Hi all
I have a bally mpu for a kiss that has been converted with eproms. Board booted and worked fine up until recently. It boots properly with a 5v and 12v power supply but is locked when installed in a game with 43 volts present. If installed in a game with the fuse for the 43v removed i get the flicker and up to six flashes, reinstall the fuse and its locked on. If i turn the game in and off i will sometimes get to the fourth flash before it stops with some solenoids locking on and some controlled light locked on as well. I checked everything associated with the 43 volt circuit and it tests fine. Again, it did work before so i know its jumpered properly. Any ideas? I dont have access to an eprom burner or another set of eproms.

Thanks for the notes guys i feel honoured that two pinside heavyweights chimed in!!!
I'll send pics of the board. Clean as a whistle, no acid damage as far as I can see
I've replaced all the suspect resistor diodes etc. any chance either of you think an EPROM went for a loop?

Forgot to mention, I removed the sound board. Also forgot to mention. I also have a spare kiss board (regular stock, no EPROM) that boots up fine so I know it's not the power supply driver board sound board etc....

So let's play this one out. No .25 volts. I put the multi meter on the dc setting and connected the red lead to u14 pin 4 and black on u 10 pin 18 and didn't get anything. What's next?

Thanks for your help far bud. Everything checks out for voltages. Guess ill have to put in a new u14 and reply back. Thanks again