How to solve the problem that Huawei P40 Pro is not turned on? Come and have a look

How to solve the problem that Huawei P40 Pro is not turned on? Come and have a look ~

The second repair of Huawei P40 Pro did not start, and the peer described that the fault was still repaired repeatedly. After the repair by Xunwei maintenance master, it was found that the maintenance was not complicated, but a simple problem of tin connection. The specific maintenance process was as follows:

“Machine model” Huawei P40 Pro

[Fault phenomenon] No boot.

[Maintenance process] Received a Huawei P40Pro sent by a peer for repair.mobile phone When the mobile phone came, it had been dismantled and repaired, and my colleagues also bluntly said that they had done a lot of things, but in the end they didn’t fix it, so they sent it to our master for a look.

Huawei P40 Pro does not boot Figure 1

When I took out the motherboard, I found that the motherboard layer was divided, and many chips were removed. It was found that the main power supply was short. Let’s first look at the moved place on the motherboard, and carefully observe that there are a lot of solder balls and solder oil stuck in the cracks on the lower layer. Wash the solder oil first, and then pick out the solder balls. During the process, I found that a solder ball has been connected to the pad and grounded, which is also the capacitor of the main power supply.

Huawei P40 Pro does not boot Figure 2

After a little heating, the resistance of the main power supply is restored, and the result is only a simple problem of tin connection. It seems that the peers either have no microscope or are not careful, and such a simple problem has not been found. A bunch of chips have been dismantled by mistake, and these removed chips have been replanted with tin, and the current is normal again, and the installation test can be started, OK.

Huawei P40 Pro does not boot Figure 3

[Maintenance result] Install the motherboard into the mobile phone, and start the test. The mobile phone is normally booted into the system, and the functions such as charging, WiFi, voice, compass, vibration and telephone are normal. The maintenance is over here.

This case was originally provided by Xunwei Quick Repair Flagship Store, and it is forbidden to reprint without authorization!