Williams system 6 Laser Ball
Solenoid 2 shorted out blowing out Q16 and resistors. Looks like it also took out solenoid 1, 3, and 4 transistors and resistors. I pulled the driver board and replaced the bad components. When I placed the driver board back in to the machine, I noticed that I had 2 solid red lights and the MPU will not boot up. It will not boot up with a test room either.

What chip on the MPU is comman to the blown solenoid that I can test or pull?

And what would cause a solenoid to have a dead short?

Tried with the driver board remove and still have the 2 red lights. I even went as far to remove all socketed chips. IC20,13, 19(nvram), 20 and 14. I also swapped out the MPU IC1.
In the back of my head I keep thinking that in need to check the 7408 AND chip.

Well, looking for a short cut ain't gonna cut it. I pulled all socketed chips and the 7408 and socketed that one also. Going to double-check the blanking and the chrystal. The only other chip that I can think of that could keep the mpu from booting would be C11 74LS10. That chip is common with everything on the board if I remember right.

See what happens....

Is it common that when something gives on the driver board that the mpu goes also?