Moto G30 screen replacement

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Introduction

Guide to replace a broken screen on Moto G30 phones. On this model, the label on the back says "Type: MC391".

Unclip the plastic back cover using any tool you like (mediators, sprudgers, Jimmy...)
Be careful not to lift the cover too far from the phone, it has to be lifted cautiously because a cable is attached to it

Slighly move the back cover in order to unscrew the plastic piece behind it
You will find 9 small Philips-head screws
You will also have to remove small black adhesive pieces to be able to remove the part completely

Once the black plastic cover piece is removed, it is possible to unplug the cable holding the back panel
Once this flex cable unplugged, lift the back panel completely

Unplug both battery and display connectors (battery on the right and display in the middle). You can use the opening tool as lever.

Very carefully unglue the battery
Adhesive is quite strong here, and the battery is not very rigid, so this is a complicated operation. It would be dangerous to head the battery cell, be patient and careful.

Once the battery is gone, it is possible to add some heat to help detach the screen
I could not properly unglue with a cutter blade on the side. My technique is simpler and more brutal: I pushed the display away from the connector hole, with a rigid tool.

Replug the battery pack
Test battery voltage on the testpoint at the left of the connector (you will find ground anywhere on the metal chassis). Voltage must be between 3.6 and 4.2 V.
You can also test the motherboard with a Linux-based computer
Unglue the screen-USB-motherboard flex cable from your broken screen, and replug the bottom USB board with the top motherboard
Turn on phone with Power On + Up buttons
Plug it to the computer with an USB-C cable
Type "lsusb" in a shell
If you can read something like "22b8:XXXX Motorola PCS moto g(30)", congratulations: your motherboard still lives

Once your phone has been successfully torn down and tested, it is time to order the replacement screen
The part will cost you around 15-20€. You can find it here for instance
While waiting for your order, don’t forget to store your parts and small screw properly