ok,theres lm339 IC's on the opto board and on the CPU board.these IC's do go bad not all of them but some of them.If none of the optos are working it would mostly likely be a connection problem on the CPU or the opto board.power off the game and reseat the ribbon connector on the CPU(do this slowly so you dont miss a row of pins or bend them).Then on the opto board underneath the playfield reseat the connectors on the opto board.Try this and report back,patience is key trust me we all had issues when we got into this hobby and it can be frustrating but very rewarding when you get it fixed.we are here to help ok,give it a shot and post back..

ok,theres an small LED on the opto board is it flashing or staying lit solid?

ok that means the opto board is working properly,the problem would be on the CPU board.one of the LM339 IC's or U20 on CPU.is U20 IC socketed on your board?

Thank you i appreciate it buddy..

He's have problems with only the optos and it's leading to the lm339 on cpu,opto board is good

you might want to fix your games first before you dive into this one