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How to diagnose Samsung Galaxy A40 Charging Problems

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  1. How to diagnose Samsung Galaxy A40 Charging Problems, +5V line: 1 단계, 이미지 1/3 How to diagnose Samsung Galaxy A40 Charging Problems, +5V line: 1 단계, 이미지 2/3 How to diagnose Samsung Galaxy A40 Charging Problems, +5V line: 1 단계, 이미지 3/3
    • This is the +5V line from the Charging port to the Motherboard.

  2. How to diagnose Samsung Galaxy A40 Charging Problems, Back cover removal.: 2 단계, 이미지 1/3 How to diagnose Samsung Galaxy A40 Charging Problems, Back cover removal.: 2 단계, 이미지 2/3 How to diagnose Samsung Galaxy A40 Charging Problems, Back cover removal.: 2 단계, 이미지 3/3
    • Warm the device to soften the adhesive.

    • Use Sanction cup, Plastic tools and isopropyl alcohol.

    • Remove the silver Phillips screws from the device's frame.

  3. How to diagnose Samsung Galaxy A40 Charging Problems, Fingerprint sensor: 3 단계, 이미지 1/3 How to diagnose Samsung Galaxy A40 Charging Problems, Fingerprint sensor: 3 단계, 이미지 2/3 How to diagnose Samsung Galaxy A40 Charging Problems, Fingerprint sensor: 3 단계, 이미지 3/3
    • Remove the plastic cap from the Fingerprint flex cable connector and disconnect the cable.

    • Remove the SIM Tray.

  4. How to diagnose Samsung Galaxy A40 Charging Problems, Middle frame removal: 4 단계, 이미지 1/3 How to diagnose Samsung Galaxy A40 Charging Problems, Middle frame removal: 4 단계, 이미지 2/3 How to diagnose Samsung Galaxy A40 Charging Problems, Middle frame removal: 4 단계, 이미지 3/3
    • Use a plastic tool to separate the back cover from the frame. Start from the SIM tray hole.

    • Disconnect the battery.

  5. How to diagnose Samsung Galaxy A40 Charging Problems, Measurement: 5 단계, 이미지 1/3 How to diagnose Samsung Galaxy A40 Charging Problems, Measurement: 5 단계, 이미지 2/3 How to diagnose Samsung Galaxy A40 Charging Problems, Measurement: 5 단계, 이미지 3/3
    • Disconnect the main flex cable and connect the charger.

    • Use a multimeter to measure the voltages at the large end pins of the FPC connector of the charging board. (See the second image)

    • If the reading is okay (~5V) continue with the next step, if not - change the Charging board.

    • Attach the main flex cable and measure the large end pins of the Main flex FPC connector - pic.3.

    • If the reading is okay, continue with the next step, if not - change the Main flex cable.

  6. How to diagnose Samsung Galaxy A40 Charging Problems: 6 단계, 이미지 1/3 How to diagnose Samsung Galaxy A40 Charging Problems: 6 단계, 이미지 2/3 How to diagnose Samsung Galaxy A40 Charging Problems: 6 단계, 이미지 3/3
    • Remove the adhesive rubber around the main flex connector on the logic board.

    • Use some flux and a soldering iron to re-solder the first pin of the motherboard FPC.

결론

To reassemble your device, follow these instructions in reverse order.

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