Huawei P40 can't be turned on for repair after falling

Huawei P40 can’t be turned on for repair after falling

Huawei P40 mobile phone can’t be turned on when it is dropped. It is found that the CPU RAM has cracked due to dropping. Replace RAM and repair the fault.

Machine model: Huawei P40
Customer description: The mobile phone can’t be turned on when it is dropped.

Test results: mobile phone Won’t Turn On, power-on Low current Short circuit.
Fault analysis:Low current circuit is generally caused by the damage of some components of VCC with low power output.
First, observe whether the motherboard has obvious component damage, and move Inductor and Capacitor to see if Inveracious Soldering falls off.
openXinzhizao Soft software, find Boardview and schematic of Huawei P40, find LDO VCC output by power chip, and measure according to schematic combined with Boardview.

Huawei P40 can’t be turned on for repair after falling Figure 1.

Huawei P40 can’t be turned on for repair after falling Figure 2.

Measured VCC 1.8V Short circuit of CPU, checked the circuit again, found that RAM of CPU had cracked due to falling, replaced RAM, and repaired the fault.