iPhone X WiFi signal is not easy to repair

iPhone WiFi signal is not easy to repair

Hello, everyone. Welcome to the Xunwei case sharing. First of all, I would like to thank Li Shifu of Xunwei Technology Group for providing the sample materials.
Today, we will discuss the maintenance ideas of an Apple X fault.
Machine model: iPhone X
Customer description: The mobile phone fell slightly, and nothing happened to the appearance, but the WiFi signal was very weak.
Malfunction: the WiFi signal of mobile phone is not good.
Actual measurement results: The appearance of the mobile phone is not damaged, and all functions are normal, but the WiFi is weak.
Fault analysis: The key point of this fault lies in the fall. Because Apple X is a double-layer motherboard, the signal parts are all on the lower motherboard, which may cause the signal chip Inveracious Soldering or signal components to be damaged.
First, open Xinzhizao Soft software to find the chips and components related to WiFi signals.

iPhone WiFi signal is not good. repair Figure 1.

As you can see, the signal parts are all on the lower motherboard. But separating the upper and lower layers can be very troublesome. Therefore, first, according to the instructions of the drawing, look up the BTB connector bit of WiFi signal of the upper ANT BTB connector and the lower ANT BTB connector. Measure ANT BTB connector ANT, and find the WiFi 2G BTB connector bit ANT OverLoad of ANT BTB connector, which should be the cause of the fault.

iPhone WiFi signal is not good. repair Figure 2.

Because this pin is connected to ANT Switch next to WiFi chip through resistor R7701. Therefore, it is necessary to separate the motherboard. After separating the motherboard, measure ANT BTB connector to AN AN Jump wire,PCB circuit defect and repair it perfectly.