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HT-F6500 front right speaker stops working after a few minutes and emits a knocking sound?

(Topic created on: 10-01-2021 02:17 PM)
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ADB100
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I have a HT-F6500 BluRay surround sound system.  Recently the front right channel has developed a fault.  Its not the speaker as I have moved speakers and the fault follows the channel rather than the speaker.

It works fine when first switched on, however after a few minutes the front right channel stops and there is just a feint repeating 'knocking' sound.  If I switch it off with the remote and then back on again it works for a few minutes, however after 5 minutes or so the audio stops and then this 'knocking' sound returns.  If you mute the device the knocking sound remains.

If I switch it off and then on and go to audio settings and run the test tone I can hear the tone on each speaker OK, however if I do this when the fault is happening the front right doesn't emit the tone and I just hear the knocking.

I suspect it is the hardware that has developed a fault.  Is it repairable?

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