Arcade CRT vertical scrolling


Timid Neo Newbie
Hi guys,

Been following the forum for some time now, so I thought it was time to make an account :)

I have a problem with an old arcade crt monitor which scrolls the screen vertically.

I've changed the caps, resoldered the connections and even changed the vertical transistor but nothing seems to help :(

At the end of the video you can see if I just put my thumb on the vertical adjusting knob it stops scrolling, but starts scrolling again when I remove my thumb.

Do any of you guys have any ideas or tips on how to fix this??

Thanks for reading :)
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Mickey's Coach
It might be worth trying to clean the pot with some contact cleaner. Also check for dry joints on the of the bottom of the vert-sync pot and re-flow them if necessary.


Timid Neo Newbie
Thank you for your post pulstar :)
I went and bought a brand new pot, unfortunately it didn't change much :(

Any other ideas??