Huawei enjoys 10plus without charging

Huawei enjoys 10plus without charging

After power failure, the resistance of L2501 is measured, and it is found that the front resistance is 380, but the back resistance is only 290. We can measure the front and back ends on C2502 and C2506. Does this seem to be inductance damage? The specific maintenance process is as follows:

[Machine model] Huawei enjoys 10plus

[Fault phenomenon] No charging

[Maintenance process] I received a machine sent by my colleague for repair, and the fault phenomenon was that the charging could not be charged, and the colleague repaired the charging and did not repair it, so it was sent to our side for maintenance.

Huawei enjoys 10plus without charging Figure 1

Take out the motherboard directly after receiving the machine, and find that the shielding cover near the charging has been removed, and there are several crooked capacitors next to it. After measuring that these capacitors are not short-circuited, we will open them directly.blueprint, check the working conditions of charging IC.

Huawei enjoys 10plus without charging Figure 2

The measured tail plug 5v has been sent to the charging IC, and both REGN and PMID have been generated. Then we measured the voltage of L2501, and found that the voltage of VBAT_SYS is only 3.1v This main power supply voltage is lower than that of the battery, so it is definitely impossible to charge. After power failure, we measured the resistance of L2501, and found that the front-end resistance is 380, but the back-end resistance is only 290. We can measure the front and rear ends on C2502 and C2506.

Huawei enjoys 10plus without charging Figure 3

When the air gun blows this inductor with heat, it easily tilts the inductor down. Moreover, observing the bottom corner pad of the inductor, it is found that the pad is obviously black. This kind of charging inductor is basically universal. Find a Huawei material board, install the inductor of a charging line from it, and power it up again to test the charging. Obviously, it can be seen that the charging current is more than 1 year, and it will charge 20% after standing for a while. It seems that the charging has returned to normal.

Huawei enjoys 10plus without charging Figure 4

[Maintenance Result] Install the motherboard into the.mobile phoneIn the power-on test, the mobile phone is turned on into the system normally, and the functions of charging, WiFi, sound, compass, vibration, telephone and so on are normal. The maintenance is over here.

This case was originally provided by Xunwei members, and it is forbidden to reprint it without authorization!