Best tutorial repair iPhone 6S stuck on White Apple After booting

The iPhone 6S fell into water, and then it stuck on white Apple logo after booting, and can't continue past it to the home screen, you may think your iPhone is ruined. That's not necessarily the case. Here are a number of steps you can take to get your iPhone out of a startup loop.

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.

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