Does the screen randomly go to a lit up black screen? There is a common CPU issue on these where it will usually do that and restart, sometimes showing some pixel width slightly diagonal lines going down the screen.
To replace the LCD cable (not guaranteed to fix your issue), follow the below guide. Step 28 shows the LCD cable (unscrew the PCB and it unplugs from the other side), you can ignore a lot of the steps before this (removing the audio board, etc) since you don't have to remove the whole assembly.
[guide|44274]