Tag Smartphone & Pad Repair Guide

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…

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:

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.

Customer describes that Apple iPhone 12 automatically enters recovery mode, since it does not boot.mobile phone You can enter the recovery mode, so let's not rush to repair the motherboard first, let's see if we can enter and exit the recovery mode and enter the system, or even brush the computer. The specific maintenance process is as follows:

Xiaomi 11 small current does not start, redo CPU failure is still the same. Xiaomi 11 doesn’t turn on the small current, and the peers have already done CPU, but the fault is still there, so let our maintenance master…

Huawei nova9 A9 turns on the bright logo and automatically restarts, and maintenance is found.mobile phoneThe resistance on the back of the battery is OL, which means that the wire is broken. We flew the wire directly, and after testing, we found that the mobile phone was turned on normally. How exactly is it repaired? Please see below:

Disassemble the machine first for testing, and the measuring switch tube 5V is also normal, considering that mobile phone I have fallen, so let's try to short-circuit the switch tube first. If the fault remains after short-circuiting the switch tube, then give priority to whether there is virtual welding of the charging inductor. The specific maintenance process is as follows:

IPad7 A2197 customer said that it would not be turned on when it was used, and directly removed the ammeter on the motherboard to see the current, and found that the standby current was normal. After triggering, the current was only 22mA. After looking at the CPU model, it was found that it was the commonly used A10 CPU. This CPU caused quite a lot of iPad with small current, which was a common problem, so the CPU was directly redone.

A Huawei Nova 7se that had been heavily dropped failed to charge, which was caused by inductance virtual welding after detection. See how the professional repairman repairs the maintenance steps below!