sync issue

I have recently purchased a supergun and a HDMI converter PCB from aliexpress and I was having this problem where the top and bottom lines would be shaking.

hello, I'm repairing this bootleg wonder boy 3 which has a sync issue (image is slowly rolling vertically and also slightly shifted to the right with a portion that returns to the left) and missing audio. For those who are going to suggest to trim the monitor I already did and that's the best...