Attach the upper layer and the lower layer to the test fixture. Get the back glass assembly connected. Connect the battery connector with the DC Power Supply.

Connect the iPhone to the computer with the USB cable. Restore the phone via iTunes. Once done, disconnect the USB cable, the power supply, and the back glass assembly.

Again, let’s get the display assembly installed. Connect the battery connector with the Power Supplier. The phone goes with activation process.

Click the icon at the bottom right corner. Serial number and IMEI number display normally on the screen. Signal bars in the upper-right corner is back to normal. We can confirm now that the No Service problem is caused by U_PMIC_E.