After 30+ hours of troubleshooting (using all of the other great threads with the same issue), im finally posting to try to figure this out.
When engaged, light goes on, clean signal passes through. Mix knob seems to be the only one that does anything– when turned all the way to the right, volume goes up a bit. And yes, I turned the trim pot slowly, no effect. i will follow up with pictures shortly, but wanted to highlight something i noticed while using a signal tester that was not mentioned in any other thread.
The signal goes dead on the left leg of the Q7 (leg closest to left edge of board), and the top leg of R28 (resistor right below Q7) also is dead here. Signal works everywhere else.
Schematic:
http://byocelectronics.com/schematics/p ... ematic.pdfOther tidbits....
IC pins voltages look relatively close to where they should be
Reflowed all joints multiple times
Any immediate thoughts on what to do from here?