One part of your Sony Xperia Z5 Compact get damaged and you want to repair it by yourself. If the hardware encounters problems, you must disassemble the phone to change it. Some spare parts as camera, earpiece, battery and LCD screen are easily damaged, finding step-by-step guides to replace them is useful. Here are some spare parts repair guides. https://www.ifixit.com/Device/Sony_Xperia_Z5C Chicking the link to learn how to disassemble and change them.