Finally got most of the sound fixed on a Stern whitestar board in a Playboy but still have one issue.

The games sound was very loud and distorted and did not adjust with the volume and I fixed that.
Replaced all the electrolytic caps, the 2 main amps, the 7805 5Volt VR, the U30 LM833 Op amp and finally it was the TDA1543 DAC at U26 that was causing the issue.

So now the sound is almost normal, but the music has distortion on all of the bass notes. When running the sound test the test tone sounds fine. The speech roms tests sound fine, the sound effects in the menu sound fine, the high notes in the music sound fine, but the bass notes are distorted. It is distorted on both the upper and lower speakers. It is distorted at both high and low volumes.

I've tried a new eprom at U7, a different BSMT chip, I swapped the two 6809 processors.
Is there a mixing resistor that adjusts the bass and treble on the board, maybe one has been damaged from when the DAC blew?

What about the 10 uf tantalum cap at C35? It's across the TDA1543 chip that was causing the main issue.

Any experts on this board?

Schematics here
http://gamearchive.askey.org/rom%20archive/pinball/Sega_Data%20East_Stern/CPU_Sound_Bd.pdf

cut the jumpers at R315 and R316 one at a time to seperate the left and right channels and issue is on both. Looks to be a pre-amplification problem. Anybody have any info on theory on the BSMT chip set-up?

gave that a shot. Didn't work.

Bump for the day crowd.

I don't think pinsound boards can work with the whitestar systems and it would cost almost as much as just buying a new whitestar board.
Not a speaker issue as it's doing this in 2 cabinets.

I'll have to see how Rob does.
Wasn't the 74LS74 chip. Got a tantatlum cap and the 2 octal register chips next. Going to try to find another DAC too.

Sent this off directly to stern to see if they can figure it out.

Had tried the board in a different cabinet with the same results.
Already tried R106 and R110.

Got the board back from Stern and they only replaced the Eprom at U36. Don't have the game here to test it yet, but I believe that I either tried all of the roms on another board or swapped the roms from another board onto this one, as well as checking the roms with my burner, so don't know how I missed this.

Yes, Sterns repair worked. They say that they replaced one of the eproms to fix it. Weird. Because I not only tested the eproms in my burner I swapped the ROMS into a different title and swapped different title ROMS into the problem board and the problem stayed on the problem board.