Asteroids sk flickering

mike11

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I picked this game up and it was playing blind .... Found bad solder joints on the deflection board with the sk flickering .... Ref lower everything checked all the transistors fire it back up .... I have a pic but it flickers out as the sk is flickering ...... I'm pretty certain this isn't in the monitor ..... What should I suspect on the pcb ? Next thing I'm going to do is put the scope on the X Y outputs on the board and see if the signal is dropping out there ...... Somewhere in the past I ran across a guide to rebuild these monitors with current part nos for all the zeners I'd like to find that again if anyone knows the link please pass it on... I have everything here to do them just lost the locations

Any ideas on this issue id greatly appreciate
Thanks
 
found my X is flaky and dropping out.... anyone have a good drawing of the xy circuitry on this board ?
 
FIXED.... bad 74ls191 that was I believe at F10... games up and running fine now
 
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