Use this guide to replace the LCD screen which is housed in the camera's back cover.
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.
Take the back panel and use the flat end of the spudger to pry the LCD screen from the back cover.