Hi
My Fathom was working fine, now it act strange.
Mpu boot up with 1 flicker an 6 flash=normal.
All solderings seems fine and I have replaced sockets for u2 and u6. I have also test s1-s32 switches and the diodes close to it.

Game starts with spinner lit and 2x or 3x pf alternates by flippers and a lot of other weird things.

If I replace the board to an Altec mpu replacement board the game works perfect.

So, before I buy a new altec, I would hope to get this original fixed.

2 questions:
#1 any Idea what might be wrong with my board?
#2 I have new gameroms (u2 and u6) but they are of another chip (2732). That means I have to rejump the board. Should I cut off all the older ones including the ones that seems factorysoldered (eg e31-e32 e7-e8 ) as you hopefully can see at the picture, close to the dots.

Hope for answer
/Stefan

20200904_113931 (resized).jpg

The reason I replaced the sockets was due to the problem, so yes the problem was there before.

Thanks for the answers
I was on my way to rejump, but before I did, I lifted the original roms and sanded each legs very carefully.
Voila...it now works perfect.

Thanks for this excellent info, It might be of use later on
Take care and again...Thanks