Operation Wolf missing green signal

salmart

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Does any one here knows what is a PCO40DA or where is it located at? There was a metal pin on the board and somehow it must have shorted something since now I'm not getting a green signal coming from the board. One the schematics I see three IC's: 79, 80 and 81 mark PCO40DA but I can't find it on the board itself. Thanks for any leads.
 
Missing green signal problem fixed. The PC040DA turn out to be TC0070RGB (custom chip). I was able to scavenge this chip from a non-working Thunderbolt PCB. Now I have a nice picture but I need to recalibrate the gun. Anyone knows how to calibrate the gun? If I recall, there is a procedure on how to do this but I don't remember the steps, something like turning the game off and then back on and pressing something at the same time.
 
I have the same problem

I have an Op Thunderbolt that is missing red. How did you find that error, and where was that chip located??????
 
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