Have an escape from the lost world mpu that I am trying to fix. I had no led flashes at all, replaced 6803 and both pia chips. Now the led flashes erratically. Sometimes it will flash a few and get stuck other times it flashes more than 9 times. Seems like it is boot looping. Tried replacing 6116 with nvram but flashing became quicker and more erratic so I put original back. All test points have correct voltages. Test points on power board all good. All power board fuses good. Nothing from displays. Gi lights and some flashers come on with power. Sound board boots and plays sound with test switch... help!

I was thinking to try replacing u2 u3 game roms next...