Well, I detached the video and touch/camera cables from the existing FHD screen and connected the ones from the QHD panel (I just left the back cover off the laptop and let the new panel dangle off... I wasn't sure if the panel is supposed to be grounded through the hinge, so I connected a clip lead just in case) -- booted the system but got no video, either in BIOS or booted. Worth noting are: Finally, I don't know the history of my "new" QHD panel--even tho it looks factory-fresh, it's Dell sticker actually says "Refurbished" and there's a bump blemish opposite the camera (maybe the whole unit is fried), so I won't conclude that it will not work, just that this panel didn't work for me. If the panel had worked, then I would have transplanted the old back edge with the LEDs (and/or clamshell, since it's in new condition, sans the bump, vs mine) and antennas.
E7440 FHD/1920 touch upgrade to QHD2560x1440 touch? I happen to have a spare 8780G QHD display sitting around. It's identical in appearance to the current FHD display on my E7440 -- full gorilla glass touch panel, with carbon-fiber outer clamshell. I'd like to swap out the 1920x1080 for the 2560x1440 panel. I'm under the impression that the cabling is the same/compatible. Am i wrong?, and is there anything else I would need to do prior to the transplant to insure success? I've read that the PC needs to be able to identify the display, so ... upgrade BIOS?... Will this display simply not work due to non-support in the motherboard bios or firmware? Thanks  
E7440 FHD touch upgrade to QHD touch?