K52JR-X4 - Screen Static.. Even after 5 RMAs replacing the LCD, LCD Cable and Motherboard.

Hey. So I'm currently the owner of what I would call a demontop that refuses to be repaired and is determined to haunt me. Basically, on all colors just slightly brighter than black, there's some visible static. Despite my efforts to send it in for repairs to ASUS and a local repair shop, no one can seem to figure it out. At this point, while armed with an instruction manual, I'm willing to open up the laptop and experiment.
I'm hoping that someone out there has seen this before or might actually have a pretty good idea of what could be causing it.

Here's a list of parts in order of replacement:
-Display
-LCD cable
-Top cover
-Motherboard

This doesn't occur under load and is constant and consistent the SECOND you turn on the laptop. So it's noticeable at the post screen, too.

I'm pretty determined to figure this out. So... to help diagnose this from across the internets, I made some GIFs that show what the snow/distortion looks like. Here they are:

This first one is what you see on dark-grey.


And the second shows what it looks like with an image that has some dark-greys in it.


I posted about this before and got some pretty good insights, but now that ASUS has replaced the motherboard, I'm absolutely baffled. And hooking up an external monitor shows no static, so the videocard seems like it's holding up pretty well. So I'm double baffled.

 

I think either the LCD, LCD cable, or the motherboard is still malfunctioning, although I have to admit this is the first time I've ever seen something like this.

 

Yeah, it's pretty weird. Since an external monitor doesn't show any static, then I'm thinking it isn't the motherboard. Is there any truth to that idea?

 

Well the connector for the LCD cable could still be messed up. But since they changed it for you, and those connectors are not known to fail easily, there is a good chance your problem is either the LCD cable or LCD itself.