Second repair glory x10 mobile phone does not display when turned on

Appearance inspection of motherboard, display ic and inductor have been replaced at home. Borrow a voltage of 1.8V directly according to the pin definition flying wire.

Fault model: Glory x10

Fault phenomenon: the phone does not display when it is turned on.

Maintenance process:

A glory X10, this machine is a second repair machine, the fault is that the mobile phone does not turn on and does not display. Appearance inspection of motherboard, display ic and inductor have been replaced at home.

The second repair glory x10 mobile phone does not display Figure 1 when it is turned on.

This model uses LM36274 display backlight two-in-one chip, and the basic chip of this model will not be damaged, mostly because the chip does not display without backlight due to insufficient working conditions.

With reference to Huawei nova2plus, the ic foot of the same paragraph is checked, and x10 shows two i2c of ic foot, and it is found that the boot is not 1.8V.

The second repair glory x10 mobile phone does not display Figure 2 when it is turned on.

The second repair glory x10 mobile phone does not display Figure 3 when turned on.

There is no voltage at both ends of the pull-up resistor on the measuring path, but the resistance at both ends is normal.

The pull-up of 1.8V comes from the power supply, and there is no voltage on the capacitor on the startup measurement path.

After redoing the power supply, the voltage returned to normal, but the boot failure remained. Display ic foot resistance and find D3 foot resistance OL.