I am looking for a little help. My fire power will boot and briefly display 1492 2 in player one with 0 on all other displays. Quickly only player one and credit/ball display remain on. Player one will blink out some gibberish, credit shows 4 and ball in play will count 1 to 40 and keep looping through this count. The machine has been working good for awhile now with the exception of column 8 lights stuck on. I just replaced the pre driver with mpsa14 transistor. I played 2-3 games with no issue. Column 8 lights were working. I shut the back box put the glass on and this crazy behavior started. Today I have changed the one remaining scanbe which was the cpu, other scanbe sockets were changed a couple months back. I swapped in new 5101 and new eproms. no change. Game boots normal, both LEDs blink on and go out. On board williams diagnositc and both led blink 2 times and go out. I took out the eproms and put in leons test prom. LEDs blink. I used my logic probe on all PIAs and they all check normal, pulsing input and output. I have 5 volts on blanking circuit on both mpu and driver board. 40 way board interconnect on female side previously replaced and reflowed male pins. What else could be going on?

I have only changed one connector. Voltages all seem fine. You still think connectors? I can sure swap them and see. It sort of goes along with dying after board removal. This still does this with all driver board connectors removed.

the one I changed was upper right for displays

I changed 1j1 and 1j2 and it is still doing the same thing. I am starting to thing that the "4" in the credit window is test 4. So it comes up briefly into test and that is why the 1497 2 is displayed and it then jumps to test 4. I am thinking about ordering a new IC1. Any other ideas?

leon's ram test passes. disconnecting 1j4 does nothing. I only changed the 1j2 connector, not pins. I did reflow them. They are shinny. I could try that. This board had no battery damage at all.

I changed out the pins, tested the diodes and checked TP7 (4.8 and 3.0) Any other ideas?

something else I noticed. Pushing credit will stop the counting in ball in play. I am temped to replace ic15.

Just getting back to this after christmas. The PSB has all new caps. Larger diode upgrade. No 5v or ground tie together, I did not see that in a guide. The speech board boots and works every time and what I read was that indicated PSB is probably fine. Not sure if that is true. New female 40 pin connectors. Reflowed and clean 40 way male pins.

I burned a new set of roms and tried them

just a quick look with the logic probe and 7, 12 and 27 all have highs lows and pluses on various pins. 24 pin 12 and 13 have nothing but appear unused in the schematic. There are however no pulsing lines. Is that normal?

I have tried new 5101 and no change. I would not call it crashing. It seems like it started in audit and goes to test 4 and starts counting. It just keeps looping 1-40.

I tried this and pin 6 and 8 are working as you describe.

ic12 pin 8 low unless i shut the door then it pulses.

IC27 power off, button cell showing 3 volts installed. Getting 2v on pin 2 and 2.8 on pin 3.

should I see pulses on pin 38 and 39 of IC1? They show low on the logic probe. They also only show 1.2 v

I have the boards back on the bench and re running leon's test. Pin 18 of the switch PIA basically shows low on probe. There is the lightest of flicker on the yellow light with no tone.

all 4 PIAs on pin 18 act like that so I guess it is normal

Well, after running through all of the leon tests and everything passing again, It is back in the machine and working. I made no repairs at all. I can only think a flec of solder, poorly seated chip or something. Thanks for the help guys.

where can you get Andre's rom?