Sorry....I only just figured it out the other day and haven't really gotten to take time to elaborate yet....
Quickly summed up:
After reflowing connectors, doing cap kit, replacing DAC chip, replacing amp chips, etc.....
Problem was a defective wire in my new Pinball Pro speaker kit.
I couldn't figure it out right away (well.....HOURS and like 40 bucks in parts), because when I hooked original speakers back up, I had same problem. So I SWORE it was in audio/amp board.
Well, what I DIDN'T think of.....I used the new wiring that came with Pinball Pro speaker kit when I temp hooked up original speakers to retest.
Turned out wire going from their volume pot to the speaker actually had a break in the conductor somewhere in middle of wire...not either end (I cut both ends and checked continuity of wire)!!!
So I took all their wiring off, redid with nicer joints/soldering etc and added shrink tube over each terminal lug like it should have. Also added a few cable ties for cable management as when I reassembled, the excess wire (I cut my new wiring to same length as original ones on speaker kit) kept wanting to drop down thru backbox holes and hang in view from playfield.
Only thing left to do is replace their connector with a full width one, because I don't like leaving 2 male pins ( even if not used) exposed and just hanging off a cable behind my HV DMD boards...
Not sure if they fully test their kits before shipping, and I will say they are very nice when I have talked to them previously (have not discussed this problem with them yet), but I have a punch card of several more small issues with this kit for the cost that I will politely bring up in another post soon (including little things like why a 200 dollar kit can't at least come with a 25 cent printout of instructions vs having to go online to view generic ones)...
This "short" post is just one since you asked.
Thank you guys for the help in trying to figure out the problem!
Couple quick pics....should have taken more.
No shrink tube.
Exposed extra pins risking shorts to other boards VS using wider connector.
Redone wiring (writing on pot was for my reference) with zip ties instead of shrink tube as strain relief, but also shrink tube used on lugs.
Small cable management by my choice.
Also, showing tape on connector to cover exposed pins for now until I can order correct width connector and replacement pins.
Again, I have not reached out to them yet and am not talking trash....just showing my work.KIMG3959 (resized).jpgKIMG3960 (resized).jpgKIMG3966 (resized).jpgKIMG4026 (resized).jpg