Guide with all the necessary steps for you to change the Sony Xperia Z5 Compact motherboard (E5823) yourself.
We will start by removing the back cover. This is stuck to the frame, so we will heat it to soften the adhesive. We will put it on the thermal pad for about 40 seconds at 50-60ºC.
When it is hot we will introduce a pick or other opening tool between the lid and the frame, and sliding it around the contour, we will take it off.
We will also remove the label from the phone so that it does not disturb.
To remove the intermediate housing with antenna, we will have to remove the ten Phillips screws (PH # 000) that attach it to the chassis and then we will disengage it. We must not forget to disconnect the NFC antenna and detach the flash from the rear camera before removing it.
Before removing the motherboard, we will have to remove the SD and SIM cards, to prevent them from snagging when removed.
To remove the SD card, we will press it lightly and it will be ejected automatically. To remove the SIM card we will have to pull the tray with tweezers.
Now we can undo the plate of the chassis but we still can not remove it. We will lift it by the connector side of the NFC antenna so as not to damage the flex.
We will take advantage to remove the adhesive that covers the connectors of the flex screen and the flex of push buttons, vibrator, etc.