Why is my camera screen white?

@nouraattia a white screen only means that your backlight turns on but you get know display. Start off by replacing the LCD. For that, use the service manual which has now been added to the Documents paragraph on this page Panasonic Lumix DMC-FX3

While you work on your camera, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!