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Different from previous versions, there is a built-in hardware detection for iPhone 8 series with booting process. Once Touch ID gets malfunctioned, the phone gets stuck on Apple logo during startup and can't continue past it to the home screen.

Resumen del Video

  1. Power on. Apple logo displays normally. Yet the phone gets stuck on Apple logo and can't boot up completel.y
    • Power on. Apple logo displays normally. Yet the phone gets stuck on Apple logo and can't boot up completel.y

    • Connect the phone to computer and restore via iTunes. Then insert the SIM card and activate the phone. The Home Button gets unresponsive with returning function. The phone fails to activate completely.

  2. Measure the power supply voltage of Home Button. The measured voltage value is 3.3V, 1.8V and 2.75V. Normal voltage value for the three sets of voltage.
    • Measure the power supply voltage of Home Button. The measured voltage value is 3.3V, 1.8V and 2.75V. Normal voltage value for the three sets of voltage.

    • The 3D flex cable and the home button flex cable are also not damaged.

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  4. Replace with a new display assembly and test. The problem remains the same.
    • Replace with a new display assembly and test. The problem remains the same.

    • Run diode mode measurement of the home button FPC connector J5800. The measured value is also normal.

    • There are obvious repair traces on J5800 under the microscope. So we can have the connector J5800 replaced for a try,

  5. Remove J5800 with Hot Air Gun. Clean the bonding pad and then solder a new connector.
    • Remove J5800 with Hot Air Gun. Clean the bonding pad and then solder a new connector.

    • Assemble the phone and test. The phone can be activated this time. But Touch ID fails. Restore the phone and test again. All going well.

    • With a carrier lock built into the phone, we should take out the SIM card after the activating process. Only in this way can we move to subsequent function test.

Phryne

Miembro Desde 17/11/19

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