The iphone 6 Plus SIM card is not recognised

The SIM card is a phone card that is used to make a call. If your phone does not recognize the SIM card, it means that your mobile phone is a game console and you cannot call. Normally, all mobile phones can recognize the SIM card, but if When you encounter a phone that does not recognize the SIM card, how can this problem be handled? the client sends an iPhone 6 Plus .According to his description, the main mistake is that the card can't be recognized after inserting in the Phone 6P card slot.

This failure is usually caused by a mobile phone SIM card slot.How to test and repair the damaged section?
The iphone opening toolkits can help to disassemble the iPhone 6 Plus.It is prefer to use a digital multimeter to measure that ground value of the SIM card slot.it is found that the SIM card slot 1 pin PP_LDO5 is short circuit to the ground. As shown in Picture .

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After connecting the WUXINJI Dongle on the computer, observe the iPhone 6 Plus bitmap, showing that the PP_LDO5 is sent from the baseband power to the baseband CPU, SIM slot 1 pin, capacitor C3100_RF and diode DZ3101_RF. As shown in Picture 







Based on our previous experience of repair.this situation is unlikely to be the CPU damage of the baseband, so we first remove the baseband power supply, and still short circuit after disassembly. Then we remove the capacitor C3100_RF, and the grounding resistance is normal now

Seems the problem settled, restart the baseband iPhone6 Plus testing power and opening, it can identify SIM card.
After activation, all functions are tested normally and the repair is complete.
IF you have any other problems for cell phone repair and related tools, please research on www.vipfixphone.com

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