have a white water pinball with WPC boardset.
works for about 5 minutes then reset come back on, reset until it's continually resets.
It's the display board is causing the MPU board to blank. disconnecting the board J601 connector causes the rest of the system to come back online and stay that way.
5 volt is good at 4.97
blasted all the chips on the display board with freeze spray one by one to see if it would come back but no luck. even tried with the flipper and sound boards disconnected and still blanks out.
the only way it seems to work is if i leave it off for a while and power it back up or disconnect the diplay board.
tried a different display board (it has line and page errors) and this one works fine (or as fine as it can with page errors)
any ideas what it could be? I'd like to get this display board working, I only just rebuilt the high voltage section in this one.
also if you know what is causing the line/page errors in the other board (already replaced scratch RAM) I'd entertain that as well.
TYIA