SOUND Broken - Good Startup, then crunchy sound - Magician Lord MVS Cartridge

Bought a Magician Lord MVS cartridge for 95 euro (25 euro shipping from Italy to France (steep!)).

In the listing it was indicated that the sound was strange, but the seller wrote: 'i think it's my mvs motherboard'. I received the game, tried it an got the following complaint:

Startup sound & coin sound are fine, game sound are crunchy and distorted

So I cleaned the contacts with white eraser - no change; then with rubbing alcohol and q-tips - no change. I carefully looked at all the solder points, and it doesn't seem to have anything out of the ordinary. However, I don't truely know what to look for, so I hope someone here could help me. Please find attached photo's of the boards, and do let me know if there's anything I can do to save this cart.

Cheers!
-Marcel

PCBs in Cart
PCBs back
PCBs front
PCB 1 front
PCB 2 front
PCB 1 back
PCB 2 back

Check all the LS174 with a logic probe. You could also replace all the logic on the board. It would only cost ya a few bucks.

bustedstr8 said:

Check all the LS174 with a logic probe. You could also replace all the logic on the board. It would only cost ya a few bucks.

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Cheers for the quick response, bustedstr8. I don't have a logic probe, so I just picked one up from Amazon. I figure it'd be handy in the future. Again, I'm rather new with anything beyond simply cleaning the board, so let me know if there's anything I'd be missing. For example: where is a good place to buy IC Chips (in Europe)?

It'd be the PROG board you want to inspect, that contains the V ROMs that hold the sound data.

madman said:

It'd be the PROG board you want to inspect, that contains the V ROMs that hold the sound data.

Click to expand...

Cheers for the advice, I'll check it as soon as I receive the logic probe and share the result.