dandydan1959
New member
Hi Guys,
I have a williams Blackout that the MPU board is locked up. No lights no flash. I checked CPU pins and pin 31 is low and all the rest of the databus pins are pulsing. Pin 31 appears to be D2 or databus 2. I am not sure where D2 is initiated so the reason for my post. All of the address lines are pulsing. The problem started with the cpu booting up as if the cmos was not holding memory and displayed the game number in the display. I could bring the game up by toggling the power switch The next change was that occurred was a stuck on slingshot. I had checked batteries and replaced them along with making sure the voltage from the pack made it to the proper pins on the board. After making these checks the problem of no cmos memory remained. Then it went in to death mode. The 5101 is soldered in so I am going to order a couple of these and a couple of sockets. I am running the board on the test rom and on a test bench with power applied and still no flash. I assume I need to get the 5101 out and changed before I go further but if you have any suggestions let me know.
Thanks
Dan
I have a williams Blackout that the MPU board is locked up. No lights no flash. I checked CPU pins and pin 31 is low and all the rest of the databus pins are pulsing. Pin 31 appears to be D2 or databus 2. I am not sure where D2 is initiated so the reason for my post. All of the address lines are pulsing. The problem started with the cpu booting up as if the cmos was not holding memory and displayed the game number in the display. I could bring the game up by toggling the power switch The next change was that occurred was a stuck on slingshot. I had checked batteries and replaced them along with making sure the voltage from the pack made it to the proper pins on the board. After making these checks the problem of no cmos memory remained. Then it went in to death mode. The 5101 is soldered in so I am going to order a couple of these and a couple of sockets. I am running the board on the test rom and on a test bench with power applied and still no flash. I assume I need to get the 5101 out and changed before I go further but if you have any suggestions let me know.
Thanks
Dan