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zll

Joined: 2021-11-01
Articles: 531

Blog

Xiaomi MIX2 mobile phone starts slowly, and the speaker can’t be recorded and repaired without sound.

Xiaomi MIX2 mobile phone starts slowly, and the speaker can’t be recorded and repaired without sound. Machine model: millet MIX2 Malfunction: the phone starts slowly. Maintenance process: I received a Xiaomi MIX2. The fault description shows that the mobile phone…

zll
2022-12-12

Blog

Huawei Mate30 Pro mobile phone WiFi can’t be repaired

It was found that two capacitors had been replaced. These two capacitors must be 220 nanofarads, and the difference between them should not be too great. Two 220 nanofarads were decisively replaced, and the fault was eliminated, and the signal was instantly full.

zll
2022-12-10

Smartphone & Pad Repair Guide

IPhone 11 mobile phone can’t be started for repair.

Measure the short circuit to BOOST path, replace this capacitor, start the test, turn on the machine perfectly, troubleshoot, and repair it.

zll
2022-12-09

Blog, Smartphone & Pad Repair Guide

Huawei nova3 mobile phone can’t be started for maintenance when it enters water.

Huawei nova3 mobile phone can’t be started for maintenance when it enters water. Machine model: Huawei Nova3 Malfunction: the phone does not turn on when it is flooded. Maintenance process: I received a Huawei nova3, and the fault description shows…

zll
2022-12-08

Smartphone & Pad Repair Guide

Note7 Pro mobile phone can’t be turned on, and the charging icon is displayed for repair

After measurement, it is found that the output voltage of the power chip is abnormal, but the input voltage is normal, which proves that the power chip has been damaged. After the replacement, the boot is normal, the fault is eliminated, and the maintenance is over.

zll
2022-12-07

Smartphone & Pad Repair Guide

Xiaomi’s 8-fold mobile phone WiFi can’t be opened for repair

Dismantle the machine, remove the motherboard and observe carefully, and find that the motherboard is broken. After the flight, the power-on test shows that the WiFi signal is full instantly.

zll
2022-12-06

Smartphone & Pad Repair Guide

Xiaomi 10 Pro mobile phone does not charge repair

It is found that the motherboard is burnt, and the resistance of USB 5V terminal is measured as 0. Cure the bone, scrape off the burned slab, and the resistance value comes back. Short circuit B3/A2 pin of Q5400, charging is normal, and the fault is repaired.

zll
2022-12-05

Smartphone & Pad Repair Guide

Heavy Samsung W2020 folding screen mobile phone without charging repair

Exclude tail plug and tail plug flat cable. Measure the resistance of 5VUSB channel, and fly the wire to the input of charging IC.

zll
2022-12-01

Smartphone & Pad Repair Guide

IPhone 12 Pro Max cannot be started for repair

IPhone 12 Pro Max cannot be started for repair Machine model: iPhone12 Pro Max Symptom: The phone cannot be switched on Maintenance process: A faulty iPhone 12 Pro Max machine was received. The fault description is that the phone can’t…

zll
2022-11-30

Smartphone & Pad Repair Guide

IPhone XS Max phone screen intermittently does not show repair

First, replace the screen. After replacement, the fault remains the same. Check the PCB wiring position through the wiring diagram of Xinzhi Manufacturing Board Layer. Scrape the PCB board, reconnect the lead of PMU_TO_DISPLAY_RESET_CONN_L, and repair the fault.

zll
2022-11-29