iPhone 6S Plus WIFI repair no service, how to deal with it?
We received an iPhone 6S Plus, customer feedback After inserting the SIM card, the iPhone 6S Plus has no signal or service, and the customer said that he repaired the WIFI fault by himself. Then this happened. He doesn't know what to do, he hopes we can fix his iPhone. The following is the repair process.
Repair process:
Turn on the iPhone 6SP, insert the SIM card for testing, and display “No Service”. The carrier signal can be searched manually but is unstable.
Continue testing, the signal is normal when you turn on 4G in Cellular Data, it can connect to the 4G network. It's normal to make phone calls and browse the Web，but the signal is bad. Turn off 4G, and then choose 3G and 2G, both of them are showed no service.
The 4G signal can be searched normally, but 2G and 3G are no service, we suspected that the fault should be an iPhone antenna switch or a 2G amplifier.
Is it an error in the antenna switch frequency selection? We decided to replace the antenna switch and test it. After remove the antenna switch, use digital multimeter to measure the diode data, we found the 21th PP_2V8_LD014 power supply of the ULASM_FR antenna switch is grounding short-circuited.
Open the WUXINJI to check the iPhone schematic diagram, we found the PP_2V8_LDO14 is connected to many places, one of them was sent to the filter U_VOX_RF next to the iPhone WIFI IC.
Measuring the diode data for all the power supply of filter, we found there are several power supply circuit are short-circuited.
According to the description of the customer, we judged that the fault is that the tin ball of the filter next to the iPhone WIFI IC was burned when he repairing the iPhone WIFI IC.
Use QUICK 861DW hot air rework station and Titanium Alloy Tweezers to remove the U_VOX_RF directly，and then turn on iPhone to test, now the 2G, 3G and 4G signal can be searched normally, and the signal tested is normal.
After re-installing the U_VIX_RF, all functions are normal, the repairs end!
If you need any help, please feel free to contact our phonefix store team at www.vipprogrammer.com.
Repair process:
Turn on the iPhone 6SP, insert the SIM card for testing, and display “No Service”. The carrier signal can be searched manually but is unstable.
Continue testing, the signal is normal when you turn on 4G in Cellular Data, it can connect to the 4G network. It's normal to make phone calls and browse the Web，but the signal is bad. Turn off 4G, and then choose 3G and 2G, both of them are showed no service.
The 4G signal can be searched normally, but 2G and 3G are no service, we suspected that the fault should be an iPhone antenna switch or a 2G amplifier.
Is it an error in the antenna switch frequency selection? We decided to replace the antenna switch and test it. After remove the antenna switch, use digital multimeter to measure the diode data, we found the 21th PP_2V8_LD014 power supply of the ULASM_FR antenna switch is grounding short-circuited.
Open the WUXINJI to check the iPhone schematic diagram, we found the PP_2V8_LDO14 is connected to many places, one of them was sent to the filter U_VOX_RF next to the iPhone WIFI IC.
Measuring the diode data for all the power supply of filter, we found there are several power supply circuit are short-circuited.
According to the description of the customer, we judged that the fault is that the tin ball of the filter next to the iPhone WIFI IC was burned when he repairing the iPhone WIFI IC.
Use QUICK 861DW hot air rework station and Titanium Alloy Tweezers to remove the U_VOX_RF directly，and then turn on iPhone to test, now the 2G, 3G and 4G signal can be searched normally, and the signal tested is normal.
After re-installing the U_VIX_RF, all functions are normal, the repairs end!
If you need any help, please feel free to contact our phonefix store team at www.vipprogrammer.com.
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