Defender/Stargate Sound Board compatibility

TheDrewster

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So I just picked up a Stargate that will be replacing my Defender soon. I got the game dead, but I have since been able to resurrect it into 95% working condition. The only issue is that the sounds are loud and distorted, barely recognizable. I noticed that it was the same sound board used in my Defender, so I swapped ROMs and boards and tried it. Sure enough the issue carried over to my Defender, but the Stargate had no sound whatsoever. Weird. So I swapped everything back in and now all the sudden my Defender doesnt play any sound either! Im thinking "Shit, I fried something...but how?" So I take a break for 10 minutes and just for fun, I turn Defender back on and the sound comes back on like nothing happened. So I swap boards and ROMs again and the same damn thing happens. The Defender sound board wont work in Stargate, but Stargate's sound board (albiet distorted) works in both machines. Then it takes Defender's sound board a few minutes to regain functionality.

Anyways...I am going to re-cap Stargate's board and see if that fixes the distorted audio, but none of this has made any sense as to why two identical boards would work in one machine but not the other. I should be able to just throw Defender's sound board into Stargate, swap the ROM over and have it work, no?
 
If they are both 8224 boards then yeah, it should be the same, as far as I can tell. I wish I could help more, but I'm still stuck in the same hole with my Defender 8224 sound board after recapping & putting new PIA chips & ROM in. I'm ready to JROK it and work on it some other year...
 
For future reference, the loudly distorted volume was repaired by replacing the TDA2002 on the Stargate Sound board. Threw on a Bob Roberts cap kit as well. Sounds crystal clear! Whoopee!
 
Honestly I just used the process of elimination. I started with the three most common failure points I knew of, being caps, sockets, then the amp. I did the cap kit, didn't change it. Replaced the sockets, still no change. Then I replaced the amp because I saw that it had a brown tinge on the board like it overheated at one point, so I replaced that and voila!
 
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