Help.
I have a Last Action Hero that I got a few months ago and just now started to try to figure out the issues. First off when I got it, it had acid damage on MPU and coil was burnt on playfield. Took coil off and replaced the MPU with a rottendog mpu. Also replaced the transistor that ran to the coil that was burnt. The issue is that I turn on and just get the playfield lights.(Two right red lights stay on the mpu) Replaced the Power board and now I get the lights on and sound says I'll be back and then clicks on power board and playfield lights go out and gets a hummm. (far right red light goes out and far left light comes on the mpu). I am testing the power at tips and really not getting a reading. Don't know what to check now.
Any help would be appreciated.
Thanks,
Tom

Just tested the tips on power supply and MPU.
12v on power supply is measuring 12.7, all 5 v on MPU and Power supply measure around 4.9-5.1. 18v on MPU is around 18.9 - 19.2.
I get nothing on my display. disconnected that and not difference. Thinking if the eprom is bad and causing this. I took it off the old board. Did not look like any damage to it. First stage after turning on works like the GI lights come on then the sound says I'll be back and click at the power supply and waiting for coils to fire and nothing except lights go out LED light changes on MPU (stays lit) and just humming noise from speakers. Don't know what else to check.