Bad GPU or LCD?

[MCMXCVII]

First off,
I'm computer literate so no layman's terms are required for this answer.

Second:
The laptop is a HP Envy M6-1148ca. The laptop (see pics) has a problem with the LCD where it shows nothing but vertical lines all over the screen!

The laptop works fine on an external monitor (Connected via VGA) (no artifacts, lines etc..) which leads me to thinking it's the LCD screen and not the GPU as it wouldn't output PERIOD if it was the GPU itself (right?)

This laptop model has Crossfire as it has 2 GPUs (Integrated and Dedicated)

So my main question is;
Bad LCD or GPU?

Specs:
A8-4500M Quad-Core 2.0GHz Processor
8GB DDR3 Ram
AMD Radeon HD 7640G Discrete-Class graphics

Picture:
http/i43.tinypic.com/op5ru0.jpg

 

[ronintexas]

I would bet on the LCD panel OR the connections from the panel to the mobo.

 

[MCMXCVII]

I would bet on the LCD panel OR the connections from the panel to the mobo.

So it possibly could be a loose connector or just bad LCD itself correct?
HP was charging close to 260 dollars to get it replaced (with a 90 day warranty) which is really a rip off considering that I can get the panel myself for 60 dollars and pay an additional 40-50 to get it installed and it will STILL be a fraction of the cost with a 1 year warranty on the panel.

Suggestions?

 

[MCMXCVII]

I could replace it myself but fat hands and small parts don't mix well...
Been there & done that. lmfao

 

[MCMXCVII]

I would bet on the LCD panel OR the connections from the panel to the mobo.

I took the laptop apart yesterday.
It's the LCD panel, I tried playing with the connector to no avail.
At least I found out why my mouse pad stopped working (it was disconnected).
Thanks!