Top FIX Tips: For iphone 6 no service

When someone calls you iPhone, Your cell phone doesn’t sound，Even mobile phones have no service，Here are some fixes you can try! You must know what can you do and can’ t do. Now you can follow VIP Pro Shop Team to do your save job. hoping your Cell  phone can back well.

A faulty iPhone 6, it is accidently fell into ground. Now, when we input *#06#, it can't display IMEI number. As shown in picture 7-13-1. Furthermore, when we insert the SIM card, it does not recognize the operator. We suspect that the problem is RF part. 

Base on the faulty description and according our experience, we can make sure that the service error was caused by RF circuit part. Now, we need to fix it step by step.

1. Disassemble the iPhone 6 with screwdrivers, carefully remove the motherboard. 

2. Using multimeter to measure the diode data of testing point PP3172_RF, the result of value is 0. The near place of it is U_DSM_RF, U_HBS_RF, U_ASM_RF, MDM9625M and U_FFER. We can check it in the circuit diagram, as shown in picture 7-13-2, 7-13-3, 7-13-4, 7-13-5.

as shown in picture 7-13-3:

as shown in picture 7-13- 4:

as shown in picture 7-13-5:

3. Because we are not sure which chip is causing a short circuit error, so we need to tear down the adjacent chips and test it. We’ve removed several adjacent chips, but the short circuit error still exists, until we tear down the U_BUFFER, it doesn't show a short circuit fault when we measure it with multimeter. As shown in picture 7-13-6.

4. Replace the new U_BUFFER IC on it, and assemble the chips that were removed. Then reload the iPhone 6. 

Finally, power on iPhone 6, when we input *#06#, the IMEI appears on the LCD screen. When we insert the SIM card, the signal is back, and it can make the phone call normally. The iPhone 6 was repaired!

Tips: Vip Pro Shop Team can provide all of these for you, if you have any problem or needed, please contact us.