It a control switch and power supply that needs to be replaced they have blown.
get in contact with me so I can help you financially...I can buy your unit for parts.
It will cost more than the unit firstname.lastname@example.org
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try plugging in headphones and unplugging them. the headphone jacks have a tendency to have a shorted contact in them that cause the unit to think there are headphone plugged in all the time. Only true fix is to replace the headphone jack, but pluggin and unplugging can temporarily clean the fault usually.
You either have an overloaded output or a shorted powersupply. If you have verified that your connections are not the cause then the problem is internal and will require service from a trained technician. Switching power supplies are notorious for going bad. Two of the main components are the FETs used for switching and the PWM generator.
go into the settings menu and do a sound test using the recievers pink noise tester to test each speaker connected, if while doing this test you still get no sound from those two speakers check connections, make sure speakers are not blown.
if speakers and connections are good then the reciever needs repair
try to introduce your speaker one by one and check every time you enter the speaker check for bad cable(internel short)open cable cover and touching of adjacent cables together.-try to change the position of your speakers.