I would probably say the same thing; those LCD cables seem to want to fall off to no end. Not sure if you've ruled this out already, but it's good to cover all bases: It might be the auto-lock feature. If you can consistently replicate the problem though, with auto-lock off, I'd just remove the digitizer and reconnect the LCD cables.
Have you ever taken your iPad apart? If so, it may be a backlight issue with the LCD, in which case you need a new one. It also might be a setting, on Apple devices you can make the iPad set the brightness automatically- make sure that's turned off.
There are three main things that could have happened here: -Faulty Digitizer Sometimes a digitizer is just defective. -Incorrectly Folded Cable The cable connecting your digitizer to your logic board could be pinched. -Digitizer Connection Make sure the port where the digitizer connects to the logic board is secure, and that you've pushed down the tiny locking levers.