Assuming this question is also about the STR-DE695, there's a short circuit according to page 56 of this manual: http://www.fixya.com/support/p224379-sony_str_de695_6_1_channels_receiver/manual-16200
SOURCE: My car stereo flashes the word "PROTECT"
If this happened while playing music at a little higher volume, you must check the speakers for short in coils. disconnect the speakers to see if the protect condition changes, if so check the speakers and wiring. If not then you must have blown up the output IC or a power shorting within the set. You will have to remove the pcb disconnect the power to the output IC to confirm the fault. Helpful I hope. Good day
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