I need your help here.
Firstly the game runs every time when I tutn it on.But before 1 day,it begins to show U41 PIA error when try to boot.OK.A wait abou 10-15min and turn it on.Game boot and everithing is working perfectly.But after 2-3 turn on and turn of(repair some drop targets,targets and lapms),the error message again start.I change the PIA but with no effect.After changing it ,it start from the first time I play for a while.Turn of the game.After power on,error again.And now even 2-3 h of no power on,the game won't boot and the message is shownig evey time.I think is some other chip bad or element.Can you tell me what I maust to look/measure

Thanks

I know it's too late for this post but can be in help
Problem was solved
One of the game rom was not placed good in it's socket