Sound work on the Star Trip Pinball Table

Transistors on the SDU-1 (Solenoid Driver Unit)

I was pretty excited about the information detailed in this post and thought it would fix my Star Trip sound problem.

So I carefully unsoldered all 4 transistors and checked them.

All 4 were good....sigh.

After soldering them back in, I hoped something might have changed so I tried putting the board back in

And turned it on. The sound is still there......

Warning, the following short video has very annoying sound - this is what I am dealing with!