I have this MV2F slot that I repaired, and if I use the 2nd slot, I lose sound forever, like doing :
-1 game on slot2
-2 games, when I select slot2 game, sound is gone, and doesn't come back after selecting back slot1 game.
I know unibios4 has a no-sound bug with no game on slot1, but this also happens on a stock bios.
I tried swapping NEO-257s, NEO-E0s, NEO-G0s around, even swapping 257s from the graphic side, tried changing YM2610 as some signals seem to lit dim on my logic probe, and then disappear a few seconds after slot switch. The diagbios show Z80 errored/dead if trying to test on slot2 with up so I also tried another Z80 but no progress. Tried clear memory (all DIPs down), same...Even tried changing some mildly related chips like D0, I0, F0.
-1 game on slot2
-2 games, when I select slot2 game, sound is gone, and doesn't come back after selecting back slot1 game.
I know unibios4 has a no-sound bug with no game on slot1, but this also happens on a stock bios.
I tried swapping NEO-257s, NEO-E0s, NEO-G0s around, even swapping 257s from the graphic side, tried changing YM2610 as some signals seem to lit dim on my logic probe, and then disappear a few seconds after slot switch. The diagbios show Z80 errored/dead if trying to test on slot2 with up so I also tried another Z80 but no progress. Tried clear memory (all DIPs down), same...Even tried changing some mildly related chips like D0, I0, F0.