Based on your description I am almost 99.9% sure that a component on the logic board has burnt out. This kind of repair should be done by a professional service center, it is not something that can repaired by getting responses in the forum. A hardware repair like this will need specialist equipment and a decade of experience to perform a long lasting repair.
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Best I can do is allocate one of our techs at https://pchospital-uk.com to execute a no quibble hardware repair.
Hope this helps , you have an expensive sought after Macbook Air and it will require delicate attention to put right.
Based on your description I am almost 99.9% sure that a component on the logic board has burnt out. This kind of repair should be done by a professional service center, it is not something that can repaired by getting responses in the forum. A hardware repair like this will need specialist equipment and a decade of experience to perform a long lasting repair.
Best I can do is allocate one of our techs at https://pchospital-uk.com to execute a no quibble hardware repair.
Hope this helps , you have an expensive sought after Macbook Air and it will require delicate attention to put right.