vibrating.

Does anyone have any speculations about cause and/or remedy?

--

Thank you for your comments and consideration.

Grinder wrote in message news:qOHod.382120$wV.381185@attbi_s54...
I have an older (10-15 years) Magnavox 19" color TV that is serving me
well. Recently, however, it has developed a sort of nervous tic.
Something within it is vibrating enough that it produces a noticeable
buzzing noise. If I put a dictionary on top of it, the housing is
damped enough to kill the noise, if not the source of the vibration.

When it does appear, the set has always been on for at least an hour.
But it does not always appear when the set has been on. Somewhat
unexpectedly, if the television is turned off, it takes perhaps 15
minutes to stop vibrating.

Does anyone have any speculations about cause and/or remedy?

Are you sure there is nothing else in the building where you live that
could be vibrating at a subsonic frequency that you don't feel that is
triggering something in the TV to vibrate? If the "after turned off"
vibration happens again, what happens if you unplug the set from the
wall? It may be that the heating loosens up something that then
vibrates in response to an outside source.

H. R. (Bob) Hofmann