Pin 1:4.37
Pin 2:4.38
Pin 3:13.88
Pin 4:0.12
Pin 5:1.97
Pin 6.4.35
Pin 7:4.95
Pin 8:4.95
Pin 9:4.95
Pin 10:4.95
Pin 11:8.21
Pin 12:0.00
Pin 13:4.66
Pin 14:0.00
Pin 2:4.38
Pin 3:13.88
Pin 4:0.12
Pin 5:1.97
Pin 6.4.35
Pin 7:4.95
Pin 8:4.95
Pin 9:4.95
Pin 10:4.95
Pin 11:8.21
Pin 12:0.00
Pin 13:4.66
Pin 14:0.00
Will it produce audio if you lift D4?
With that diode lifted, what's the DC voltage on pin 9 of the 339?
With that diode lifted, what's the DC voltage on pin 9 of the 339?
One of the output channels of the 339 may be leaky.
If you have it, replace it and resolder the diode.
If you don't have one, lift terminals 1, 2, and 13 with the diode soldered in to see if the amp will produce audio.
If you have it, replace it and resolder the diode.
If you don't have one, lift terminals 1, 2, and 13 with the diode soldered in to see if the amp will produce audio.
Resoldered a couple legs on the 339
Pin 1:4.68
Pin 9:4.94
With D4 back in circuit amp will not produce audio
Pin 1:4.68
Pin 9:4.94
With D4 back in circuit amp will not produce audio
Lift Q3 to see if that allows the amp to power up.
Resolder R12.
The amp won't power down with remote with Q3 out of the circuit.
Resolder R12.
The amp won't power down with remote with Q3 out of the circuit.
With q3 removed amp still won’t power up .
I still get all the same voltages as before with Q3 out
I still get all the same voltages as before with Q3 out
I don't see any components that can be preventing R12 from pulling D4 up. A leaky 339 could do it, but you replaced it. Q3 could possibly do it but it's out of the circuit. C2 sometimes fails but the voltage on pin 9 rose above the 5v reference when you removed the diode.