Repair of Huawei Mate Xs 5G folding screen mobile phone when it is not turned on

After replanting the CPU, the machine was turned on, and the fault remained, so the upper cover was replaced. The covers of Kirin 970, 980 and 990 are universal, and Huawei Mate XS has only one configuration, 8G+512, so find an 8G cover of Kirin 980 to install. The boot is normal and the fault is repaired.

Machine model: Huawei Mate Xs 5G mobile phone

Fault phenomenon: the phone is not turned on and the screen is not displayed.

Maintenance process:

After receiving a Huawei Mate Xs 5G mobile phone, press the power button. The current is normal power-on current, but the screen does not display. When the current reaches about 1A, the power-on sound will be heard. When the normal machine rings the power-on sound, Huawei LOGO will come out.

And this boot sound is abnormal, it gets stuck when it rings, and the phone restarts when it is powered off, and so on. Restart as soon as the boot sound rings, and there is no response on the screen. Plug in the charger to charge, the current will stop for a few seconds after it reaches 2A, and then it will fall back to zero, and then it will reach 2A again, and so on.

Huawei Mate Xs is equipped with Kirin 990 processor, and Kirin’s CPU restart is basically a common problem, which is generally caused by CPU virtual welding or damage to the upper cover. Considering that the mobile phone does not display at the same time, replant the CPU first.