My Spider-Man PCB developed a fault where some voices were missing (eg. character announcements on the player select screen), music was janky and some of the in-game sounds were off; they were either playing incorrectly or missing some layers.
1. Went into the PCB test mode and performed the "Memory Test" which all passed as "Good".
2. Went to the "Audio Test" menu and indeed that some of the "Music" options were playing with clicks and some of the "Voice" options were missing.
3. Read the MAME driver and confirmed that IC35, IC31, IC26, IC22 were the chips related to sound.
4. IC35 dumped and romidented correctly.
5. I couldn't get the other three Mask ROMS (IC22, 26, 31) to read on my burner as they had floating pins.
6. Burnt three fresh 27C040 with the files from MAME
7. Plugged the board in, and it's working now as expected.
Gotta say, I was expecting the worst, but this was one of the easier repairs I've met with of late.
A reminder to always start with the basic step of checking the data on the chips before diving deep.
1. Went into the PCB test mode and performed the "Memory Test" which all passed as "Good".
2. Went to the "Audio Test" menu and indeed that some of the "Music" options were playing with clicks and some of the "Voice" options were missing.
3. Read the MAME driver and confirmed that IC35, IC31, IC26, IC22 were the chips related to sound.
4. IC35 dumped and romidented correctly.
5. I couldn't get the other three Mask ROMS (IC22, 26, 31) to read on my burner as they had floating pins.
6. Burnt three fresh 27C040 with the files from MAME
7. Plugged the board in, and it's working now as expected.
Gotta say, I was expecting the worst, but this was one of the easier repairs I've met with of late.
A reminder to always start with the basic step of checking the data on the chips before diving deep.