Avant 55 – high frequency sound from rear speaker

[David Eyre]

All,

I have had a Avant 55 since 2014 and other than having the video card replaced the TV has worked well.

 

Recently, however, I am experiencing a high pitched frequency sound coming from the rear speaker at the back left side of the TV.  It doesn’t happen all the time, and lasts for 1 second or so.

 

I’ve replaced the HDMI cable, and swapped the Roku from connection 1 to 2, and it still makes the sound. It happens even when the volume is turned off, and seems to occur when I touch the back of the TV.

 

Any ideas on what could be causing this and how to resolve?

[jacek1313]

In one Avant, one of the power supply transformers was squeaking; at first it seemed to be the loudspeaker. A piece of plastic and varnish solved the problem.

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