While lifting the top board, please pull the black tab on the connector part of the silver cable upwards and remove the connector.

If there is no black tab it is possible to remove the connector from the connector housing by using the spatger with the lever principle.Because this connector is long, please be sure to remove it straight up.

Even if you disconnected the cable attached to the top board when removing the top board, please be assured that iFixit sells the cables individually. There is an exchange guide, it can do easily.

How about trying as an opportunity to remove dust, hair, etc while removing the top board? The best is to use a can containing compressed air. If you do it with a solid brush made of building materials (using common animal hair), static electricity will be generated and you can destroy your computer.

In reassembling, please confirm that the four gray plastic clips are on the optical drive side of the keyboard. (Please refer to the second image.) Please firmly attach the clip so that the keyboard is securely fixed.

To ease the reassembly process, it is better to clip the clip part. Please note that doing with a strong force may cause damage.

(Translator's comment) Since it will not be fixed unless you attach it with a strong force when fixing the keyboard, the insertion opening of the optical drive may be distorted with a strong force.

There is no worry about being distorted if you put half of the disc such as a DVD and the credit card etc which you no longer need into the insertion opening in half.