Huge issue of modern flex cables going to LCD panels is their shitty design and also idea to have 16-20v main voltage (going to backlight controller) with all other low voltage signal lines around. MacBook are known to have 19v right near signal lines even on connectors.
On cheaper or wrongly made notes any short between signal line and 19v can fry all main chips on motherboard, on better ones you will require expensive MB repair, as it'll only some passive elements and fuses that will be gone.
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