跳至主要内容

Guide: iPhone 7 Charging Failure Repair

We are going to repair a iPhone 7 with charging failure, first of all, we need to know the working principle of charging part. The 5V charging voltage PP5V0_USB sent by the charging interface is sent to the charging IC, then it is sent to the charging protection tube and sent to USB control IC.


The charging protection tube is easy to damage, resulting in only available for charging while turning off the iPhone 7. It won't charge after turning on, prompting "do not support this accessory".

The iPhone 7 USB control IC damage will cause charging and online failure, prompting unrecognized USB and no support for this accessory, it may also cause a failure to stuck on white Apple logo while turning on the iPhone.

How do we repair the charging fault? it can be solved by the short connection, we can check the iPhone 7 charging part schematic diagram by WUXINJI dongle as shown in picture 1-1, the detailed repair steps are as following:


1.Plug in data cable and use Fluke 15B+ Digital Multimeter to measure whether the PP5V0_USB of point A has a 5V.

If not, check and replace the iPhone 7 charging port flex cable.
If there is 5V, continue to see if there is 5V at the point B.

2. As shown in picure 1-2, continue to measure the 5V voltage with multimeter.


If not, it indicates that the charging protection tube is damaged, which can be short connected as shown in the picture.

3. If both point A and point B have 5V, replace the charger IC and USB control IC.

If you need more professional cell phone repair tutorials, please research on www.vipfixphone.com

评论

此博客中的热门博文

iPhone 6 Display Failure after Replacing LCD

The iPhone 6 display is black after replacing LCD. After checking, the diode data of display socket is normal and all power supply for iPhone display IC  output is normal. Testing by  DC power supply , we find the iPhone current is abnormal. When press the iPhone power button, the boot current is obviously large. The current reached 100mA when press the power button. After remove the display tube, the current still the same, which means there is a short circuit. Measure the voltage output of each circuit of power supply with Fluke 15B+ Digital Multimeter , then surprised to find that there are really short circuit places. LD010 is short circuit; we suspect that the filter capacitance on the circuit has been penetrated. After remove the iPhone power control IC , we found it is ground short circuit. Open the WUXINJI Dongle  to check the iPhone schematic circuit, we found that this circuit is the display card image transmission MIPI data bus power supply. CPU brea...

Solution: iPhone X Won't Turn On

According to the customer's description, the iPhone X would not turn on after it drop accidentally. Then the cell phone reports error 56 when restore it. How did this happen? Let's test and repair step by step. Since iPhone X motherboard 2 layers are connected through the middle column, the solder points are very easy to get dropped. so we guess that the solder points from NFC chip to the CPU part have fell off. Disassemble the iPhone X by iPhone opening tools , remove the upper board off the main board, when separate the main board we see there is a row of points have fell off. Check the location map on WUXINJI dongle , it is surrounded by a ground wire, in fact, there are 6 useful points dropped. The ground wire does not need to be filled, the 6 useful points are added by professional phone welding tools. These are the signal wires of the NFC chip, so the iPhone X would report error 56. Then the tin of the middle column is repaired by iPhone X BGA reballing ste...

Guide: iPhone 7 Plus Camera Fault Repair

iPhone camera failure is common for most of cell phone repair technicians, today, we're going to fix iPhone 7 Plus camera. According to the holder's description, the front small camera is normal while the rear camera fails to take photos, when turn on it, the iPhone 7 shows black screen. Let's start from easy repair operation: directly replace the iPhone camera to have a test.  Note: Pay attention that two camera are connected together. When disassemble the iPhone 7P rear camera , you need to pry up from the left side.  The fault is same as before after replacing a new rear camera. We tested before, the iPhone 7P double camera is rely on the bigger camera to get image, as shown in 15-5-1, the corresponding part on iPhone 7P motherboard is J4501 pin, the resistance value is normal after testing with Fluke 15B+ digital multimeter , it reminds of us that iPhone6 Plus also encountered this phenomenon, the power supply part has some problem. By checking on  WUXINJ...