Bass 8k not building power supply square wave

[EXPANDINGFOAM]

Both are 18k ohm

 

[Perry Babin]

For the IC that still has all components in the board, do you read 11k from pin 9-10?

 

[EXPANDINGFOAM]

Yes 11.18k ohms

 

[Perry Babin]

As of now, when the transistor that was driving it into protect is out of the circuit, do you have drive into the driver ICs?

Do you have output from any of the 4 output drive channels of the 2 ICs?

 

[EXPANDINGFOAM]

No drive input to IC4. IC2 seeing 4v DC on pin 1 PWM input

No PWM on any output of either IC

 

[Perry Babin]

DCV on pins 5 and 8 of IC12?

 

[EXPANDINGFOAM]

Pin 5: 7.49v

Pin 8: 15.0v

 

[Perry Babin]

If you bridge pins 1 and 2 of IC12 with a meter probe while monitoring pin 1 of the driver IC, does that bridge give you a signal (whatever you're driving into the amp) at the input of the driver IC?

 

[EXPANDINGFOAM]

No input on pin 1 of either drive IC (IC2 and IC4) with pins bridged on IC12

 

[Perry Babin]

Do you have audio on pin 14 of IC17 and on pin 7 of IC12 with both at approximately 7.5v DC?

 

[EXPANDINGFOAM]

I have 7.8v DC on both of those pins but solid DC, I don't see any audio signal if that's what you're asking

 

[Perry Babin]

Are you driving a signal into the amp?

Do you see audio on the output pins of any of the op-amps in the preamp section?