The Boom iPhone 12 Issue Repair

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iPhone 12 issue repair, a small issue caused the more serious issue, it’s just like a headache boom for the repair technician.

Defect Phenomenon

After the drop damage, the flash function stop working.

Send to a repair shop to fix, the previous repair technician first replaced another flash flex cable to test, the issue still remains unresolved. Then preliminary judge it’s the motherboard problem, so tried to desolder and separate the two layers of the motherboard to test. After separation find both the Baseband and Wi-Fi function were failed.

01 find the Baseband and Wi Fi function failed

Troubleshooting

Received the phone with the motherboard separated.

02 Motherboard is separated

Is it possible the issues are caused by the poor connection of the two layers of the motherboard?

Let’s get the two layers of the motherboard well aligned on the heating platform, then set the proper temperature and turn on to heat to recombine the two layers of the motherboard.

03 Solder it back to test

After recombination, assemble the phone to have a test, and the flash LED function back to normal.

04 the flash function back to normal

But the Wi-Fi and Baseband function still not working, it seems that the issue is not so easy to be fixed.

Separate the motherboard again and check the motherboard, since it’s the Wi-Fi and the Baseband function abnormal, let’s carefully check the signal board first. The Wi-Fi and Baseband chip have not been fixed before

05 The Wi

When we continue to check the lower part of the motherboard, find some abnormal 

06 when we continue to check the lower part of the motherboard

Zoom in to have a check, there are a lot of tin balls

07 Zoom in to have a check there are a lot of tin balls

The issue should be caused by the tin pads causing some bridge connection.

Repair Process

Remove the chips at the bottom part one by one. 

08 Remove the chips at the bottom part one by one

Then the tins under the chips can be cleaned thoroughly and easily.

After cleaning the pads on the PCB, let’s solder back the chips

09 After cleaning the pads on the PCB lets solder back the chips

Test the function on the test fixture to see if the Wi-Fi and Baseband Function back to normal or not

10 Test the function on the test fixture to see if the Wi Fi and Baseband Function back to normal or not

Type *#06#, we can see the device information, Wi-Fi button also back to normal.

The issue gets fixed by resoldering the chips at the bottom side of the logic board.

Lesson learned

Form a good repair habit, and avoid “polluting” the motherboard with extra tin balls, paste, or flux. 

iPhone 12 Issue Repair

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REWA Academy

As an enthusiastic educator and expert in mobile technology, REWA Academy has dedicated its career to empowering individuals through technical education. With a keen focus on cellphone repairs, they have developed comprehensive online and offline courses at REWA Academy. Their expertise spans a wide array of areas, including iPhone repair training, phone hardware, software, and advanced troubleshooting techniques. Through their writings, they aim to demystify mobile technology complexities, making it accessible and understandable for both novices and professionals in the field.

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