You will have to trace out what is supplying the input signal to the LM1875.
Most probably one of the opamps.
Use the schematic that I attached to verify what input pin they are using. (Pin 1 or 2)
It should be a capacitor coupled input (C12?)
If so, you can lift that cap to isolate the LM from whatever is driving it.
(this may be called for if the LM is toast & dragging down your supply signal)
Most probably one of the opamps.
Use the schematic that I attached to verify what input pin they are using. (Pin 1 or 2)
It should be a capacitor coupled input (C12?)
If so, you can lift that cap to isolate the LM from whatever is driving it.
(this may be called for if the LM is toast & dragging down your supply signal)