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Showing posts from April, 2018

Best FIX iPhone 6 iTunes error 56 failure

The customer failed to update iPhone 6 IOS by WIFI network at home. When we received the iPhone; it is in iTunes data cable mode. We need flash it again by iTunes, when the flash progress bar reaches 80%, iTunes reports unknown error 56 (the failure has camera power supply circuit and NFC). In order to fix iPhone more efficiency, it's necessary to measure the iPhone camera  circuit; The result is that the camera circuit is normal. We can ignore the issue of iPhone baseband CPU , if iTunes reports unknown error -1, and then we need to repair iPhone baseband CPU part. But this iPhone can be used normally before flashing, so we suspect the NFC module is damaged; now we decided to remove the U5301_RF first. Remove U5301_RF by QUICK861DW  hot air rework station, and the measure the diode data for bottom pin circuit by multimeter, after measurement, we found it is short circuit. Open the WUIXNJI Dongle  to check iPhone schematic diagram, we know that this circu...

iPhone 6 failed to flash -- what to do?

When flash  iPhone 6 as before, it is failed. what to do? Brush iPhone 6 again, insert iPhone USB lightning cable and then directly inter the DFU mode. Use iTunes to flash iPhone till it runs on 20%, it reports  FORTrueData file error.  According our repair experience, we suspect that it is caused by iPhone logic eeprom IC or iPhone Nand flash . Put iPhone on the WL  Aluminum Alloy Pad, and then use phone opening tools to disassemble the iPhone 6, carefully take off the iPhone motherboard, and put it under the microscope, we found the iPhone Nand flash was previously repaired. Use QUICK 861DW hot air rework station to remove the iPhone Nand flash, finding that t here are much copper dropped out from the Nand flash. We need to replace the new Nand flash. Take a iPhone Nand flash, and then use JC pro 1000s iPhone chip programmer to  write the original underlying data on new iPhone nand flash. Now, we weld the new iPhone nand flash to i...

Solved: iPhone 6S Plus compass unable to use

We got the problem for iPhone 6S Plus, the iPhone 6S Plus compass unable to use, moreover, the iPhone display screen cannot be  normally switched over, we need to solve it. Put iPhone on the  WL Aluminum Alloy Pad , disassemble the iPhone by phone opening tools, and then remove the iPhone motherboard. Because the iPhone compass function is abnormal and the  the screen flip can not be used, t his kind of fault is generally caused by damaged gyroscope chip or the chips on the connected SPI bus. As shown in picture 15-10-1 . If the iPhone 6s Plus screen  flip is abnormal, it will affect the function of the compass. So, now we replace the  gyroscope chip first, and then test it again, the problem still exists.  Remove the iPhone motherboard, and observe it under the Phone Repair 7-45X Trinocular Stereo Microscope , we found  that there is corrosion trace around the iPhone 6s Plus compass chip. Directly remove the iPhone compass IC, fi...

Troubleshooting Guide: iPhone 6 won't display during normal use

One customer sent an iPhone 6 need to repair; the described fault is that the iPhone 6 touch screens suddenly no display during the normal use. We need to fix it. First, we need to check iPhone 6 schematic diagram on WUXINJI Dongle , and then we know the iPhone 6 display socket circuit diagram. Next, use Fluke 15B+ Digital Multimeter  to measure the diode data of iPhone display touch socket, finding the 26 pin circuit is shorted; The display screen is positive 5.7V. According to iPhone schematic diagram, we know that this circuit is output by iPhone displaytouch IC , there are 6 filter capacitors on this circuit line. Based on previous repair experience, we judged that the filter capacitors are damaged. Put iPhone motherboard under the Phone Repair 7-45X Trinocular Stereo Microscopo , and then remove the filter capacitors one by one, when breaking into the third filter capacitor, the data measured is normal. Install the iPhone, and then press iPhon...

Solution for iPhone 7 Plus: no camera ,no charge, no sound

After iPhone 7 Plus dropped, the iPhone can't take photos, no sound on the headset and no charge after dropped. Repair Process After received the iPhone 7 Plus, it seems to have a lot of issues, but we need to examine it progressively. First we need to solve iPhone charging issues. When use charging cable to charge iPhone 7 Plus, it really on no charge status. Connect iPhone to computer, finding that the computer can't identify the iPhone. Based on these phenomena, we can basically confirm that it is caused by iPhone USB control IC . Disassemble the iPhone USB control IC from iPhone motherboard, and then measure the diode data of iPhone solder joints on solder pad with Fluke 15B+ Digital Multimeter, finding that the diode data of iPhone USB IC C3 pin is infinitely large. This signal point is connected to iPhone main audio IC by through resistor R3104. There are three reasons can cause this case, one is resistor R3104 is damaged; the second one is the iPhone motherboa...