I am having a problem fixing a sherwood RV-8070R AV amplifier. There is no sound from both the A and B Front Speakers. The centre speaker and rear speakers are working fine. I opened up the output board and found that all the output and driver transistors are OK.The front display is working fine. I can see only one relay which is meant for switching the power supply. The front, centre and rear speakers do not have any relay. Are the front speakers switch on by the microcontroller. Pls help.
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