Daytona 2 refurb lingering issues

[hellocomputer]

I made a speaker wire to go out of the M3 board to an external amp to see if FX were playing. sure enough, they are. So M3 board is ok.

So I made a cable like above and tried to play my iPhone through the amp out the speakers, but nothing. Absolutely dead. Now I'm not hearing any static whatsoever.

The LED on spare amp I bought doesn't light up. In fact it doesn't light up on the original amp either. Is this just the design? It is getting 14V.
Regardless, I still have no sound on this thing and it sucks. I need something else to try.

Also this board has lots of corrosion on it, so maybe this thing is a dud?

 

[hellocomputer]

ok. I cleaned up the amp and now am getting some popping sounds in the front left channel (engine left) if I wiggle the lines going from CN6... these three lines lead to the front POT. Swapping CN5 and CN4 and I hear (seat left) popping. So the amp is doing something. lol. Maybe I should try and replace the rear pot.