Dedicated Lock n' Chase screen jitter.

super56k

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For a while now, my dedictaed Lock n' Chase (ROM version NOT tape version), has had vertical jitter come and go as if the v-sync was not perfectly adjusted. I've done a cap kit on the monitor chassis and have cleaned and adjusted the v pots on the chassis multiple times and each time I think it's perfect, the screen will shake every once in a while after the game is on for a few mins.

Tonight, I hooked the TPG up to the monitor and it does not seem to shake with it driving the signal. So my game PCB is causing the issue? Any ideas?
 
I think this hardware is simmilar to BurgerTime if that helps.
 
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