I've got some strange sound issues on a Terminator 3. When I bought the game it had no sound at all. I then reflashed U8 to sound OS8 by burning a new U7 ROM as per the instructions in stern service bulletin 157.
Now I have sound but it is not quite right. It sounds possessed. Another user, elfman, has posted a video several years ago with the excact same problem, but I've not got any answer from him. Video is linked below.
I know that no boards has been swapped in this game and I've removed and verified all ROMs in a ROM reader/burner.
In test mode all ROMs sounds correct except U7. I've measured on all pins on U7 with an oscilloscope and it seems that all lines are toggling.
(The fact that the sound OS upgrade seem to have worked, 8 flashes at boot, would also suggest that all address and data lines are correct to U7).
I also measured all address and datalines to one of the other sound ROMs and that seemed fine.
I tried remove all sound ROMs except U7 as a test and the sound is still garbage in test mode.
Can anyone confirm that a whitestar board should sound fine in test mode (U7 test only of course) with only sound ROM U7 connected? This would help further investigation.
Any other suggestions?