I bought a few universal chassis from Aliexpress for myself and a couple friends to try out. I have a Mortal Kombat with a 25K7000 that has issues with the chassis so I figured I would try one out. I realize the Chinese universal chassis are not the same quality as an original but I wanted to give one a go anyway.
I hooked everything up. I of course double checked the yoke readings on my tube first and everything checked out good, but I unfortunately get no image at all, no neck glow, etc. I have tested two of these so far and I have the same issue. Is there anything I could be missing? I have the power, neckboard ground, yoke connections and video input all connected.
Here is a pic of the chassis I have:


Has anyone had any luck with this exact chassis? I have also tried it with a different tube and iso.