Greatings to all,
I'm finishing restoring a space invaders, and the MPU its crazy.
I do have all the led flickers ok , but after a minute it start doing some kind of self test as you can see in the video.
Yesterday sometimes didn't wanted to boot, and sometimes I got all the 7 led flashers, but then It locks, I mean no attract mode, just a number for lights turned on steady and nothing more.
All male and female connectors were changed (on the entire machine) , I have 5,2v 11v and 43v on MPU test points. All the components on the rectifier board and solenoid board were already serviced / replaced.
Removed all the ICs socketed on the MPU and installed again , with no change.
ICs sockets on the MPU are the original ones, I have not replaced them.
What is that test? and why starts after boot?
Will appreciate any help.
here is the video.