You need to swap the two plugs: sound volume and black wires(speaker). Your picture shows them reversed.

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Great to hear! I can honestly say i couldn't hold a candle to most of the help here. I bought a storage unit years ago including tons of system 3-7 mpu and sound boards. Since I had zero electronics knowledge they sat for years. When I needed system 6 and 7 boards I dug them out. The cool thing was since I had so many, I was able to do the swap everything out (roms, chips, transistors) trick until something worked. Slowly, I mean slowly, It started to click. I bought some of siegecraft electronics(Hans is the man!) tester stuff, desoldering iron, and finally a probe. I managed to repair almost all the boards that looked totally nasty. I learned a ton and have not found a firepower I couldn't fix. I can basically walk the most clueless person through a repair over the phone. I actually enjoy board problem solving now but can only take it in doses. Glad your good to go!

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