Pixelated video on Lightbridge 1. The pixilation has gradually worsened over time. I have tried replacing the HDMI cable with no luck,  could it be a bad PCBA board on the gimbal?
Setup. S900, Lightbridge 1, Zenmuse Z15-GH4.

That could be an issue. Just to clarify, though, how long have you had this set up? Was this set up working before or is this happening right out of the box? Are you able to connect to the camera to LB1 directly via HDMI to see if the pixelation persists? The latter will verify whether or not it's an issue with the gimbal itself.

Was working out of box. I've had this setup about 3 years. About the last 18 months the video has been like this. The video is ok if connected directly to the LB1 so it must be a problem with the Zenmuse Z15 ?