Category Smartphone & Pad Repair Guide

IPhone XS Max was not turned on, and it was found that there was no baseband after replanting CPU. After adding a new capacitor, the fault was fixed.

After taking out the mainboard and measuring that there is no obvious short circuit, power on it with a regulated power supply, and the current is triggered to jump at 100mA. This current power supply has obviously worked, and the current is cyclic jumping back and forth, and the jumping range is not large. Therefore, it is judged that it is a fault of CPU virtual welding. The specific maintenance process is as follows:

After the iPhone XR phone was accidentally dropped, the WiFi could not be opened. The initial judgment was that the phone was hit and the cable was loose. The following is the specific maintenance process:

After power failure, the resistance of L2501 is measured, and it is found that the front resistance is 380, but the back resistance is only 290. We can measure the front and back ends on C2502 and C2506. Does this seem to be inductance damage? The specific maintenance process is as follows:

repair of iPad8 Black Screen Fault “Machine model” iPad8 (A2270) [Fault Phenomenon] The customer described that the tablet iPad8 suddenly went black when it was in use. The customer thought it was out of power, so he found a charger…

Measuring the resistance of the main power supply is 0, which shows that the battery voltage is short. When measuring the battery voltage, it is found that it is only 2.6v This voltage must be a battery loss. The specific maintenance process is as follows

iPhone 13 Pro Maxmobile phone repair without charging “Machine model” iPhone 13 Pro Max [Fault phenomenon] The customer described that he put his mobile phone on the bedside before going to bed at night, and as a result, he got up…

The second repair of Huawei P40 Pro did not start, and the peer described that the fault was still repaired repeatedly. After the repair by Xunwei maintenance master, it was found that the maintenance was not complicated, but a simple problem of tin connection.

iPhone12mobile phoneThere was no signal after the heavy fall, and the mobile phone was tested as baseband-free. Since the fault point has been found, the maintenance method is also very simple. Directly clean the residual solder on the middle and upper boards, replant the tin on the middle layer and attach it.