Hello everyone. There is an amplifier stetsom ex10500. When turned on, 2 short flashes, one long blink. I remove the resistor R127 and apply ground to the Pic, the amplifier starts up normally and works. Power supply unit 30A 14volt. At the same time, even with a resistor, I do not see a high level. Which way to look, what could be faulty? Before that, one bridge burned down. I replaced Irs, logic, checked all zener diodes and gate resistors. Thanks for the help.