The flat cable simply trasfers visual data to the screen to be displayed. The power for the backlight comes through the inverter which takes the low voltage DC power and converts it to high voltage AC power for the backlight. I am not sure what the usual thermal range is for that cable. Just make sure that all connections are tight. Loose connections can cause thermal conditions and shorten the life of all the components. If that flat cable was bad in any way, it most likely would not even carry a signal.
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