Sega monaco gp vertical collapse

dyno

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My monaco gp has vertical collapse, it uses a 14" matsushita chassis. When I got the game the neckboard was cracked so I fixed that but still have vertical collapse, the previous owner said the game worked fine until it was moved and I assume thats when the neckboard was broken beacause the back door is missing. Thought it was the vertical output transistor but I changed that lastnight and still have vertical collapse, I can hear the game playing and the line is straight up and down the monitor. Where should I look next?
 
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