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.

No, test with the battery too.

Could try with the one in my xenon or EbD
. Will try!

Yes I did, same results. Disconnected the coin door too.

Now I'm suspecting about connector on solenoid board, and mpu that drives the switch test button.

Quote from pinwiki

It is worth mentioning that the self test switch, which is located on the inside of the coin door and used to enter tests, audits, and bookkeeping, is not part of the switch matrix. A single signal is sent to the self test switch from the U10 PIA on the CPU board via connection A4J3-1, and returned to ground via a connection A3J2-7 on the solenoid driver board.

Will try tomorrow!

Thanks for your inputs!