trying to troubleshoot not working displays on a newly aquired game. only player 2 shows a few digits but its gibberish. player 1 and 3 had shown some gibberish as well, but now they are completely dark.
my question is if anyone has some instruction as to how to diagonose if display issue is MPU or display board related.
i have a c-10877 display board. i have checked the 6118a and U9, U12-14 chips for shorts, as well as replaced U41,42, and U44 on MPU all to no avail. also r1,r4 on power supply.
thanks.