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Solved: iPhone 7 Plus keeps reboot after white Apple logo appears

Colleagues have sent us an iPhone 7 Plus to repair, the fault is that when the iPhone is turned on, it will stuck on white Apple logo and then automatically rebooted, and the iPhone is hot. After we receive the iPhone, connect it to DC power supply, the current is very large. Colleagues previously suspected that it was a CPU problem, so we're going to flash the iPhone and look at the specific error code; we found the top of the iPhone very hot. The iPhone repeatedly reboot, CPU part hot is normal, but the top of iPhone hot is abnormal. The top of iPhone 7 Plus is line and WIFI, so we are targeting the WiFi.


Quickly remove the iPhone motherboard and touch the iPhone WIFI IC, it's really hot, now we can confirm that there's something wrong with WiFi, and this serious hot is mostly caused by a short circuit in the capacitor. We can replace the WIFI IC, but the WIFI IC is close to the CPU in the iPhone 7 series, and after replace the WIFI IC, we still need remove iPhone NAND flash to unlock WIFI, it is not only troublesome, but risky, so we chose an easy and risk-free method--scrape WIFI with S1018 CPU Remover.

Because it was the first time we scraped the iPhone 7 WIFI, we don't know the specific location of those tiny components, so we put it under the Trinocular Stereo Microscope and scraped the entire WiFi module off. The marked position is short circuit, as shown in picture 11-4-1. Just pull it off, and use the Fluke 15B+ Digital Multimeter to measure it, now the data shows more than 300, it is normal.


Assemble the iPhone, there is no white Apple reboot phenomenon after booting, and WIFI also is normal. But, now the half iPhone LCD Display is dark and the other half is bright, as shown in picture 11-4-2. Fortunately, this problem is easy to solve.



Open the WUXINJI SchematicDiagram and check the iPhone, we found that this was caused by an damaged inductance FL3902, as shown in picture 11-4-4. Just get rid of it, and then use QUICK 861DW rework station to weld the jump wire on it. Finally, everything is fine after the boot.


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