Unplug the antenna jack on the left and the flat cable in the middle

Carefully unsolder the four separate wires without damaging anything with your soldering iron. You may need an assistant to hold the speaker out of the way.

Prepare the new board by applying solder to the four square pads with the soldering iron (tinning the pads).

Gently lift the board out before installing the replacement board

Solder the four wires to the new board in the same positions. Make sure you match the colours of the wires shown by the arrows.

Plug in in the antenna and flat cable.

Screw the speaker back into place.