iPhone X can't be turned on

iPhone X can’t be turned on.

Machine model:iPhone X

Malfunction:iPhone X can’t be turned on. After being sent for repair, it can’t be connected to WiFi, and Camera can’t be turned on and charged.

iPhone X can’t be turned on Figure 1.

Maintenance process: after disassembling the machine, it was found that the previous home had not repaired it well, and a bunch of Capacitor chips were knocked out. After powering on short-circuit current A, a bunch of chips next to the flash IC were found out to be crooked after separate, which was righted again. After installing Capacitor, the current of 50 mA went to zero.

iPhone X can’t be turned on Figure 2.
Found CPU The solder tin extruded. After redoing the CPU, it started normally, but there were more than short-circuit current 500 no SIM in the lower layer.Current heating test found WiFi and 1.8V V Inductor. After replacing WiFi to straighten Capacitor,welding found that no SIM and no serviecs would jump. This is generally caused by the failure of high and low frequency chips. After replacement, the test was normal. It was found that the mobile phone was not charged again. After changing two charging Short circuit, the charging was normal.

iPhone X can’t be turned on Figure 3.
Test the battery without data, test the battery holder Diode value is normal, replace the battery, test the computer again and find WiFi poor reception, then remove the motherboard and find that the upper ANT BTB connector is tilted. After reinstallation, the WiFi signal is normal.