When you come across your iphone 6s SIM card no service This article is about how to fix iphone 6s, when your iphone 6s new SIM card no service. You will use some iphone repair tools to fix , for your quick and correct use vipprogrammer products, carefully read this guide and prudent to do.
1. There are IMEI, modem firmware and ICCID in “about iPhone”, but there is not IMEI when dialing *#06#. Checking PCB circuit diagram bitmap we find the testing point of RFFE1 bus is PP3170_RF and PP3171_RF. The testing point is shown in picture and the material object is shown in picture,too.
2. After measuring the diode data of RFFE1 bus, we find the data of PP3171_RF is too large. Teardown baseband CPU to measure the diode data of pin U1 and the data is infinite. Scratch a circuit near pin U1 and connect it to pin U1 with a jump wire. After placing the wire, measure the diode data of U1. You will find the data is normal.
3. Doing BGA Reballing on baseband CPU, and weld baseband CPU to PCB board.
4. Power on and use an oscilloscope to measure the wave of RFFE1_DATA of PP3171_RF under the state of bare board.
5. Measure the wave of RFFE1_CLK of PP3170_RF. The wave will normal.
6. Assemble the board to assembly and enter system to test. Lastly, everything is normal. The trouble is removed.
In this article you read some iphone repair tools, it be found in vipprogrammer.com, Thank you for using the vipprogrammer.