iPhone X SIM Card Cannot Be Recognized

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Malfunction Phenomenon

The SIM card cannot be recognized on the phone.

Trouble Shooting

First, we need to take apart the phone and run the cosmetic inspection of the motherboard. There is no water damage or deformation.

Then measure the working voltage of the SIM card connector, the measured value pin of SIM_DETECT is 0.45V, which is abnormal (normal voltage value should be around 1.8V). 

From the circuit diagram, we can try to replace R202_E (100K) with a new one (1K).

SIM Card Cannot Be Recognized

 

SIM Card Cannot Be Recognized

After finish replacing the resistor, then assemble it, and test again, the problem resolved.

Tips:

For the SIM card issue, like no SIM card. We need to focus on checking the related pins diode value and voltage values.

If there’s any abnormal, then refer to the block diagram or the schematics to check and find out the relevant components then get it replaced.

Here, in this case, the voltage on the SIM_DETECT should be around 1.8V. But the actually measured result is 0.45V only. So the possible reason is the resistor with a problem. So in order to introduce a proper voltage into the rail, we can try to change a very small resistor to have a try.

iPhone X 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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