Huawei mobile phone motherboard is broken. Is it necessary to repair it?

Huawei Mate30 is a flagship mobile phone released by Huawei at the end of 19. It has been more than three years since it was released, and now a large number of them have entered the maintenance period. As a mobile phone maintenance practitioner, Bian Xiao recently received many customers who used Huawei Mate30 to report that his mate30 mobile phone suddenly could not be turned on. The performance failure is that the mobile phone has been stuck in Huawei's logo interface, and the mobile phone can't enter the system no matter how long it waits. Today we will tell you about Huawei.

The mobile phone was given by a fan friend in Kunming. The customer described that the mobile phone has been used for more than two years, and there are still some bumps in normal use. However, the phone was not seriously broken, and there has been no problem in normal use. However, just this morning, my mobile phone suddenly got stuck, and then I turned it off and restarted it myself. Unable to enter the system after restarting, as shown in the above figure.

The customer said that the mobile phone had been sent to our local Huawei authorized after-sales service center in Kunming for testing, saying that the mobile phone motherboard was broken. Because the warranty period of the mobile phone has expired, he has to pay for the replacement of the entire mobile phone motherboard. But the customer said that there is important information in the mobile phone, and he wants to repair the motherboard himself. Generally, he won't repair the motherboard after sale. If something goes wrong, he can only replace the whole motherboard for you, so the customer found us online, hoping that we could repair his mobile phone and keep the important information in it.

After receiving the mobile phone, directly disassemble and remove the motherboard, and start it with the DC power supply board. It is found that the startup current of the mobile phone motherboard jumps normally, but the mobile phone has been stuck in the startup interface. According to the previous maintenance experience of our maintenance master, this situation is generally a virtual welding of CPU on the motherboard.

Using multimeter to measure the resistance of power supply inductance around CPU to ground, it is found that the resistance of several lines to ground is too large, which is generally caused by virtual welding of CPU. Directly disassemble the CPU 390 degrees and reinstall it.

After the CPU is reinstalled, the mobile phone is turned on and enters the system immediately. After the installation test, all functions are normal. At this point, Mate30 has completed the maintenance of this boot screen.

This is Kunming 91 mobile phone repair center. We focus on Huawei's mobile phone maintenance and technology sharing. If you have the same question about Mate30, please feel free to comment on us.