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Measurement
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Disconnect the main flex cable and connect the charger.
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Use a multimeter to measure the voltages at the large end pins of the FPC connector of the charging board. (See the second image)
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If the reading is okay (~5V) continue with the next step, if not - change the Charging board.
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Attach the main flex cable and measure the large end pins of the Main flex FPC connector - pic.3.
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If the reading is okay, continue with the next step, if not - change the Main flex cable.
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