Huawei Nova 4e enters Recovery mode for repair

Malfunction model: Huawei Nova4e
Fault phenomenon: customer descriptionmobileNormal use often restarts, enters Recovery mode, and sometimes enters the system.

Huawei Nova 4e enters Recovery mode repair figure 1.

Fault analysis: Huawei’s mobile phone automatically enters Recovery mode for various reasons, such as volume flat cable and its Related circuit, Inductor Inveracious Soldering, kit Inveracious Soldering, auto restart, etc., which are troublesome.
Maintenance process: First, test the normal WiFi function in Recovery mode, so first brush a machine with 1.0 mode.

Huawei Nova 4e enters Recovery mode repair figure 2.

After activating the mobile phone, it worked normally, but the customer said the next day that it was restarted from time to time. It took half an hour to get the Recovery mode, and it really restarted. This time, it directly indicated that the system was damaged. Later, it was thought that battery aging would also lead to it. The customer said that it had been used for many years, but it had never been repaired. After unpacking and observing, it did not move, so it changed the battery first.

Huawei Nova 4e enters Recovery mode repair figure 3.

As a result, the Stop at LOGO doesn’t move when the new battery is turned on. This time, it’s troublesome, but the battery is basically eliminated, and it can enter the system again after being turned off and turned on repeatedly.

Huawei Nova 4e enters Recovery mode for repair Figure 4.

Download an Ann Bunny and click to view the details.

Huawei Nova 4e enters Recovery mode repair figure 5.

It is found that there are all core working frequencies, which means that without Inveracious Soldering, the direction is obvious. The motherboard is very beautiful, and after so long use, the fault is locked in the power supply Inveracious Soldering.

Huawei Nova 4e enters Recovery mode for repair Figure 6.

Repeat welding power supply.
Repair result: The novel test was played for one hour with a book listening software when it was turned on, but it was not restarted, then the playback was suspended. The screen was locked for one hour, and the illuminated screen was still in the novel playback interface, indicating that it was not restarted, and it was perfectly repaired.