Check it without speaker connection. If the set does not go to protection mode, check all the speakers by connecting one by one at a time and switch the set ON; to find the faulty speaker. If the set goes to protection mode even no speaker connected, check and replace damaged components at its audio output section circuit. If you wish to get some details; check the site linked here.
Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
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