hello out there! been looking thru topics to find help repairing SP.. after years of faithful service, the sound has disappeared..
back story: the cabinet speaker & grill were destroyed by a child long ago, finally got around to replacing them about a month ago, probably not related?
the game has been functioning great until a few days back, the sound got really loud, then quiet, then reaaaallly loud, then gone
what i did: after checking the basics, i swapped in the cpu / sound from monopoly, changing the eeproms U7, U17, U21, U36, U37, U210
however: my intention was to work on the cpu on monopoly at home, since SP is about an hour away. problem being the rev d board apparently isn't
compatible with monopoly (anyone refute?). so i drove back there today, swapped the eeprom's back into the original board, and swapped one by one
all the socketed ic's U4, U6, U9, U209, U212... none of which seemed to be the issue..
so i know it's a board problem, i know it's not the eeproms or other ic's i swapped.. machine voltages must be fine..
i'll be heading back there wed / thurs to have another look, & would like to be armed with as much info as possible
thanks for any help