The panel itself is probably still virtuous and whether the cables are good and sitting all right, there is a circut board on both computers near the panel (by hinges or behing panel) that controls signals to the panel, this could metal bad. Since this computer I believe uses UMA arcitecture and the processor whether uses the main CPU or has seperate is on the northwest bridge, this north bridge should be OK as associate external display works. Or a bad alloy joint on the video card/ processing bridge could glucinium casuing it as obviously the monitors use totally different ports and routing.
Edit: Usually if the panel is bad the full entry wont feathery up it seems more like a signal problem but stranger things have happened.
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