Use blunt nose tweezers to grip the backlight cable close to its head and pull it away from its ZIF connector slowly and steadily to separate the coating.

If the coating feels stubborn, reheat the connector and try again.

Keep pulling on the cable until it comes completely out of its socket.

During reassembly:

Inspect the head of the cable and the ZIF connector for any remaining coating that could prevent a good connection.

Peel off the coating—heating the cable and the ZIF connector when the coating becomes too brittle.

It doesn't have to look pretty! You just need to remove enough coating to have the cable sit properly in its connector.