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Category Blog

Laptop Repair Guide

It is not a common fault that Lenovo Y7000 notebook can not be powered by CPU when it is not turned on

After checking the drawings and measuring, it was found that the south bridge was damaged, and the return signal from the south bridge to the CPU was not processed, which led to the failure of the CPU power supply. The south bridge was replaced, and the power supply came out. Installation, startup test, perfect lighting, troubleshooting, and maintenance are over

yx
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

Blog

Alien M17 notebook does not respond to repair when it is turned on

The external resistance of pin 5 CS2 of the control chip TPS51225 of 3VALW is changed to 10K, but the fault wave pattern remains unchanged. After replacement, power-on test is conducted, and the machine is normally turned on for display, troubleshooting and perfect repair.

yx
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

Laptop Repair Guide

Asus VM510L notebook maintenance without charging

Asus VM510L notebook does not charge, magnifying glass observes that one end of PR8815 resistor link PR8814 is corroded, and the voltage is normal after adding some solder, so replace it with a good PR8814. Bare-metal test starts charging for 20 minutes, everything is normal, troubleshooting, and maintenance is over.

yx
2022-12-23

Blog

X mobile phone WiFi can’t be opened for repair

The iPhone X can't be opened for WiFi. It can be solved by flying a wire between WiFi and the pad.

zll
2022-12-22

Laptop Repair Guide

Lenovo ThinkPad T460 notebook is not charged and its screen flashes for repair

Lenovo ThinkPad T460 notebook is not charged and its screen flashes for repair Lenovo ThinkPad T460 notebook doesn’t charge, and its screen flashes. Check the back end of PR49 to find DOCK_CONSUMP, which has a resistance value of more than…

yx
2022-12-22

Desktop PC Repair Guide

Gigabyte GA-H110M-DS2V REV: 1.0 Very fast repair when power is off

Gigabyte GA-H110M-DS2V REV: 1.0 Power on and power off are very fast. Remove the two capacitors OBC15 and OBC16, and find that 2_ The resistance of 5LEVEL to the ground increases a lot. The resistance at both ends of OBC15 is measured, while the resistance at both ends of OBC16 is infinite. The OBC15 is not installed directly, and it is OK to turn on the machine.

lqy01
2022-12-21

Smartphone & Pad Repair Guide

IPhone XS mobile phone maintenance without service failure

IPhone XS mobile phone maintenance without service failure Machine model: iPhone XS Malfunction: No service on mobile phone. Maintenance process: An iPhone XS mobile phone, the fault is that only 3G signal is plugged into Unicom card, and there is…

zll
2022-12-21