My radio report dc error on the log.
OLERR is over load detect circuit. Also i try to manually lock the fan and the radio will shut down after 2 seconds.
Did you check the 5 volts regulators on the amplifier board? there is two of them for +5 volts
Can you check the dc voltage on the speakers terminals in your radio, mine has +1.8 volts in all of them.!!
Im suspecting also those drivers IC. I think Newark electronics have them in stock for like 3$ a piece
What bugs me is that 15 volts line, if i check taking the regulator ground as reference then the voltage is ok, if i use chassis ground then show 50 volts on the pin 12 (VCC) on the driver ic .IRS2092SPBF Maybe a floating voltage.