Professional cellphone repair guide and high quality cellphone repair tools

The customer sent us an iPhone7 Plus, the fault description was " stuck on the white apple", unable to enter the system, and the iPhone did not vibrate. How can we solve this phenomenon? According to our previous experience, the drop of the pad on the bottom of the audio chip may cause the white apple to get stuck on the system. Now we use the BGA Chip Burin Graver Scraper tool to remove the chip glue. Then, remove the large audio chip. And find that there is a drop after processing the pad. As shown in picture. The points found after comparing the point bitmap are all empty points and grounded points. Now, you can refer to ZXW DONGLE Circuit Diagram . As shown in picture. After reinstalling the audio chip,using a 3.5X-90X Stereo Zoom Microscope , so you can the procession more clearly. The machine enters into the system normally. We founfd that the vibration function is invalid in the process of testing. Observing the iphone motherboard and finding that the M2...

The customer sent us an iPhone 6S, the fault described is that when the Apple logo is launched, the iPhone screen turns black, and sometimes the iPhone 6S can enter the IOS system. According to the fault description, it seems to be a problem with the iPhone Nand flash , but it is not sure, so we need to flash the iPhone 6S to check the location of the flash progress bar. For the first time, iTunes will report a 4014 error when the first flash progress bar is completed. In this case, this is not a problem with the iPhone Nand flash. Based on maintenance experience, we know that a damaged external configuration can also cause this error. Take out the external configuration, just brush the iPhone motherboard , but the problem still exists. The co-worker feedback that the iPhone lighting cable has some problems, we need to flash the iPhone 6S for several times. So, we decided to flash the iPhone again. In this time, the flash process is successful. But we don't think the p...

One of my clients sent me an iPhone 6S. The customer said that the iPhone had fallen into the water. After testing, it said: the fingerprint could not be registered, the recorder could not work, and the audio device could not be found, which is the same as described by my client. May be damaged by water. How can we fix it? Disassemble the phone, finding the water in the upper part. Tear at the leatheroid and find that the right component and iphone fingerprint IC are badlt corroded. Then, cut off the shield to have a look. As shown in pictures. Using iphone opening tools to remove the corroded U4040 fingerprint IC, C4040, C4043 capacitor and R4041 resistor, and then,  rince thoroughly the replacement components. Now, the fingerprint function backs to normal. Next, we deal with the problem of sending the messages. U3500 audio chip looks very clean, but it is more safer of the water machine to remove the chip, you can also measure the pin resistance by the way. As sho...

We received an iPhoneX. The customer said that the iPhone has been repaired, but when the maintenance personnel disassembled the iPhone X rear camera, the pins of the camera socket were lost. He did not handle it well. We need to repair it. This is Repair process. Looking at the iPhone X motherboard under the stereo zoom microscope , we saw that some pads have been removed without heating, we are not sure if it is a pin tear or drop damage, and the iPhone X motherboard is slightly Deformation. First we should handle the solder pad of the J3900 camera socket, make it flat, apply the tin, and then soldering the jumper wire . After soldering the jumper wire by QUICK 861DW hot air rework station, apply some green UV oil to solidify it. Now apply the tin balls to the jumper wire, and then weld the socket. Next apply the tin to those pins that not connect well and soldering them to make them solidification. Install the iPhone X and test it, the iPhone X rear camer...

The customer sent us an iPhone 8 Plus, the fault description is that the iPhone 8P suddenly fails to start. Do you want to know how to fix it? Please read the following article. First of all, we use the mobile phone open tool to disassemble the iPhone, we found that the iPhone's motherboard has been severely deformed. Because the customer needs to keep the data, we have to fix the iPhone startup failure before we can back up the data. Connect iPhone motherboard to the DC power supply , it leaks 280mA. For the badly dropped damaged iPhone, we need to check iPhone motherboard to see if there are visible signs of damage to its appearance. Put iPhone motherboard under the Stereo Zoom Microscope to observe, we found the U3700 camera power supply IC is cracked, use tweezers to remove this IC first. After remove this U3700 IC , connect iPhone motherboard to the DC power supply again to check if it causes leakage problem. No leakage phenomenon when it is connected, next w...

We received an iPhone 6 Plus. The customer said that his iPhone 6 Plus was making no sound. There is no sound when playing video in headphone mode, and the distance sensor is also invalid when calling. As the customer said, the phone must be silent in headphone mode, since the sound is all out of the headphone; the telephone distance sensing in headphone mode won't work. The customer replaced the iPhone 6P charging port to exclude the outer parts problem, so we judge it's the motherboard problem. Now we are going to restart the iPhone to test, it will prompt the headphone mode when adjust the volume button during calling. This indicates that the phone insertion signal is abnormal and has been recognized as the state of the earphone insertion. When making a phone call, the input and output of the voice are all through the headphones. Generally, the iPhone 6 Plus audio IC U0900 or charging port would cause the trouble. The headphone insertion signal is plugged in...

A customer sent us an iPhone 6P. The fault description is that the iPhone 6 Plus backlight does not work properly, and the iPhone LCD has no display. The client tried to reboot, but this didn't work. He thought the iPhone was damaged inside and he needed us to repair it. After received the iPhone 6 Plus, we test it first. Press the iPhone power button to turn it on, the iPhone LCD screen has no response, but the iPhone 6P is turned on. We use the phone open tool to remove the iPhone. Then take out the iPhone motherboard. Looking at the iPhone motherboard, we found that the iPhone motherboard has been fixed. Next we placed it under a stereo zoom microscope and we found that the FL2024 has been removed. Checking the iPhone schematic by WUXINJI Dongle , we know that the inductor FL2024 is the cathode of the main light control. Now the FL2024 has been removed, so the iPhone backlight should not be normal. Assemble the iPhone display screen to the iPhone motherboard, and th...