Huawei enjoys 20SE maintenance without turning on the water.

By looking at the bitmap of Huawei Enjoy 20 SE motherboard in Xinzhizhuang software, it is found that there are many components and chips connected to the main power supply. The phenomenon of automatic current jump is solved by directly removing the small power supply and then connecting the motherboard.

Machine model: Huawei enjoys 20 SE.

Fault phenomenon: the mobile phone does not turn on when it is flooded.

Fault analysis:

When the mobile phone is not turned on when it is flooded, the common fault point is caused by corrosion of motherboard components and chips. When maintaining, first check the water inlet position of the motherboard under a microscope. If components are corroded or burned out, replace the corroded or burned-out components before further maintenance.

Maintenance process:

After getting the mobile phone, start the test first, and there is no response when pressing the power button, and there is no response when plugging in the charging cable.

Huawei enjoys 20SE maintenance without turning on the water Figure 1

Take the mobile phone apart and take out the motherboard for observation, and no obvious corrosion components are found. Connect the mainboard with the repair machine power cord, and find that the current of the adjustable power supply automatically jumps. This happens to the motherboard of Android mobile phone, which is generally caused by a short circuit in the secondary main power supply of the motherboard.

Huawei enjoys 20SE maintenance without turning on the water Figure 2

Huawei enjoys 20SE water intake and maintenance without starting. Figure 3

By looking at the bitmap of Huawei Enjoy 20 SE motherboard in Xinzhizhuang software, it is found that there are many components and chips connected to the main power supply, both on the front and back of the motherboard, and they are all under the shielding cover. Any problem with any component will lead to abnormal main power supply.

Huawei enjoys 20SE water intake and maintenance without starting. Figure 4

Remove the shielding cover on the front of the motherboard, and put the motherboard under a microscope for observation. It is found that there is corrosion under the small power supply Hi6421. So the small power supply is directly removed, and then the motherboard is connected with electricity, and the phenomenon of automatic current jump is solved.

Huawei enjoys 20SE water intake and maintenance without starting. Figure 5

Replace a new Hi6421 small power supply, and the startup current of the repair machine line jumps normally. Install the motherboard into the mobile phone and then start the test. The display screen of the mobile phone can be displayed normally, and load the system into the screen lock password interface, where Huawei can enjoy the 20SE mobile phone repair.