Professional cellphone repair guide and high quality cellphone repair tools

If the iPhone's touch screen fails, then this iPhone is useless to us. If you encounter an iPhone touch failure, what should we do? Buy a new one or fix it? If you don't have enough money to buy a new iPhone. We recommend fixing it. We received a touch-failed iPhone 6 Plus, the following are the repair steps. You can refer to it. It can be turned on when we receive it, but the iPhone touch function is not available, so we can't test other features. After the iPhone touch screen is replaced, the problem still exists. Remove the iPhone motherboard for testing. The bottom of the UMT board is easy to disconnect, first we need to handle the iPhone touch error. There are 2 ways to remove the IC: one is remove it by tweezers; the other one is pry it from the side the IC. Remove the iPhone touch IC and the re-install it, the iPhone 6 Plus auto restarts when the white Apple appears. Measure the iPhone by DC power supply , the boot current jumps from 300mA. Take off t...

How to fix iPhone iPhone X White Apple? This is an annoying problem. Our customer sent us a 64G iPhoneX that needs repair. The error described is that the white Apple logo is repeatedly opened and restarted, and his iPhone is damaged by water. After getting the phone, it can display the white apple logo after startup and restart after a few seconds. Due to the impact of the 7th generation baseband issue last year. The first reaction you will have is the baseband problem, then we choose to brush. Don't worry, first, we disassemble our iphone by using iphone graver tool and connect the adjustable power supply to observe the current, and the current jumps normally. When the current jumps above 1A, it will ceaselessly restart with a black screen after two jumps. In this case, the possibility of the iphone baseband CPU is ruled out. When the current is up to 1A, in addition to the baseband search signal, and the WiFi and the external configuration are also the system detection pr...

What should I do if I encounter an iPhone white apple failure? Our customer sent an iPhone 7P, the fault described is that the iPhone fell into the trash, it can be used normally on the first day, after a day, the iPhone always restarts at startup and it does not enter the IOS system. Now, the customer sends the iPhone 7P to us for repair. The iPhone's failure is the same as the customer's description. The iPhone is refreshed and iTunes reports an unknown error of 9 (the progress bar only flashes once and then reports an error). For iPhone 6S and later, the unknown error 9 usually is caused by iPhone Nand flash and iPhone logic epprom IC. Measuring the power supply of the iPhone Nand flash by digital multimeter , the 3V, 1.8V and 0.9V all are normal, and the iPhone Nand flash and iPhone logic epprom IC didn't been repaired, but the iPhone baseband part did. Leave it alone, now we try to fix it by replacing iPhone Nand flash , after replacement, it still reports unkno...

Have you ever encountered a situation where your phone can't be activated? How did you solve it? We received an iPhone 6Plus and the iPhone 6S Plus could not be activated. The following is our solution. After receiving the phone, there was no response after plugging in the charger. Then, using the Phone Opening Tool to disassemble and connect it to the adjustable power supply, the iphone 1505TA 15V 5A DC power supply is a good choice. Just found that the motherboard's large current is not turned on. However, after two seconds, the phone miraculously does not short circuit. Maybe the current is too large and the damaged parts will be burned. After launching, we found that the screen of the phone was half black and half bright. After testing the J4200, it displays seat pin 5 PP_LCM_BL34_ANODE_CONN backlight anode short circuit, tear off the black leather, and found that the light D4050 diode has burned and ruptured, the resistance of the diode at both ends is 941 afte...

What if the iPhone 6 Plus has no sound? This will bring a lot of inconvenience to our daily use. For example, the iPhone 6 Plus's speakers have no sound, and the headphone mode is displayed when the voice is played. The IOS system always ensures access to the headset. How can we solve it? The iPhone J1817 headset is plugged into the detection signal HPHONE_TO_CODEC_DET_CONN. This phenomenon is usually caused by the iPhone's tail-plug flexible cable and iPhone audio IC. Use the phone open tool to remove the iPhone, disconnect the iPhone tail plug cable , and now check the iPhone to see if the iPhone is in headset mode. It has been observed that the iPhone 6 Plus is still in headset mode, and when the iPhone's tail-plug flexible cable is disconnected, it does not seem to be a problem with the iPhone's tail-plug flexible cable. Take out the iPhone motherboard to check iPhone audio IC. Use QUICK 861DW hot air rework station to heat the iPhone audio IC U0900, and...

The customer sent us an iPhone, and the customer said that the device automatically entered DFU mode and could not boot. How to repair it? What tools we need? please read the following steps. Disassembling the power supply and power on to 100mA by iphone graver tool . First, check whether it can be connected, it reads DFU mode after connecting the computer. Wireless DFU can not exit, we can do nothing but brush the machine to see the error Brushing with Aisi and iTunes respectively, after stuck on the progress bar for a long time, the error is -1. If the progress bar does not go, you can roughly judge the probability of the CPU failure. Now we do something to the hard disk. First, test the power supply by DC power supply for iphone repair, the hard disk on the left side of the capacitor can be tested to 0.9V, 1.8V, 3.0V, the power supply is normal. Delete the hard drive you want to test. First, it is normal to reach the resistance value. Test the hard disk using the iphone ...

We received an iPad 4, the fault description is that after the iPad LCD screen is replaced, after the iPad owner repairs the iPad motherboard, the iPad cannot be turned on. According to the description of the iPad user, we know that the iPad display has been replaced, and because the iPad does not turn off the power when the screen is replaced, it makes the iPad LCD screen half bright and half black. The iPad user then tried to fix it by repairing the iPad motherboard , but it failed and damaged the capacitor, so the iPad will no longer open. First connect iPad to the DC power supply to check the current, we found the iPad is short circuit 3A. Remove the iPad motherboard to observe, we found the inductor L2210 and L2200 and the one side of an inductor is connected by tin. Clean it up, and then measure is again, now the iPad is not short circuit. Check iPad schematic diagram through by WUXINJI Dongle , we found these 2 inductors are backlight fuse inductor. We can sh...

One of my clients asked me for help. He bought a second-hand iPhone, but used it to find that his phone had no sound. When you turn on the ringtone option on your phone, it gets stuck. Turn on the recorder and click on the recording item, but you cannot record any sound. What caused this failure? What measures should we take? Facing up to the case, the possibility of a small audio failure is greater. Romoving the iphone motherboard , we obeserved that  the large audio and the small audio have been replaced. As the case revealed, the culprit possibility of the chip itself is very small. Removing the small audio by iphone opening tool , and testing the small pad ground value of the pad, finding that the small audio F6 foot resistance is infinite (normally around 400) This is the small audio I2S bus, to the big audio and CPU. If refer to the big audio, removing the big audio, if it cannot work, you can consider to change the big audio ic , test the pin connected with ...

Our customer sent us an iPhone 6, which is often unserviced and displays search signals on the iPhone display. When the iPhone is in an unserviced state, there is no IMEI after dialing *#06#. How to repair it? According to our repair experience, this iPhone has no service error and is usually caused by the RFFE1 and RFFE2 buses of the iPhone baseband . Check iPhone schematic diagram though by WUXINJI Dongle , these 2 sets of buses are the various ICs that the baseband CPU uses to manage the signal parts. For the dropped damaged iPhone, generally the circuit of the RFEE1_DATA to U1 pin is disconnected. Use phone opening tools to disassemble the iPhone, take out the iPhone motherboard. Use QUICK 861DW hot air rework station to heat the iPhone baseband, and then use tweezers to remove it, and then soldering the jumper wire from U1 pin to the test point of the back side. Apply some green UV oil, Use the Ultraviolet Light Lamp to solidify it, and then install iPhone baseban...

We received an iPhone 5 and the customer said that his iPhone 5 charging was faulty. The customer cannot charge. This question is very annoying. How can we fix it? The charging part of the iPhone 5 consists of Q2, U2 and U7. The circuit diagram of charging port J7 can be queried on the WUXINJI dongle . As shown in picture. 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 pin in the middle of the battery contact J6! they pass through FL10, FL11 respectively and send to power IC-U7, FL10, FL11, in actual cell phone repair, it is found that the 2 pins are very easy to fall off, causing the cell phone can not be charged! and keep reboot again and again! If there is a problem of charging, plug in the data cable, use Fluke digital multimeter to measure whether C304 has 5V output, and measure whether C272 has 5V output. If not, you need to ...

We received an iPhone 6 and the customer said that it was unable to switch WiFi. After the cable was disconnected, the iPhone 6 Plus WIFI switch could not be turned on, which means that the iPhone WIFI function could not be used. How can we fix it? Start the iPhone 6 Plus, enter the IOS test iPhone, all functions are running well, except the iPhone WIFI, the iPhone WIFI icon can not be opened. First, use phone opening tools to disassemble the iPhone 6 Plus, remove the iPhone display assembly, disconnect the iPhone battery, and then take out the iPhone motherboard. Put iPhone motherboard under the Stereo Zoom Microscope to observe, we found the iPhone WIFI IC has some problem. Use QUICK 861DW hot air rework station to heat the iPhone WIFI IC, and then use tweezers to remove the iPhone WIFI IC, there are 18 pieces pin are missing, one of them is an empty pin, no need to fill. Clean up the solder pad, and then use fill the missing pins, apply some green UV oil to those pin...

Have you ever encountered a short circuit in your phone? Our customer delivered an iPhone SE to us. The fault described is a short circuit in the phone and cannot be restarted. How to solve it? First, we took off the motherboard and felt 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 the Fluke multimeter to see if there is a short circuit in the battery or the main supply. It is found that there is a short circuit in the main power supply connecting component by value evaluation. Rosin some rosin on the main power supply connecting component again. The C2331 melts instantly when the single circuit is energized. It seems that the fault point is here, so we rem...

We received an iPhone 6S, the problem is that the iPhone 6S LCD screen is not displayed after booting. Due to other issues, this iPhone 6S has been fixed once and now we need to fix it again. First of all, what should we do? Use the phone open tool to remove the iPhone 6S, then use the DPS DC power to start the iPhone, the iPhone can be opened smoothly. Install the iPhone battery, assemble the iPhone, press the iPhone power button to turn on iPhone through by iPhone battery, the iPhone is turned on, but the iPhone LCD screen doesn't display. Considering the voltage of iPhone batter is 3.6V to 4.3V, so we adjust the DPS DC power supply to the lowest value 3.6V, the result tested is that the iPhone doesn't display after booting. According to our repair experience, in this case, the iPhone no display problem is caused by the low display boost. Check iPhone schematic diagram through by WUXINJI Dongle , based on iPhone 6S schematic diagram, we know that the iPhone di...

We will encounter various error codes when using the iPhone. This is a very common problem. Do you know how to fix the error 56 on iPhone 7P? We received an iPhone 7P that displays the iTunes icon. When connected to a computer for recovery, it reports an 80% error 56 with the same error code as the previous model, usually caused by camera power and NFC. There is no abnormality in the resistance value of the power supply of each circuit of the camera. Check the NFC section, there is a common fault in the iPhone 7P. The NFC power supply tube in the upper left corner of the CPU can be connected short first. Short the A1 and A2 pins on the NFC power supply tube and short-circuit to resume the test. Since then the iPhone 7P still can not pass, so we can only test through NFC. It is no problem to test the resistance of the socket by Fluke digital multimeter , reball the NFC module with iPhone BGA reballing stencil , install the NFC module and restore the phone after installa...

Our customer sent us an iPhone 6 Plus. This iPhone 6 Plus can open the WIFI icon, but the WIFI signal is very bad. If the iPhone is a little far from the router, it has no signal at all. How to solve this iPhone WIFI problem? The following is the solution, you can refer to it. First, open the iPhone and test it. Open the WIFI icon to search for the WIFI address, the WIFI address that can be searched is very small, and the signal is very poor, but the iPhone with good conditions can search for multiple WIFI addresses, which means that the iPhone 6 Plus is abnormal. Use phone opening tools to disassemble the iPhone, first we need to check the iPhone WIFI IC. In order to test whether the iPhone WIFI IC works normally, we can solder a jumper wire to replace the antenna circuit on the periphery of iPhone WIFI chip. Check iPhone schematic diagram via WUXINJI Dongle , we can solder a jumper wire as the antenna from C5213_FR than next to WIFI. After soldering the jumper wire,...

We received an iphone 6S that could not be started. First, use the iPhone Opener to remove the power box and power it to 100mA to check if it can be connected. We connect it to the computer and display the DFU mode. Unlimited DFU cannot exit. In response to this situation, we can only brush the machine for error. Brushing with Aisi and iTunes respectively, both will stick on the progress bar here for a long time reporting  -1. The progress bar does not go, you can roughly judge the probability of the CPU failure, and then, we  decided to test the hard disk. First, measuring the power supply, the vertical capacitance of the left side on the hard disk can be measured to 0.9V, 1.8V, 3.0V, and the phone power supply is normal. Removing the hard disk to test, first hit the resistance value, and the resistance value is normal. Test the hard disk on the test stand, this 6S original hard disk is damaged, can't read the data and can only be replaced. First, query the se...

We received the iPhone 6 Plus , this iPhone 6 Plus has no recording function, and the music ringtones played are normal. It has previously replaced the iPhone tail cable . As far as we know, the recorded MIC circuit is most directly controlled by the iPhone's large audio IC. With this in mind, we started to fix it. Disassemble the iPhone 6 Plus, we find the R0301 resistor that next to the iPhone big audio IC is missing, replace the new iPhone big audio IC , and solder the R0301 resistor. The R0301 resistor is missing, and this resistor is on the I2SO but clock signal between the iPhone audio and CPU, so we think we can fix it by soldering the resistor and replacing the iPhone big audio IC. Turn on the iPhone 6 Plus, open the voice memos to test the recording function, but it's still not working. Analysis and observe it, we find that there is the trace of the welding on the shield cover of the iPhone baseband, which means the colleague has repaired the iPhone base...