Guide with all the necessary steps for you to change the components of the Google Pixel 3a (G020F) yourself.
To start we must apply heat to the screen to soften the adhesive that holds it. Once the heat has been applied, we can introduce a sufficiently thin tool that allows us to introduce one or a few plastic spikes, with which we are less likely to damage the screen by taking off all the edges.
Remove the fourteen Torx screws (T4) that hold the intermediate housing, take off the proximity sensor from the top of the housing, and as we unhook the housing we must introduce the flex with the sensor through the hole.
The two Torx screws that are more or less in the middle of both sides may be easier to remove with a T3 screwdriver.