Help with rockford 1501bd

[stoke]

hi, i replaced on this amp 4 irf6215 and 4 irf3415, now the amp power up but makes like a oscillation noise on the circuit board and there some current excess flowing.

[stoke]

i leaved the amp on for a few seconds and blew up some output transistors

[Perry Babin]

Did you check the gate resistors for the outputs you replaced?

[stoke]

yes, all ok

[Perry Babin]

Do you have an oscilloscope?

[stoke]

no

[Perry Babin]

Remove the defective output transistors.

Discharge the rail capacitors by shorting between the twisted red/black wires with a dummy load resistor.

Measure the resistance between leg 1 of the MIC4420 and the other legs of the MIC4420 (nearest the blown outputs). What's the lowest resistance you read between those legs.

[stoke]

on U6 with pos on leg 1

2=290
3=1.75k
4=300
5=0

[stoke]

on U6 with pos on leg 1

2=290
3=1.75k
4=300
5=open

[Perry Babin]

That seems about right. I don't know what else you can do without a scope. It could be that you damaged them when you soldered them to the MEHSA insulator and that what caused their failure. To find virtually any other problem, you'd need a scope to check the drive waveforms.