I would suspect the protection circuit is bad (bad cap). It worked before??
Find what is driving the speaker protection relay. Replace the small electrolytic caps in that section. Small caps are used so that when the power is removed the relay releases quickly. Or DC is present on one or more of the amps before the relay.
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"protect" displayed on lcd screen. After several attempts of uplugging receiver
and retrying power the receiver comes on and operates normally . Found over temperature (120 f) on heatsink behind the top of display. This is possibly a power regulator and I will trace its load to locate source of excess power draw.
I will post my findings. Hope this is helpful.
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