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Category Smartphone & Pad Repair Guide

Smartphone & Pad Repair Guide

Smartphone & Pad Repair Guide

Huawei Mate 30 Pro mobile phone has no signal, and the search operator failed to repair it

The resistance value of one end of C1226 main power supply is also about 400. The main board has been changed, and it must have fallen before. The main board has no deformation area, so the main power supply is basically locked or the middle layer is soldered.

zll
2023-02-06

Smartphone & Pad Repair Guide

IPad Air3 A2134 startup dark screen without backlight repair

The measured voltage, inductors L82P0, L82R0 and diode D820D82P0 are all supplied with VCC 4V, but there is no boost. The large inductor and two diodes are directly replaced, and the base is back to 500, which is normal.

yx
2023-02-03

Smartphone & Pad Repair Guide

The charging of Huawei P20 mobile phone is abnormal, indicating that charging is not allowed for repair

The charging of Huawei P20 mobile phone is abnormal, indicating that charging is not allowed for repair In this case, the voltage output of capacitor c1610 in the measurement schematic diagram is abnormal, so coil L1600 should be excluded first, and…

zll
2023-02-01

Smartphone & Pad Repair Guide

Repair of Redmi note8Pro mobile phone without taking pictures when it enters the water

Non-photographing caused by water inflow is mainly power supply corrosion and i2c corrosion.

zll
2023-01-31

Smartphone & Pad Repair Guide

5G Glory 50 mobile phone enters the water without service repair

Focus on the inspection of the periphery of the 4G power amplifier chip. After careful observation, it is found that there are corrosion marks around a chip on the right side of the 4G chip, and there is a small amount of electrolyte. Redo this chip.

zll
2023-01-29

Smartphone & Pad Repair Guide

Redmi Note8 mobile phone does not show maintenance on the water inlet boot screen

Disassemble the shield and find that there is corrosion above the chip. There is also some corrosion when the inductor foot is removed. This is the boost inductor of the display input, so replace it directly.

zll
2022-12-29

Smartphone & Pad Repair Guide

IPhone XR phone is not charged for repair

Measuring that the pp_vbus1_e75 of U3300 has 5V when the motherboard is disassembled, and the battery holder has no voltage, so it is preliminarily judged that the charging IC U3300 is broken. Cooling installation test, charging is normal, troubleshooting, and maintenance is over.

zll
2022-12-28

Smartphone & Pad Repair Guide

The mobile phone can’t adjust the backlight brightness after changing the screen of VIVO iQOO UI

After changing the screen of VIVO iQOO UI, the mobile phone can't adjust the brightness of the backlight. This backlight is the brightest state and cannot be adjusted. Most of the circuits are damaged, so it can't give the reference voltage to the light control IC. Therefore, the CPU outputs with the rated voltage of the backlight.

zll
2022-12-27

Smartphone & Pad Repair Guide

Huawei 5G Nova6 mobile phone enters water without service repair

The measured capacitance of corrosion at startup is 1.8V, and the measured capacitance is 2.4V This circuit is connected to the signal chip of the main board, the upper board and the tail plug-in board. Redo this chip, and the power-on test voltage is restored to 1.8V. Boot test, perfect repair.

zll
2022-12-23