The amp chip may have blown. inside at the back near to the fan there is a big chip look for a crack in the top of it. can feel if it if it is at fault using your nail. if feels ok there is a row of chips check these with a meter making sure they all the same meter readings. also check the fuse's in side, and make sure the fan works as this can fail and the amp will over heat and shut down. or blow capacitors.
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