Professional cellphone repair guide and high quality cellphone repair tools

For most people, cell phones are an important way to keep in touch with the outside world. If there is no signal on the mobile phone, we can't make a call and receive a text message. It feels like we're cut off from the world. Some iPhone 7 users report that their mobile phones no 4G Signal after water damage. What can we do to repair it ? We received an iPhone 7 device, after inserting SIM card in, it only diaplays 2G signal instead of 4G signal. If there is only 2G signal on the mobile phone, which indicates the 4G signal parts get some problems. This situation only happens after your cell phone taking water in, the water damaged part is in the 4G signal channel. Water damage caused insufficient power supply of 4G power amplifier, resulting in no 4G signal. First , use iPhone repair tool kit to open the device, and remove the motherboard to observe under HDMI camera stereo microscope , but we can't see nothing from it, so remove the 4G power amplifier chip.

Many iPhone 7P users complain that the iPhone 7P won't turn on. Have you encountered this situation? Your needn't worry about it,here is the repair guide.Let's have a look! First of all, we need to connect it to DC power supply  with iPhone lightning cable to test the iPhone charging current, the current jumps around 200mA, not stable.we found the computer can't identify the iPhone when it is connected, and it doesn't boot. second , we need to disassemble iPhone to detect. with the help of the phone opening tools to tear down the iPhone, and then remove the iPhone motherboard. Measure the iPhone motherboard with Fluke 15B+ Digital Multimeter , there is no current, which means no leakage. Trigger it and it shows large current, the current up to 1.9A. Now, apply some rosin on iPhone logic board, and then use QUICK 861DW hot air rework station to heat it, it's turning white.As shown in picture. It's frustrating to see this, did the iPhone main power b

“No service”message appeared on the iPhone screen, thus we are not able to operate our mobile  phone. In this critical situation, all basic functions could not be realized, including calls or messages. Sometimes, our iPhone 6S Plus will not show any service after the SIM card plug in. How to solve it? Basic on to our previous experience, if mobile phone shows no service after plugging in SIM card, there are generally two  damaged parts as follows. Part 1. Signal channel part Part 2. REFF bus You have to distinguish them when testing cell phone. Plug SIM card in, we can see the serial number when dial *#06# on dialing interface, as shown in picture, it seems that it is not the problem of the REFF bus, so we can exclude the fault caused by the bus (if the bus caused the fault, it will not show the serial number on the iPhone 6s Plus screen after dialing the *#06#). From the picture , we can see the operator option on the interface, there seems to be no problem with th

Although iPhone6s water resistance is very strong, it is not a waterproof phone after all. If you dropped your iPhone in water - be it the bath, sink or long-drop toilets? It may cause a touch screen malfunction. How to repair the iPhone 6S has no touch function after getting into water. With this guide you can repair your iPhone 6s easily. 1. Disassemble the cell phone with professional iPhone 6s opening tools .With the magnifying glass, we can see that the traces of water have been processed by the last repairman. 2. Using Fluke digital multimeter  to measure the grounding resistance of display touch socket, we found that  the 30th pin(PP5V1_TOUCH_VDDH_CONN) power supply to the ground is short circuited, the multimeter value is shown in picture. 3. Based on our previous repair experience, we try to remove the +5.1V filter capacitor (C4003) of the display power to get rid of the fault. 4. Use digital multimeter to measure again, we found that there was no any short

iPhone X is one of apple's most exciting new versions. The new futuristic phone is compact and full of amazing features, but the iPhone also has many problems, such as failed charging. As we all know, the problem of cell phone charging is a very important part of our daily work.It is useless for us if the mobile phone cannot be charged. How to repair the iPhone X not charging.The repair process is as follows. Before we start to repair, we can check the charging principle of iPhone X on ZXW Dongle . Plug iPhone data cable, the iPhone tail plug connector J6400 47/48 pin gets 5V input voltage PP_VBUS1_E75, at the same time, the 20 pin HYDRA_CON_DETECT_CONN_L will be pull down. AS shown in picture. 5V of PP_VBUS1_E75 send to U3300, after R3360 output PP_VBUS1_E75_RVP, finally sent to U6300. HYDRA_CON_DETECT_CONN_L is renamed HYDRA_CON_DETECT_L by R6410. HYDRA_CON_DETECT_L send to the multifunctional electronic switch tube U6300 G3 pin, when the U6300 received a low p

iTunes is a great option when you upgrade to the latest iOS. However, sometimes you run into errors such as iTunes error 14 during your upgrade or a restore. Some iPhone 6S Plus users reflect the problem that there is no serial number when the iPhone is flashing with iTunes, and the iTunes reports an unknown error 14, 4013, etc. According to the past experience, we suspect that it's an iPhone Nand flash  problem. This is fortunately easily solved with few steps! We have a couple of solutions for you. Connect iPhone 6S Plus to computer with lightning cable, use iTunes to flash iPhone 6S Plus, the iTunes reports that the iPhone "iPhone" could not be restored. An unknown error occurred (14). First, disassemble the iPhone, take out the iPhone motherboard, and then carefully remove the iPhone Nand flash. Check iPhone bitmap on  ZXW Dongle  , and then measure the diode data with multimeter, we found that the resistance value of iPhone Nand flash solder pad M6 Pin is i

More and more users are claiming that their iPhone 6 won't open in some cases. If you can't turn on your iPhone 6, and you don't  know what to do? Here is a comprehensive guide for your reference. The iPhone 6 turn on with white Apple logo,the mobile phone screen was replaced once after dropping. Based on our past repair experience,we know that the dropped device should be directly checked on its CPU parts.First,check the bus and reset, both of them are normal. Cut the shiled cover above the fingerprint, use Fluke 15B+ digital multimeter  to measure the resistance of CPU to the clock and data. The normal values of R0317 and R0316 are more than 400, the measurement of R0317 resistance is 745, and the R0316 is 479. This case is mostly the two pin of AP31 and AR31 in the right lower right corner of CPU has pseudo soldering. First press the iPhone 6 CPU  to test whether the device can turn on or not, do not try to reflash the phone first, it will report error 9. Of cours

If your iPhone 7 is having problems with a dim screen, it’s almost certain that the fault is related to the backlight. Such as the  iPhone touch screen  no display, the screen light is very dim or cannot adjust brightness and so on. Fortunately, these "screen dim" backlighting problems can be fixed. Just follow these steps can fix the iPhone 7 backlight. First of all, please connect  ZXW Dongle  to your computer, and then open it to check iPhone 7 backlight power supply schematic diagram. According to the iPhone schematic diagram, we know that the  iPhone backlight boost IC  output three sets of backlight power supply signals, they were PP_LCM_BLANODE (16.5V Cathode Voltage), PP_LCM_BL_CAT1 and PP_LCM_BL_CAT2, these three circuit signals are sent to the display interface via three inductors respectively.As shown in Picture. These three inductors are vulnerable to damage, and then lead the iPhone has no backlight or unstable light, sometimes bright,

Fingerprint recognition, a trend intelligence applications, since the iPhone, fingerprint identification has been known to everyone step by step,After all, it's easy to use fingerprint unlocking, Compared to other ways, fingerprint to unlock speed faster, and more convenient. But recently many people have found that iPhone6SP fingerprinting has become a bit ineffective and very insensitive. What is going on? How to solve it? In this article I will share how to solve the problem of fingerprint unlock failure. First, let's connect the ZXW Dongle  to the computer to see the schematic of the fingerprint flex cable interface. As shown in Figure Look at the iPhone 6S plus's flexible cable interface, we can find that it is a little different from the iPhone6 plus. The left side is the control signal of the fingerprint part. The right side of the MAMBA is the function of the new Force Touch, it's called the piezoelectric Touch, for example, gently to desktop cloc

It can be a frightening experience when you try to turn on your iPhone and nothing happens.   Your i Phone SE will not turn on and you’re looking for help. It ’ s a problem that can be easy or difficult to fix, depending on the cause. In this article, I will help you to fix your iPhone when it isn ’ t turning on. I met the same situation, a customer sent us an iPhone SE ,the fault is described that the phone won ’ t turn on, it also has leakage when supplying power. We are going to repair it. Opening the iPhone SE and remove motherboard to have a test, the battery interface is the same as iPhone 6P, if there is no professional  6P DC power supply  interface, it can also be an ordinary alligator clip, as shown in picture. The battery positive voltage VBATT is first sent to the charging IC-U2300, and the charging IC-U2300 outputs the main power supply VCC_MAIN (same as the battery positive voltage value) to the main power supply U2000 and other related circuits.

Sometimes, even if you plug in the power, the iPhone or iPad will not charge the battery. You may find that the device beeps and tells you that it is charging, but the power level never increases; no electricity enters the phone and requires constant fiddling and balancing; the lightning cable is loose and the correct connection cannot be maintained. In this article, we will outline what you can do to repair an iPhone that cannot be recharged. A customer send us an iphone 6 ,description of the problem is that there are charging icon on the screen, but there is no electricity into the phone, and keeps restarting. After receiving it, we found that the motherboard charging chip, battery and accessories have been replaced. steps 1. Use a Fluke digital multimeter  to measure (C1408, C1700) USB to U1401 charging tube and U1700 (U2) voltage, both 5V are normal 2. Remove the U2 and the charge tube respectively and measure the voltage at the bottom to see if the iPhone 6 mot