Connect the Integrated Current Checker tool to a known-good Apple computer that is running the latest version of iTunes. Connect a known-good Lightning to USB cable to the tool. Important: The Integrated Current Checker tool should be connected directly to an Apple computer. The computer must be turned on and awake during testing. Do not connect the tool to the keyboard or other device. If an Apple computer is not available, then connect the tool to an Apple USB Power Adapter. Note: If a network configuration dialog box appears when the tool is connected to the computer, then click Cancel and proceed to the next step.
Connect the iPhone to the Lightning to USB cable, which is connected to the Integrated Current Checker Tool.
Allow the reading to stabilize for at least five seconds before interpreting the results. If the reading from the Integrated Current Checker Tool fluctuates more than .001 in the next 10 seconds, then disregard the Interpreting the Results section below, search GSX for “No Power,” and select the troubleshooting steps for the model under review.