Huawei P30 has no fast charge

Huawei P30 has no fast charge.

Excluding external factors, after receiving the machine, we directly disassembled it to test the motherboard. When checking the tail socket, we found one.diode; the one who lacks dialectical thinkingIt has disappeared, and after repeated measurement and comparison, it is determined that this line should be in a state of breaking, which is definitely abnormal.

[Machine model] Huawei P30

【 Fault phenomenon 】 No fast charging

[Maintenance process] We received a machine from a customer, the model of which is Huawei P30, and the customer told us.mobile phoneI repaired the charging before and changed the tail plug after the sale. After using it for a while, I found that there was no fast charging, and it was not good to change the tail plug battery after the sale. I told you that I needed to spend money to change the motherboard. The customer didn’t want to change the motherboard, so she sent the mobile phone to us.

Huawei P30 has no fast charge Figure 1

Since the external factors have been ruled out, after receiving the machine, we directly disassembled the machine to test the motherboard. When checking the tail socket, we found that a diode had disappeared.

Huawei P30 has no fast charge Figure 2

openPoint bitmapFind the location of the component, and find that it is an anti-static diode on the DP line. However, it will not affect anything if the diode is removed and not installed, but it will lose its protection function. When the valuable side of the diode is hit, it is found that the resistance value changes greatly, ranging from 5-600 to OL. After repeated value measurement and comparison, it is determined that this line should be in a state of breaking, which is definitely abnormal.

Huawei P30 has no fast charge Figure 3

However, there is just a TP3003 on the left side of the tail plug, which is the test point of DP line. When measuring the resistance of this test point, it is normal and there is no jump, so we can directly pull the line and fly over.

Huawei P30 has no fast charge Figure 4

After flying the wire, hit the resistance again to make sure there is no short circuit or no resistance, and then we will start the test.

Plug in the charger in the boot test can already show super fast charging, and the problem has been fixed. At the same time, we also determine that abnormal DP line will lead to fast charging.

Huawei P30 has no fast charge Figure 5

[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.