Use this guide to replace the back cover which houses the back panel buttons and LCD screen.
Remove the following eleven screws securing the covers to the ZS3
Eleven 3 mm Phillips screws
Use the flat end of a spudger to pry apart the back cover from the rest of the unit as shown.
Using your fingernail or a spudger, flip up the ZIF locking flap on the two LCD ribbon cable sockets that connect the back cover to the rest of the unit.
Remove the two LCD board ribbon cables out of their sockets.