Screan with I/O konectrd turns off. And Fan runs very loud.

Hi people. I buy a Watter damaged Macbook Air Early 2014, model 1466 with 1.4 i5 processor.

Soo I open it, and clean all ocidation on power supply Board. I/O board. And try to turn on. Then my mac turn on for 20 secondy and screan light turn of, and the picture in the background ist just blinking.

So i try lots of thong, and when i Disconect a Flex cable wich goues from I/O board, to a mainboard (i think it is for speaker and some more control) the macbook runs "normal" screan light is on, picture of screan is good, but Fan still runn too high, Ithink maximum, and pc work soo slow. Battery is charging, and it runs on battery, but with same simptoms. So i need a opinion what could be a problem. I/O charging board, or a Flex cable? I dont have to buy it here to check, i must to buy it from ebay. :( Thank you! :)

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