It seems as though your receiver must have some sort of thermal overload protection or short circut protection that is shutting down the amp section. Maybe there is a short in the interconnects between the TV audio out and the TV input on the HK. I would try swapping out the ICs with ones you know are OK. Otherwise, you may need to give us more info on how your HT is wired up.
Harmon Kardon + TV = no sound after 5min
I have a Harmon Kardon AVR300 receiver hooked to a Sony TV - when I try to listen to the tv through the receiver I'll get about 5-10 minutes of audio and then the receiver will shut off....if I am just playing music through a CD player or tape cassette this does not happen. Any idea why my receiver is cutting out when I run the tv audio through the receiver???
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