Studio 1555 screen/backlight won't turn on

I have a Dell Studio 1555 - recently I've had some issues with the plastic casing around the screen, and as a result, the screen hinge started slowly pulling away from the computer. After a few months of this, my computer started shutting down when the screen was below a certain angle, and most recently, the screen has stopped turning on completely.

I connected it to an external monitor, and the computer still works. I also shone a flashlight at the screen, and can see stuff being displayed, so I'm assuming it's the back light.

I took the laptop to a repair shop, who suggested that it's a problem with the LVDS cable/LCD Ribbon cable, with one connector being frayed (It's the grey cable in the back on this one: http://www.ebay.co.uk/itm/Dell-Studio-1555-15-6-WXGAHD-LCD-Ribbon-Cable-W439J-/390481502259?pt=UK_Computing_CablesConnectors_RL&hash=item5aea82e033[1] )

I just wanted to get a second opinion from you guys on whether this is most likely what the issue is, because I might just order the cable myself and get a friend to replace the cable. Thanks!