I have a Data East -Last Action Hero pinball which i am trying to restore for a couple of years with no results.
The Covid Lockdown was the perfect time to get my soul into restoring it .
The initial problem was ... weird behavior with an Open the Door display.
After removing the battery with no sign of corrosion i installed an NVram.
With the board on my bench i stated only Pia and +5 Volts. Sometimes though the PIA was off and blanking on-Weird!!!
I recently got an ic programmer and burnt a 27512 test eprom. It worked great as supposed.
So, i figured that the CPU ROM was faulty-true after checking it on my programmer.
So i burnt a new CPU ROM V1.12 and installed.
When i fired the game , the display shows only 4 big vertical lines (with 1-2 disappearing after a short time -the left side ones ).
Is this a result of not upgrading the driver board (I haven't changed roms for Sound and display )?
I will really appreciate your suggestions as this project has taken lot of effort and time to be solved.
Someone will be my hero .
Thank you in advance ...from sunny Greece.