iPhone 7 Plus Can Not Detect SIM Card

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Malfunction Phenomenon

iPhone 7 Plus can not detect SIM card. And the Baseband information was normal with IMEI when we press *#06#.

iPhone 7 Plus Can Not Detect SIM Card

Trouble Shooting

According to the malfunction phenomenon, we can try to check the SIM card reader firstly. 

Use the multimeter to check the diode values on the SIM card reader J_SIM_RF, we found the value on pin 1 was 0, which means that pin 1 was shorted to the ground.

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From the schematics, we could see that pin1 of J_SIM_RF was connected with BBPMU and Baseband CPU BB_RF via C5610_RF, C6900_RF, DZ6901_RF, so let’s continue to check the small components and chips. 

iphone 7 plus can not detect sim card

Remove the 3 components one by one, but the line was still shorted. then try to remove the BBPMU and measure diode value again, the short was gone.

So the issue should come from BB_PMU, get it replaced, and test again, the function back to normal, the problem was resolved.

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iPhone 7 Motherboard Repair Course

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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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