Tag Smartphone & Pad Repair Guide

First, measure whether the 5V voltage of the tail plug is normal, and consider whether the charging IC and U2 on the motherboard are burnt out together. Because it is a double-layer motherboard, we will separate the motherboard first, and then measure it in layers to see if there is any abnormality in the resistance voltage of the charging IC and U2.

Huawei Mate 40 Pro, say yesmobile phoneI can't hear the sound on the phone recently, which affects communication with others when answering the phone, but it is normal to play music. So, what is the problem with this Huawei Mate 40 Pro? Look at how the professional master operates below!

The measured voltage is not generated. The first step of starting is to convert the battery voltage into the main power supply. The measured resistance of the main power supply is normal and there is no short circuit. Then we directly disassemble a charging IC of the same model and install it. The specific maintenance process is as follows:

Huawei Mate 30 Pro 4G version,mobile phone The fault is that the mobile phone does not display, you can hear the sound when you make a phone call and charge, but you can't see the screen display. In view of this problem, how should we deal with maintenance? The following professional maintenance master tells you!

The actual fault is that the phone can't be called because there is no base band, because Apple is above X.mobile phone They are all designed with a double-layer motherboard, and the base band is in the lower layer, so we can directly disassemble the machine for layering, which is caused by virtual welding of the upper and lower layers. After planting tin on the lower layer and attaching it to the upper and lower layers again, it is confirmed that there is no short circuit, and the installed button screen is booted into the system and found that the base band already exists, and the serial number is normal.

Xiao mi 11 WiFi can't be used. This kind of fault can still be said to be a common fault of Xiaomi 11. The pot of Snapdragon 888 is likely to be a fault caused by CPU virtual welding. The specific maintenance process is as follows:

IPad mini4 A1538 does not turn on or charge. “Machine model” iPad mini4 A1538 【 Fault Phenomenon 】 No power-on and no charging [Maintenance process] I received an iPad mini4 tablet, model A1538, which was sent by a customer for…

Huawei mate x2, the phone got water after getting wet, the speaker was hoarse, and the tail plug was changed after the sale; However, after a period of use, the mobile phone suddenly lost its signal, and the after-sales notification was a motherboard problem. After a series of problems appear, how to solve them? Then give it to our maintenance master!

Second, repair an iPhone 13 that won't turn on after a heavy fall. After disassembly, it is found that there is a concave layer on the lower layer of the motherboard. Observe by layers. The specific repair process is as follows: