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zll

Joined: 2021-11-01
Articles: 531

Smartphone & Pad Repair Guide

IPhone12 Pro Max mobile phone does not show maintenance when it is turned on

The measurement shows that the 15th pin of the touch base is short-circuited. After replacement, the boot display is normal, and the fault is eliminated.

zll
2023-02-10

Blog

Gigabyte B75M-D3V R**.0 Point Bitmap

www.chinafix.com迅维网_GA-B75M-D3V-2.0点位图_00

Gigabyte B75M-D3V R**.0 Point Bitmap

zll
2023-02-09

Smartphone & Pad Repair Guide

Second repair glory x10 mobile phone does not display when turned on

Appearance inspection of motherboard, display ic and inductor have been replaced at home. Borrow a voltage of 1.8V directly according to the pin definition flying wire.

zll
2023-02-08

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

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 Schematics

IPhone12 phone can’t be turned on for repair due to heavy fall and deformation

IPhone12 phone can’t be turned on for repair due to heavy fall and deformation IPhone12 phone can’t be turned on due to heavy fall and deformation, and the power-on key 1.8 is actually only 0.21. According to past experience, change…

zll
2023-01-30

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