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Quickly solve! Apple iPhone11 doesn’t turn on

飞速解决!苹果iPhone11不开机 2
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 does not display

华为Mate 30 Pro 4G不显示
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!

Apple iPhone 12 Pro MAX suddenly lost the signal, and changing the card is not good?

苹果iPhone12Pro MAX突然没信号了,换卡也不行?
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.