Maybe grounding issue? Scratching my head.
Beyond this current issue, I have no issues with grounding or power.
My setup has always had a power run with 4g to a distribution block feeding a bunch of audio stuff and dcdc to the computer. Then ground back to distribution block with 4g to chassis.
I have never noticed any issue with my lilliput in my setup. However, recently I tied my navigation screen into the setup for a dual screen setup and I notice some wavy lines almost as if the refresh rate is wrong. It gets worse when I turn up the bass. I only notice this issue with the nav screen when it's receiving the feed from the computer, everything is fine when the nav screen is in its standard mode. And I never notice any issues from the lilliput screen at all. So what could be the issue?
I would say its the cars grounding to the chassis, but no problem with the screen in regular mode.
Then I would say its the grounding of the computer, but no problems on the lilliput.
The way the computer is specifically grounded is through the dcdc USB, from that with the wire it came with, soldered to a 6g, and that to the distribution block, then a 4g to the chassis.