Huawei glory 20i mobile phone screen display backlight does not light repair

Huawei glory 20i mobile phone screen display backlight does not light repair

It is found that the resistance value of LED3- to ground is abnormal. Remove the IC, test the two places with buzzer, and make sure the motherboard is disconnected. Fly the wire directly, install the IC, and the resistance is normal. Installation test, lighting is normal.

Model: Huawei Glory 20i

Malfunction: the backlight of the mobile phone screen is not lit.

Maintenance process:

A Huawei Glory 20i, the screen of the mobile phone is displayed, but the backlight is not lit.

Dismantle the machine, take out the motherboard, and check the resistance of the display base. It is found that the resistance of LED3- to the ground is abnormal.

Open Xinzhizhao, check the drawings and bitmap, and know that this LED3- leads to the D1 pin of the lighting boost IC.

Huawei 20i mobile phone screen display backlight does not light maintenance Figure 1

Huawei 20i mobile phone screen display backlight does not light maintenance Figure 2

Remove the IC, test the two places with buzzer, and make sure the motherboard is disconnected.

Huawei 20i mobile phone screen display backlight does not light maintenance Figure 3

Fly the wire directly, install the IC, and the resistance is normal.

Huawei 20i mobile phone screen display backlight does not light maintenance Figure 4

Huawei’s glory 20i mobile phone screen display backlight does not light maintenance Figure 5

Huawei 20i mobile phone screen display backlight does not light maintenance Figure 6

Installation test, lighting is normal.

Huawei 20i mobile phone screen display backlight does not light maintenance Figure 7