Question about Sony KP-57WS510 57" Rear Projection HDTV

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No sound Sony KP-57WS510

I've had the Sony KP-57WS510 for 4 yrs.

The other day I turned on the tv and I had picture, but no sound.

I used another tv for sound and continued to watch this one, therefore, cable was not the problem here. I continued to do this for 2 days. On the 3rd day I turned on the tv and the sound came back on.

What's the problem?

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Brain Freeze ! Sometimes the microprocessor locks up...
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