How to fix iPhone 6S stuck on White Apple After booting

The iPhone 6S fell into water,and your iPhone is stuck on the Apple logo during startup and can't continue past it to the home screen,It was repaired once before, when we received it, the iPhone 6S in white Apple status and it will be restarted occasionally. After remove the iPhone logic board, we found that the iPhone U2 IC and charge tube has been replaced.Here are a number of steps you can take to get your iPhone out of leave White Apple.

Check the iPhone logic board under a 3.5X-90X Stereo Zoom Microscope 14MP HDMI Camera, there are small beads around the chip, which is a serious mistake. Clean up the iPhone logic board and then replace the new U2 IC and charge tube, but the problem still the same, iPhone stuck on white Apple logo and restart occasionally.

Use Fluke 15B+ Digital Multimeter to measure the diode data for iPhone battery detective pin, the data is normal, the resistance of iPhone booting condition is normal, and the voltage also is normal.

For the watered-iPhone, iPhone system is less damaged. After consulting with the customer, we start to flash iPhone. Connect iPhone to computer with iPhone lightning cable, the computer pop-up prompts that USB is not recognized. We suspect that the problem will be in the U2 circuit line. Take off the U2 to measure the resistance value.

Picture 17-6-1

After measurement, the U2 IC F4 pin PP3.0V_TRISTAR is short circuit, this point is connected to power and an inductor FL5408_RF next to an iPhone WIFI module IC, the U5411_RF receive amplifier is connected to the head of iPhone logic board. In order to find the problem point correctly, first we remove the FL5408_RF, measuring the ends of the inductor, we found a short circuit at the end of the amplifier.

Picture 17-6-2

Remove the two capacitors on the bottom, the problem still there. Remove the U5411 IC, and then measure it, the data is normal. The glue around this chip is very soft，use QUICK 861DW hot air rework station in 150 degree to remove it is enough, and please don't remove the capacitor next to it.

Picture 17-6-3

Finally, install the IC, re-weld the FL5408_RF, test iPhone and it can be turned on properly.

if you want to reading the more free repair guide, please follow this link:https://www.vipprogrammer.com//news&zenid=jflu64vu16ohukeil0nh8861p1

Comments

Post a Comment

Popular posts from this blog

Slove iPhone X Won't Turn On

Image
Customer delivered a iPhone X and described the fault is not to boot after the phone drop accidentally. It reports error 56 when restore the iPhone X. How to repair this fault? Because iPhone X is the two board connected through the middle column, it is easy to drop the point. It may be that the solder points from NFC chip to the CPU part have fell off. Take apart the iPhone X by iPhone Screwdriver Repair Tools , take the upper board off the main board, when separate the main board we see a row of points have fell off. Picture 19-3-1 Look at 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. Picture 19-3-2 Then the tin of the middle column is repaired by iPhone X BGA reballing stencil , and the AP part is welded bac
Read more

Setup and install the zxw tool Dongle Wizard

Image
So, you recently purchased ZXW Tools from our vipprog online store have no clue how to set it up?  Well, here is a quick guide detailing the installation process. Step 1 Unbox the ZXW tools dongle and plug it into your Windows PC.  ZXW tools does not support Mac at this time, so you’ll need a Windows compatible box. Step 2 Download the ZXW Tools software [direct link].  The ZXW tools website is in Chinese, but lucky for you, we’ve made it easy for you to download the latest version of their software directly from our website.  The zip file contains all of the files necessary to run ZXW Tools (trace) and Blackfish (schematics).  There is no installation process.  You just need to copy the files over to a directory on your desktop. Step 3 After you’ve copied all of the files over to a folder on  your desktop, then just run the ZXW tools executable.as shown in the picture. When your first run the software, the program will ask you if you want to activate the dong
Read more

IPhone 6P Front Camera and Distance Sensor Fault

Image
Received a iPhone 6 Plus, the customer said that the front camera can not be used, and the distance sensor has problem too. The two failures are concentrated on the front camera flex cable, which is likely to be caused by the damage of the wiring. First, we have to eliminate the possibility of the external parts fault, then consider the motherboard problem. Remove the screen assembly and replace it with a good one, we still can't turn on the front camera and use the distance sensor. Disassemble to measure the ground resistance of the front camera seat of J1111 by Fluke digital multimeter , it is found that several pins are infinitely large, and the related inductors are loose when touch with the pen. It seems that the small components are pseudo welded. 19-1- 1 Remove the motherboard and observe it under the Trinocular Stereo Microscope , we can see that the touch was repaired before. 19-1-2 The back of the sub touch chip U2402 is the front camera seat J1111, an
Read more