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Category Blog

Smartphone & Pad Repair Guide

Huawei Mate 20 Pro has no signal (coaxial cable is loose)

A Huawei Mate 20 Pro with poor card signal and sometimes disconnected network.mobile phone When disassembling the machine, it was found that the coaxial line between the main board and the tail plug-in small board was loose. After plugging the coaxial line again, the test signal returned to normal after starting the card.

zll
2023-07-05

Laptop Repair Guide

Dell G7 does not boot (damaged bridge)

When measuring the main board inductance with single board, it is found that the bridge's resistance of 1.05V is 0, which indicates that there may be something wrong with the bridge. Other inductance resistances are normal when measured. If the bridge is burnt with 1V, the bridge will be locked for short circuit damage. The specific maintenance process is as follows:

zll
2023-07-04

Smartphone & Pad Repair Guide

Apple iPhone 12 doesn’t turn on

Apple iPhone12, the fault is not turned on,mobile phoneIf you fall, you won't turn it on, and there is no response when you plug in the data cable; Because it is a fallen machine, we have to consider whether there are other problems caused by virtual welding in the middle layer, so we directly layer it. See below for specific steps:

zll
2023-07-04

Smartphone & Pad Repair Guide

Redmi K40 restarts automatically (the bottom of the font is damaged)

Redmi K40 restarts automatically (the bottom of the font is damaged). What is the problem with a Redmi K40 that can’t automatically restart into the system, which makes this Redmi K40 like this? Want to know the details, let’s have…

zll
2023-07-03

Blog

Lenovo ThinkPad NM-C641 power-on and power-off point is not bright (the battery current detection resistor circuit is burnt out and the charging IC is damaged)

Lenovo ThinkPad NM-C641 power-on and power-off point is not bright (the battery current detection resistor circuit is burnt out and the charging IC is damaged). Fault model: Lenovo ThinkPad NM-C641 Fault phenomenon: the power-on and power-off point is not bright.…

zll
2023-07-03

Laptop Repair Guide, ASUS

ASUS S5D does not boot (0CPU power supply tube breakdown)

ASUS S5D does not boot (0CPU power supply tube breakdown) ASUS S5D does not turn on the machine, and the motherboard is removed for measurement. If it is found that the common point is short-circuited, the machine can be directly…

zll
2023-07-01

Smartphone & Pad Repair Guide

Troubleshooting of Apple XR Plug-in Data Cable Failing to Charge

Apple XR, the fault phenomenon is that the plug-in data cable is not charged, and there is no current in the plug-in. We directly smoke rosin on these two paths, and then apply a voltage of 5V to PP_VBUS1_E75 to burn the machine. The specific maintenance process is as follows:

zll
2023-07-01

Laptop Repair Guide

Lenovo rescuer R7000 does not boot (5V secondary voltage is damaged)

Lenovo rescuer R7000 does not turn on the machine, and measures the resistance of the main power supply inductor before powering on. It is found that the resistance of 5V is only 40 ohms, which is obviously abnormal. The specific maintenance process is as follows:

zll
2023-06-30

Smartphone & Pad Repair Guide

Xiaomi CC9 Pro logo (set logo caused by virtual welding of kit)

A Xiaomi CC9 Pro, with a video brush, suddenly got stuck and crashed. When it was turned on again, the power-on key was lit and stuck in Xiaomi logo, and it could not be turned off.

zll
2023-06-30