Redmi note8 startup screen does not light up for repair

Redmi note8 startup screen does not light up for repair

Type of failure: Redmi Note8
Malfunction: The machine is water damage, but it is turned on without display or backlight.

Redmi note8 startup screen does not light up for repair figure 1.

Fault analysis:VCC corrode should be checked first for the display lamp control fault caused by water damage.
Maintenance process: firstly, observe that the light control part of the main board is covered with sealant, and there is no trace of water damage.

Redmi note8 startup screen does not light up for repair figure 2.

Observation shows that BTB connector is also clean.

Redmi note8 startup screen does not light up for repair figure 3.

Redmi note8 startup screen does not light up for repair figure 4.

According to Boardview, the display ic is integrated in the charging ic.

Redmi note8 startup screen does not light up for repair figure 5.

Unpacking shielding cover found corrode above the chip.

Redmi note8 startup screen does not light up for repair figure 6.

auto power off,pin, and some corrode.

Redmi note8 startup screen does not light up for repair figure 7.

This is the step-up Inductor at the display input, so replace it directly.

Redmi note8 startup screen does not light up for repair figure 8.

Maintenance result: boot test, perfect repair.

Redmi note8 startup screen does not light up for repair figure 9.