Aliexpress Famicom motherboard video issues

[nullray]

I have a non functioning original Famicom that has severe water damage. Browsing Aliexpress I saw there is a seller offering aftermarket motherboards. You just supply the CPU/PPU and some ports.

I decided to try it on a lark. The build quality is not at all bad, and the system sort of works. The problem I have is with the video.

It shipped with a PAL crystal that I swapped out for an NTSC compatible crystal(the original one from the Famicom). When I have the console connected to a CRT the picture mostly rolls OR is really shaky/jittery. Aside from that the console does appear to function. You can play games and controls all seem to be fine.

I attempted to trace out the video pathway and it _looks_ like it is following the composite schematic as found in the NESdev wiki.

I have a couple imgur galleries here:

Board shots
Video pathway

I was curious if anyone here has any experience with these boards. I was also wondering if anyone would know why the picture is so wonky.

Thanks in advance for any help/info!