L655D-S5055 LCD horizontal line issue - possible motherboard or GPU failing??

Hello,
A few weeks ago a horizontal line running from the left edge to the right edge of the LCD about 2 1/4"
from the bottom of the LCD started to occur. The line shows up from the time the screen turns on
and remains in CMOS or the Win 7 desktop. I have replaced the LCD panel with a new OEM LCD
panel, this did not resolve the issue. I replaced the internal video cable, this did not resolve the issue.
Since the line occurs in the CMOS screen (DOS prompt screen) or in Win7, there is not video driver
issue I believe. I also updated the L655D BIOS to the latest v2.10 Nothing has resolved the issue.
Is this possibly a sign of a GPU issue at the motherboard level? I have noted that the space below the line does "flicker" or distort the image, but only below the line. The rest of the image on the screen stays without any problem. I have also attached the laptop to an external monitor which has no line like this or any issues with the display at all. Thus the reason I had originally concluded the LCD panel and internal
video cable.
Does anyone know if this is a known problem with specific motherboards with this model laptop, or GPUs?
Is there a replacement motherboard program for this laptop as this is certainly a quality issue that should
not be left for the enduser to replace the motherboard and be charged a high cost repair such as this!
I appreciate any guidance or advice on this issue. I have attached two pictures for reference of this problem.
One shows the line in a Command prompt screen, the other while in Win 7.
[Updated: 2-Apr-2013] based on further research and experience with other similar issues, I am beginning to think this is related to heat and the GPU impacted by poor quality soldering or some other issue of that nature. I have performed "reballing" with other products, but am not sure about whether this issue can be resolved or how to go about an effective "reball" for this product motherboard. A replacement, used motherboard is hard to find and if found are over $150USD. Again, it seems unfair to the consumer to have a laptop like this for 4 years and need to replace the motherboard or live with this issue until the unit fails completely.
Thank you in advance.
MP
Attachments:
L655D_LCD2.jpg ‏9 KB
L655D_LCD1.jpg ‏8 KB

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