Huawei Mate 40 Pro can't start machine maintenance after heavy fall

Huawei Mate 40 Pro can’t start machine maintenance after heavy fall

Disassemble the motherboard, open the shielding cover, and find that several inductors have fallen off, and several inductors on the edge of the power chip have fallen off by virtual welding. Considering that the CPU is prone to virtual soldering after the mobile phone falls heavily. So take off the CPU, the current on the single board is normal, and put the CPU back.

Machine model: Huawei Mate 40 Pro

Fault phenomenon: The customer described that the mobile phone could not be turned on after heavy fall, hoping to save a large number of photos and materials inside.

Maintenance process:

After getting the mobile phone, I found that Huawei Mate 40 Pro fell badly, and the screen and shell glass cracked into cobwebs.

Huawei Mate 40 Pro can’t start the machine after heavy fall. Figure 1

Huawei Mate 40 Pro can’t start the machine after heavy fall. Figure 2

Plug in the data cable and press the power button, and the phone doesn’t respond and can’t turn on the machine, which means there should be something wrong with the motherboard. I hope it’s not that the middle layer of the motherboard is broken. Disassemble the motherboard, open the shielding cover, and find that several inductors have fallen off, and several inductors on the edge of the power chip have fallen off by virtual welding.

Huawei Mate 40 Pro can’t start the machine after heavy fall. Figure 3

Huawei Mate 40 Pro can’t start the machine after heavy fall. Figure 4

Find a small inductance to make up the inductance at the falling position, and turn on the power to test, but the mobile phone still won’t turn on.

Huawei Mate 40 Pro can’t open the machine for maintenance after heavy fall Figure 5

Considering that the CPU is prone to virtual soldering after the mobile phone falls heavily. So take off the CPU, the current on the single board is normal, and put the CPU back.

Huawei Mate 40 Pro can’t start the machine after heavy fall. Figure 6

After installing the CPU, connect the power cord of the repair machine, and press the power button again, the current can jump normally. Install the motherboard into the mobile phone to start the test, and it can be turned on, but the screen leaks and some contents cannot be displayed normally. However, after the customer requests to repair it, it is enough to save the photos and materials in the mobile phone, so the maintenance is over here.