How To - Let's fix a Weird Data East Board Problem! Part 1

Let's look at a weird Data East MPU problem. It started out with what I thought was a blanking issue, but now has turned to be much more involved.
Music: www.bensound.com

[@GlennHamblin]

Bad solder joint on one of the ICs you're looking at?

[@mikethompson7436]

My hook drain save coil is locking on I replaced Q4 and installed a new coil which immediately licks on I did manage to power off b4 blowing q4 again any ideas where to look

[@Milli_vanilli89]

My autoplunger is doing the same thing any ideas where to look

[@QuinleysCorner]

will you work on a 1990 delta east the simpsons sound board?

[@chriscouch2882]

What happened to yours? Mine just started acting up.