Before you remove completely the power supply, unscrew the T6 screws on each side of the socket.

You may now be able to remove the power supply with a spudger.

Do not pull the wires to remove the power supply. The connector is fragile.

The rating of the power supply is 3.4V at 1.75A, which is identical to the 2nd Gen Apple TV's 5.95 watts.