Mega Drive 1 Sound Issue

[SILEeeles]

Thanks, I'll check that out soon

[Chibisteven]

Thanks, I'll check that out soon

Hope it goes well.

[evildragon]

This is an issue with the z80 sub cpu or something related to it. Sonic1 works because it uses a sound driver than runs on the 68000 for the most part.
Though most games use the z80 for everything sound/music tasks, so a flauty z80 subsystem could result in most games having noise/beeps & bops/silence

Looks like a trace/pin running to/from the RAM<->z80<->IO chip is busted

Good catch!

[SILEeeles]

Top side of the board appears fine, so i followed the traces that go to the back of the board and I discovered this:

Image Link

I guess the fix is finding where the traces lead and solder them with wire, the smaller 315 chip it looks like.

I say the smaller one, I've just noticed there are two small 315 chips lol. The one the traces lead to is the 315-5364, next to the cartridge port and the bigger 315-5313A chip

[evildragon]

Link don't work.

[SILEeeles]

Fixed, but not as big as it should be. I keep getting that invalid link in a lot of places. Oh well.

[Chibisteven]

Top side of the board appears fine, so i followed the traces that go to the back of the board and I discovered this:

Image Link

I guess the fix is finding where the traces lead and solder them with wire, the smaller 315 chip it looks like.

I say the smaller one, I've just noticed there are two small 315 chips lol. The one the traces lead to is the 315-5364, next to the cartridge port and the bigger 315-5313A chip

Looks like you found the bugger.

[Drakon]

Too much blast processing blasts the pcb traces.