Professional cellphone repair guide and high quality cellphone repair tools

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...

What should I do if I can't use WiFi on my iPhone? This means that we are very inconvenient when we use the iPhone, especially when we watch videos and play games. Our customers have encountered this kind of thing. He sent an iPhone 6P motherboard with a white WiFi fault. After getting the motherboard, we must first test the fault. 1. Install the iPhone board to measure all the functions, we have determined that the fault is on WiFi, all the other functions are all normal. The clock is also working properly. 2. According to our previous mobile phone repair experience, we confirmed that the only problem with the iPhone 6P is WiFi failure. 3. Take the motherboard to observe under the LED stereo microscope , we found that WiFi had no cracks and no pressure. 4. Prying down WiFi we found no breakage or dropping point. 5. Replace the iPhone 6P WiFi module . 6. After replacing the WiFi module, we found that the WiFi signal is weak. 7. Connect the Wifi, 2G, 4G with ju...

Our customer sent an iPhone that needs repair. The fault described by the customer is that the iPhone motherboard is deformed, water is damaged, the layer is broken, and the fingerprint is faulty. And this iPhone 6 has a white Apple failure. What can we do to fix this fault? After we received the iPhone motherboard, measure the iPhone motherboard. Connect iPhone motherboard to the DC power supply , the boot current is large, the failure is iPhone 6 white Apple and large boot current. We need to detect the iPhone motherboard carefully, （put it under the microscope to observe, no specific faults found ） Based on our previously repair experience, when measure the resistance value of the USB by digital multimeter , the resistance value turns down. Use Titanium Alloy Tweezers to remove the USB IC, the boot current measured is normal, so we replace the USB IC directly. After replacement, assemble the iPhone 6 and test, all functions are fine. If you need any other iPho...

A customer sent an iPhone 6S motherboard , and his iPhone6S screen showed half of the black screen. The fault still exists after the power is turned on. what should we do? After receiving the board, we are going to install to test it first,  the right screen is not bright as the left side, so the iPhone 6S screen fault is confirmed now. As shown in picture. First check the display base J4200, we didn't find any problem from the appearance. When the resistance to the ground is measured by a Fluke digital multimeter , the resistance values of 1# and 3# are the same, and there is a connection between 1# and 3# by measuring, it is judged that there is a tin link between the two pin. Clean the black glue around the base, tin ball is seen between the two circuit, leading to the two circuit connecting. This is the main cause of the failure of half black screen. As shown in picture. At last, gently remove the tin ball and install the iPhone 6S motherboard to test. ...

One customer sent us an iPhone 6. The problem is that the iPhone 6's receiver has no sound. When the iPhone receives the call, we can't hear any sound from the receiver, it just keeps silent. We used another phone to call this iPhone, the ringtone was normal, but there was no sound when we answered the call. Is there any way to solve this problem? Please read below. Disassemble the iPhone 6 Use phone opening tool to disassemble the iPhone 6, take out the iPhone motherboard . Observe the iPhone motherboard Observe this iPhone 6 closely with our eyes, the iPhone motherboard has been repaired, the motherboard has traces of water. Remove the iPhone big audio IC  Put iPhone motherboard under the Stereo Zoom Microscope , and then use tweezers to remove the iPhone big audio IC. After remove the iPhone big audio IC, we found the bottom pin was corroded. As shown in picture. Clean the corroded place Use the BGA remove graver to clean the corroded part. Sold...

I believe that everyone likes to take pictures with the iPhone, because the iPhone has high pixels and clear pictures. Especially the iPhone's rear camera takes better pictures. But have you ever encountered an iPhone 6 rear camera that cannot be used? Our customers are in such awkward situation. His i Phone 6S rear camera is not available. What can we do to fix this fault? After receiving the iPhone 6S, we need to install and test to confirm the failure. The detailed steps are as following: 1. First of all, use iPhone 6S opening tools to disassemble the phone and remove the motherboard to observe carefully. 2. After we remove the motherboard, we found that the board is good, and the real camera socket is also pretty. 3. Next we have to check the motherboard and test the resistance of the socket with a Fluke digital multimeter . We found that the 13 pin of the socket have no resistance. 4. The 13 pin is communicant to the FL3110 beside WiFi chip, the inductance is o...

We received an iPhone 6S from a customer. He said that his iPhone was shorted after booting. Observing the iPhone 6S motherboard, it seems that it has never been repaired. Connect iPhone motherboard to the DPS DC power supply , the current of the beginning tested is 20mA, it's normal. When the current jumps to 40mA, which means the iPhone power and CPU starts to work. When the current jumps to 10.6mA, which mean the upper was opened. When the current jumps to 70.8mA, which means the iPhone Nand flash starts to work. When the current jumps to 100mA, which means the CPU starts the I2C data bus, at this time, the iPhone display power IC start working, the Apple LOGO will appear on the iPhone display screen, and then the iPhone backlight start to work. At this time, the current is usually around 300mA. When the Apple logo appears, the current on the DC power screen continually jumps as the iPhone baseband and iPhone WiFi are starting. After the iPhone screen is lit, the cur...

We received an iPhone 6S, and the customer said that his iPhone would not ring when the phone came. What should we do？ How to test and repair it step by step? Let's take a look at this article! First of all, we install the iPhone 6S motherboard to test whether there is any vibration without bell, because ringing and vibration are closely related. It is found that the vibrating bell is not entirely absent, there a little sound just click it, then the sound disappeared at soon. For this kind of situation, we can give priority to check the iPhone 6S bell boost in this respect, observe under the LED Stereo microscope , we found the L3700 bell boost a little blackened. The picture are shown as as follows: Replace a new L3700 coil, install the iPhone to test again, the ringtone fault is perfect solved now! (general coil without direction and model difference, can be commonly used) Do you find this article useful? If you need more maintenance tutorials, please conta...

Today we received the iPhone 6 Plus from the customer. This iPhone 6S has no baseband and there is no Moderm firmware on the iPhone settings. Why is this happening? This will affect us to use out mobile phones. We use the phone to open the tool to disassemble the iPhone and remove the iPhone motherboard. The iPhone motherboard looks good. Put it under the microscope, carefully open the CPU shield by Titanium Alloy Tweezers , and then use digital multimeter to measure the resistance value of the bottom pins of the baseband power, the data tested is normal. Remove the old iPhone baseband power supply, then install the new iPhone baseband power supply, after the replacement, test the iPhone still has no baseband. Now, remove the shield of the iPhone baseband CPU . Under microscope, there are traces of corrosion in the iPhone amplifier power supply IC. Use QUICK 861DW hot air rework station to heat iPhone amplifier power supply IC, and then take off the iPhone amplifier pow...

Received an iPhone 6P from our customer, the customer said the motherboard is damaged, the problem is in the touch part of the display, the touch is not responding. First of all, what should we do? After install the motherboard to test, we found it's blurred screen, like a snowflake flash, and then black screen, reboot and test again but completely did not show anything on screen. But from the fault mark inference should be able to cross the interface but not touch, however, it can not display now, we judge that the problem in the display part of the probability is greater. The display base is nice and the ground resistance is measured normal with Fluke digital multimeter http://www.vipfixphone.com/digital-multimeter-repair-136_88/fluke-15b-high-performance-digital-multimeter-for-mobile-phone-repairs-fixphone-3425.htm . After careful observation, it is found that the shield cover of the main CPU has a little pressure and cracks at the solder joint. Remove the shield...

We received the iPhone 6S from our customer. The problem is that when the iPhone is recording, there is noise and the recording quality is not good. This iPhone motherboard was fixed once and we suspect that the motherboard is still faulty. How can we fix it? Fault analysis： The customer said there is a murmur when the iPhone was recording, first, we need to install the iPhone motherboard to detect whether the iPhone external configuration has some problem. After detecting, the fault of the iPhone is exactly what the customer described. According to our repair experience, generally, the iPhone tail plug socket J4600 or iPhone big audio U3500 all will cause this fault. When facing this problem, usually, we can first remove the sponge from the iPhone tail plug socket J4600 to see the capacitance resistor inductance underneath. We can observe it under the Trinocular Integrated Microscope. Fault found: After remove the sponge, we found the FL4601 and FL4611 resistor fall ...

The customer sent an iPad Mini2, which can be turned on normally. The only drawback is that there is no backlight and no display on the screen. What should I do if there is no display on the iPad Mini2 screen? What are the causes and solutions? I will analyze it with you below. Open the iPad Mini 2 to observe, we can see that the lower half of the motherboard is water damaged. Check the motherboard under the magnifying glass carefully. The power supply and the display interface are corroded badly. First we deal with the power part, and then carefully deal with the display interface, because this iPad is the display and backlight problem, when finished processing, one of the resistors fell down, check the schematic diagram on WUXINJI dongle , we found it's the light IO data interface, this resistance is 1 ohm. After shorting the jumper, measure the ground resistance at the display interface with a Fluke Digital Multimeter . Four locations were found where the resistance o...

If the phone can't be charged, it feels bad. Have you experienced this situation? We received an iPhone 6S and it can't be charged. We found that the iPhone 6S motherboard had a slight water phenomenon, which caused the iPhone 6S to fail to boot. After the repair, the iPhone 6S can be opened normally. However, the iPhone 6S does not charge, the charger does not respond when inserted, there is no sign of charging, the iPhone can be connected to the computer. What should we do  to repair it? Frist ,we use Stereo Zoom Microscope to observe the iPhone charge circuit, there are no visible signs of water damage on iPhone tail plugs. Considering that the upper part of the iPhone motherboard has water damage，and the iPhone can be connected to the computer, according to the previously repair experience, we should focus on the water damage circuit of the iPhone motherboard. Check it carefully, we find the resistor R4510 is corroded by water. After check iPhone 6S schemati...

Did your phone fall into the water? How do you do it? Do you know how to fix it? We received an iPhone 6S. He once dropped the iPhone into the water. It could not be turned on. After observation, we found that the power IC was partially corroded. We have to repair it immediately. After cleaning the corroded part, it still won't turn on. The leakage is 6 Ma and the starting current is 50 ma by measuring with DC power supply . Due to the fact that IC is more likely to cause this failure, we are going to remove it to retest, the problem is solved now. Then replace the display IC and install to test function. All functions are normal, but it can not charge and also can not connect to the computer now, after replacing U2 u2300, fault still exists, then remove the shield cover, measuring its IC side circuit, we found that the end of the capacitor c2300 corrosion blackened. After checking the drawing on the WUXINJI dongle , it was found that the capacitor could not be removed...

Have you ever experienced a situation where you can't start the iPhone 6s? How did you deal with it? One of our customers sent us an iPhone 6S. The problem with this iPhone 6S is that it can't be turned on. After receiving the iPhone 6S, we tested it. The iPhone 6S looks good, pressing the iPhone's power button as usual, the iPhone 6S doesn't respond. Charging the iPhone 6S, it didn't react at all. What is the cause of this failure? How do we fix it? If you are interested, please see below. By disassembling the iPhone 6S and connecting the iPhone motherboard to the DPS DC power supply , we found that the current card was at 50mA, which is not normal. Take out the iPhone motherboard, check the appearance of iPhone motherboard, there is no water damage or drop damaged phenomenon. Put it under the Trinocular Stereo Microscope , and observe carefully, we found there is a bruise next to the iPhone Nand flash that hit by screws. As shown in picture. Scra...