Reconnect the other 4, one at a time. Does one specific transistor of the 4 cause it to go into protect?
Tried individually first. Q6 causes protect, all others don't. Reinstalled all but Q6 and it powers up
I'm confused. I have Q6 pulled and tested the values of the components that appear to be in it's subcircuit
Was Q6 ever installed? The pads look like they are OEM solder when no component was ever installed?
Yes Q6 was installed, that is the one that throws it into protect. I think the solder just reflowed and that's why it looks like that
When you checked D33, did you check it for leakage (would require it be out of the circuit, or at the very least comparing the resistance across it to the corresponding diodes from the other circuits).
Pulled D33 and it's open circuit in both directions (measured up to Mohms completely open)
I've got some .5w 15v zeners if that would be a suitable replacement
I've got some .5w 15v zeners if that would be a suitable replacement
I did not initially. I tested at 20k ohms and saw open circuit both ways so then tested at 1m ohm and saw the same thing.
Tested it on diode mode today and nothing there either
Tested it on diode mode today and nothing there either
Alright diode is replaced, still having the same issue. Power supply builds nicely and then amp goes into protect. There is no PWM whatsoever going to the output fets. I'm thinking the SI8244s may have gone bad
For the two driver ICs, compare the resistance measured from pin-pin, black probe on lowest numbered pin):
9-10
9-11
10-11
Do both ICs read approximately the same.
9-10
9-11
10-11
Do both ICs read approximately the same.