Injecting audio signal at gain pot wiper has no effect,
Chris
This seems to show that something is wrong after the pot.
Q7 failed? Shorting to ground.
And if not give us the actual voltages at Q7 and IC10
Left overnight, switch on, worked for 3 or 4 minutes
This makes me think of bad connection somewhere, but maybe not.
Probably entirely unrelated, but LCD pins 7-10 show ~4.96v not ~1.08.
Not sure, possibly due to good meter, not the integral one that is low impedance, that's what the troubleshooting gives.
73 Alan GZFQ
