Series S No Video

Hi, I bought a series S off FB Marketplace as broken. The HDMI was visibly broken. I replaced it with my hot air station and a new port. All the legs are solid when pressed with a pick, but still no video displayed. “No Signal” showing on my TV. I’ve tried booting into safe mode, different cables, and a different TV

I have gotten a few glimpses of scattered images once or twice in the several hours I’ve been trying to fix this. The HDMI port looks fine and the connections look solid. Wiggling the port or pushing down on the legs with a plastic sprudger doesn’t help.

Where else should I start looking?