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zll

Joined: 2021-11-01
Articles: 531

Laptop Repair Guide

Lenovo Xiaoxin 15 2019CPU frequency down lock 0.4GHz (overheating detection signal is pulled down)

Lenovo Xiaoxin 15 2019, the fault is that the CPU down frequency locks 0.4GHz. This kind of frequency reduction and frequency locking is usually caused by a problem with PROCHOT's signal. We can find it directly.blueprintTo determine the signal position to repair, how to operate specifically, see the following detailed explanation!

zll
2023-07-20

Smartphone & Pad Repair Guide

IPhone 7Plus does not turn on (short circuit of power supply of power amplifier)

IPhone 7Plus does not turn on (short circuit of power supply of power amplifier) [Fault model] iPhone 7Plus [Fault phenomenon] No boot. [Maintenance process] I received a machine sent by a customer for repair, the model is iPhone 7Plus, and…

zll
2023-07-20

Smartphone & Pad Schematics

The Schematic, Circuit Diagram PDF file for Schematic diagram of Redmi 6A motherboard

The Schematic, Circuit Diagram PDF file for Schematic diagram of Redmi 6A motherboard. File info Pages: 34 Format: PDF File Size: 629KB Schematic Preview Schematic diagram of Redmi 6A motherboard Download Download XinZhiZao maintenance software to view the full Schematic diagram…

zll
2023-07-19

Laptop Repair Guide

Gigabyte 2080Ti is not displayed (core open signal is not generated)

Gigabyte 2080Ti doesn't display it. After the graphics card is removed, check the resistance of each inductor first. No problem is detected. The current can only be up to 000 mA with the conversion board. This current core is not working, and the voltage is measured when it is powered on ......

zll
2023-07-19

Smartphone & Pad Repair Guide

IPhone 7 restarts (1.8V power supply is pulled down)

IPhone 7, the fault is that the white apple can't restart into the system. When the single board of the machine was powered on, the current triggered the take-off to be normal, and it was restarted at 300mA. I immediately thought of the common fault of the seventh generation, and the bad audio led to the restart of the white apple. However, the specific reasons have to be analyzed in detail, so as to solve the problem, then learn more about it!

zll
2023-07-19

Smartphone & Pad BoardView

The Schematic, Circuit Diagram PDF file for Samsung I9050 original drawings

The Schematic, Circuit Diagram PDF file for Samsung I9050 original drawings. File info Pages: 67 Format: PDF File Size: 15.2MB Schematic Preview Samsung I9050 original drawings Download Download XinZhiZao maintenance software to view the full Samsung I9050 original drawings.

zll
2023-07-18

Desktop PC Repair Guide, Laptop Repair Guide

Blue sky motherboard gaijixian maintenance

Blue sky motherboard gaijixian maintenance Motherboard model: NH50DPMB-0D Motherboard failure: the graphics card PEXVDD power supply burned, and the core was taken away. Main board maintenanceProcess: The burnt area is too large, and it can’t be repaired by itself. Communicate…

zll
2023-07-18

Smartphone & Pad Repair Guide

IPhone 11 does not boot (main power supply is short-circuited, U2 is damaged)

A second-repaired iPhone 11 failed to turn on. The second repair machine means that the last one was not repaired, and then it was sent to us for quick repair, which proves that our maintenance master is quite hard-core, so let's see how hard the professional maintenance technology of the maintenance master is!

zll
2023-07-18

Smartphone & Pad BoardView

The Schematic, Circuit Diagram PDF file for Schematic diagram of Huawei MATE9 PRO_ motherboard

The Schematic, Circuit Diagram PDF file for Schematic diagram of Huawei MATE9 PRO_ motherboard. File info Pages: 360 Format: PDF File Size: 2.90MB Schematic Preview MSI Motherboard 7640-14-0622 Schematic Preview Download Download XinZhiZao maintenance software to view the full Schematic diagram…

zll
2023-07-17

Laptop Repair Guide

Lenovo rescuer Y7000P turned on and turned off (lack of single display power supply)

Lenovo rescuer Y7000P, power on and power off after triggering. Generally, when you get a computer, first disassemble the motherboard, and then measure the major inductance resistance of the motherboard to see if there is any unreasonable place for maintenance. Let's take a look at the detailed explanation below for the specific operation!

zll
2023-07-17