disconnect power to the amp modules and see if power supply works fine. If yes then it is a fault on an amp module. Can you connect one module at a time? Find the bad board and then see if any mosfets are bad on that board. Was a fuse bad? If so this output side may be blowing fuses due to shorted mosfets.
looks like this one is ready to be sent to your dealer.... i am repairing a digam Q4004 and still, after replacing resistors, driver ic's new mosfets, source resistors, etcetera etcetera , still no luck , these types are too complex to do it yourself. and by the way..... it looks as if they still use the same kind of driving and decoding to do the PWM for the mosfets??
