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Best method for repair iPhone 6S WIFI

Today, we are going to repair iPhone 6S WIFI issue.

The tricky thing about repairing iPhone 6S WIFI is that you have to use PCIE nand test fixture to re-write the WIFI address after the replacement of iPhone 6S WIFI module. Some iPhone WIFI still can be used, but there is a very serious leakage and heat phenomenon, this case can be fixed.


The repair case as follows

After the iPhone 6S boot for a while, it’s overheating, and then the iPhone suggests the temperature is too high.

Disassemble the iPhone by phone opening tools, remove the iPhone motherboard, and then connect it to DC power supply to test, after booting for a while（about 10 seconds still not enter the IOS）, it shows large current and power down.

According to the above phenomenon, we suspect that it may be a problem of WIFI（because the current is normal when you start the boot）.

The boot process of iPhone: press the iPhone power button-- power IC supply power to iPhone CPU/ iPhone Nand flash/ display IC/ light control IC/ touch IC--CPU start to read the software of Nand flash-- start the WiFi part in 10 seconds-- start the baseband section in 20 seconds to work. Based on this boot process, we're judging that iPhone WiFi module is damaged. Because this iPhone 6S can be turned on with iPhone battery and WIFI can be open after booting, it just overheat caused by large current, and then the iPhone temperature is too high.

Use rosin method to make WIFI turn white, and then boot it to test, after a while, the iPhone is seriously overheated. Disassemble iPhone motherboard, observe the WIFI module under the 7-45X Trinocular Stereo Microscope, it's obviously discolored, which means the WIFI module is short circuit.

Carefully shovel the shell of the WiFi module, measure the diode data of all capacitors with Fluke 15B+ DigitalMultimeter, we find a capacitor is short circuit to grounding. Because there are other components connect with this capacitor, in order to find the specific short circuit point, we need apply some rosin to turn the parts in the WiFi module white, and the add voltage on the point of short circuit, after a while, you will see the short circuit parts discoloration.


After confirm the specific short circuit point, we can use BGA graver knife to scrape it, after remove this IC, the iPhone 6S can be used normally.

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