Professional Cell Phone Repair Guide

The customer said that he did not know what the reason was. The mobile phone has been restarted indefinitely and can enter the DFU mode. However, when the flashing machine fails to enter the recovery mode from the DFU mode, and then the mobile phone is connected to the computer for 5-10 minutes, it automatically enters the recovery mode. After we received the 6S that could not be started, we disassembled the power with iphone engraving tool and turned on the power to 100mA. First of all, check if you can connect and read the DFU mode after connecting to the computer. Wireless DFU can not exit, we can only brush the machine to view the error. Refresh Aisi and iTunes respectively. If you stuck on the progress bar for a long time, it is very likely that the error is -1. If the progress bar does not enter, you can roughly determine the probability of a CPU failure. Now we need to see if there is a problem with the hard drive. First, use DC power supply for iphone repair, the hard disk o...

When using the iPhone6, there may be occasions when there is no service. So how do you solve this problem?  Received a faulty iPhone 6 phone from the customer, customer description: often no service, display search signal on the iPhone display.  Detailed description When the iPhone is in the no-service state, there is no IMEI after dialing *#06#. According to our previous repair experience, it may be due to the RFFE1 and RFFE2 bus of the iPhone baseband   causing this iPhone to have no service failure.     By examining the iPhone schematic with WUXINJI Dongle , we found that the two sets of buses are the various ICs that the baseband CPU uses to manage the signal portion. For a lost iPhone, the circuit of RFEE1_DATA to the U1 pin is usually disconnected.  Use the phone opening tool to remove the iPhone and remove the iPhone motherboard. Then use the QUICK 861DW hot air rework station to heat the iPhone baseband, then remove it with tweezers ...

Recently, some customers have reported that there is a problem with charging with the iPhone5 and cannot be charged. How to deal with it? The customer didn't give us much description, they just said that the iPhone 5 is no longer fully charged. We started repairing the faulty phone. As you know, the charging part of the iPhone 5 consists of Q2, U2 and U7. As shown in the figure, we can query the circuit diagram of charging port J7 on the WUXINJI dongle . The 5V voltage from the tail plug sends two 5V power supplies through Q2. PP5V0_USB_PROTECT and PP5V0_USB_RPROT are sent to U7 and U2 respectively. In addition, there are two detection pins in the middle of the battery contact J6! They are sent to the power IC-U7, FL10, FL11 through FL10 and FL11 respectively. In the actual mobile phone repair, it is found that the two pins are easy to fall off, and the mobile phone cannot be charged! And restart again and again! If there is a charging problem, please insert the data c...

Apple phones have always been favored by consumers because of their smooth system and powerful functions. But there is no gold in the red, the characters are perfect, and the perfect mobile phone will be flawed. Recently, mobile phone users of iphone 6 plus have reflected The iPhone 6 Plus WIFI switch does not turn on after the line is dropped, which means that the iPhone WIFI function cannot be used. How to do with it? Repair process: First we started the iPhone 6 Plus for testing. To our surprise, when I entered the IOS test iPhone, except for the iPhone WIFI, the iPhone WIFI icon could not be opened and all functions worked fine. Where is the problem? So we use the phone open tool to remove the iPhone 6 Plus, remove the iPhone display component, disconnect the iPhone battery, and then remove the iPhone motherboard.   Looking at the iPhone motherboard under the stereo zoom microscope , we found that there were some problems with the iPhone WIFI IC. Use the QUICK 861...

Apple phones have always been one of the most popular smartphones in the world. Their functionality and hardware performance are also getting stronger with the iterative upgrade of models. But most people have a problem with mobile phones.  The customer handed us an iPhone SE. The fault described is that the phone is very short and cannot be restarted.     After receiving the mobile phone, first use the mobile phone opening tool to remove the motherboard and feel the hot spot by hand. However, the position of the heating element is not obvious.  Apply some rosin to the motherboard and reconnect the DC power supply . We still can't find the faulty part. The circuit is switched from the battery to the main power source through the conversion tube Q2300.  Remove the Q2300 and measure the grounding resistance with a Fluke multimeter   to see if there is a short circuit in the battery or mains. A short circuit was found in the main power connecti...