Quoted from Jagdad:

Hey Earthshakers
New guy on the page with a reasonably good Earthshaker in the basement and no experience, at all in Pinball. My game quit about a month ago and I finally decided to take a shot at repair. Found the manual and got up to speed. Found two problems. Lamp coil circuit of the transformer was dead! Easy fix, new trans.
Second problem was the game lost it's programming everytime I turned it off. More research showed the game had batteries that I didn't even realize. Changed the batteries but realized the battery holder was toast. Not too bad, got a battery replacement mod from Todd at TNT Amusements for the coin battery modification board. Pretty simple install, fit like it was supposed to and I reinstalled the board. Powered up the game, changed one item in programming to free play, closed the program and the display went to every segment lit up. Game now locks up with full segment display at the end of programming. Before I changed to the coin battery, I could still play the game. Now it won't play at all.
The display flickers slowly once it displays all segments but never allows play.
Tried everything I could think of all to no avail.
I sure would like to hear if anyone else has run into this problem. I don't know where to go from here
Any help would be greatly appreciated