Huawei Mate 30mobile phoneFast power consumption fault repair

Huawei Mate 30mobile phoneFast power consumption fault repair

Huawei Mate 30, the fault is that the standby power consumption of the mobile phone is extremely fast. Basically, it will be dead after a full discharge for one night. It is the same with replacing the battery after delivery. There is no way but to send it to us to see if it is caused by the motherboard problem. Then let’s see how our repairman handles it!

[Machine model] Huawei Mate 30

[Fault phenomenon] Fast power consumption

[Maintenance process] I received a Huawei Mate 30 from the customer. According to the customer’s description, the standby power consumption of the mobile phone is extremely fast. Basically, it will be dead after a full discharge for one night. It is the same for sending it to the after-sales battery. There is no way but to send it to us to see if it is caused by the motherboard problem.

After getting the mobile phone, the master first tests all the functions, because it can be turned on, so we can see if there is leakage caused by chip damage. If the chip leaks electricity, the corresponding function will also have abnormal problems.

Huawei Mate 30 consumes fast power Figure 1

After testing the functions, it was found that all the functions were normal, but it was true that the power consumption was fast. After testing for a few minutes, the master lost 20% of the power, so there were only other ways. Turn on the flight mode, and then put the mobile phone aside for testing, and the power consumption was still fast. The flight mode was started to eliminate the leakage of the RF part, and it seems that it is not the RF problem.

In this case, we have to take apart the machine and test it. Connect the single motherboard to a regulated power supply, and find that the standby current is normal, and the trigger jump is normal. After the trigger is completely turned on, the standby current after the boot is set at about 200ma, and the normal standby current will not remain so high all the time. The current of 200ma can already be reflected by thermal imaging, and thermal imaging can be directly performed.

Huawei Mate 30 consumes fast power Figure 2

Huawei Mate 30 consumes fast power Figure 3

Sure enough, it was found that there was an obvious redness in the shielding cover. When the shielding cover was removed, it was found that the signal part of a WiFi power amplifier chip was hot, according toblueprintfindschematic diagramAfter the chip was removed, the standby was normal. Because there was no chip replacement, we directly shorted the 1.5.6 pin according to the schematic diagram, and then installed it for testing. After turning on WiFi, it was found that the 5G part was normal, and then the mobile phone was installed and put aside for testing. It was measured that it only consumed about 5% of electricity for standby for one night, and the problem was perfectly fixed.

Huawei Mate 30 consumes fast power Figure 4

[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.