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  1. Diagnose A Samsung Galaxy A40 Charging Problem, +5V line: adım 1, 3 resimden 1. Diagnose A Samsung Galaxy A40 Charging Problem, +5V line: adım 1, 3 resimden 2. Diagnose A Samsung Galaxy A40 Charging Problem, +5V line: adım 1, 3 resimden 3.
    • This is the +5V line from the Charging port to the Motherboard.

  2. Diagnose A Samsung Galaxy A40 Charging Problem, Back cover removal.: adım 2, 3 resimden 1. Diagnose A Samsung Galaxy A40 Charging Problem, Back cover removal.: adım 2, 3 resimden 2. Diagnose A Samsung Galaxy A40 Charging Problem, Back cover removal.: adım 2, 3 resimden 3.
    • Worm the device to soften the adhesive.

    • Use Sanction cup, Plastic tools and isopropyl alcohol.

    • Remove the silver Phillips screws from the middle frame.

  3. Diagnose A Samsung Galaxy A40 Charging Problem, Fingerprint sensor: adım 3, 3 resimden 1. Diagnose A Samsung Galaxy A40 Charging Problem, Fingerprint sensor: adım 3, 3 resimden 2. Diagnose A Samsung Galaxy A40 Charging Problem, Fingerprint sensor: adım 3, 3 resimden 3.
    • Remove the plastic cap from the Fingerprint flex cable connector and disconnect the cable.

    • Remove the SIM Tray.

  4. Diagnose A Samsung Galaxy A40 Charging Problem, Middle frame removal: adım 4, 3 resimden 1. Diagnose A Samsung Galaxy A40 Charging Problem, Middle frame removal: adım 4, 3 resimden 2. Diagnose A Samsung Galaxy A40 Charging Problem, Middle frame removal: adım 4, 3 resimden 3.
    • ''Use plastic tool to separate the middle frame. Start from the SIM Tray hole.'

    • First of all disconnect the battery.

  5. Diagnose A Samsung Galaxy A40 Charging Problem, Measurement: adım 5, 3 resimden 1. Diagnose A Samsung Galaxy A40 Charging Problem, Measurement: adım 5, 3 resimden 2. Diagnose A Samsung Galaxy A40 Charging Problem, Measurement: adım 5, 3 resimden 3.
    • Disconnect the Main flex cable and connect the charger.

    • Use a multimeter to measure the voltages at the 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. Diagnose A Samsung Galaxy A40 Charging Problem: adım 6, 3 resimden 1. Diagnose A Samsung Galaxy A40 Charging Problem: adım 6, 3 resimden 2. Diagnose A Samsung Galaxy A40 Charging Problem: adım 6, 3 resimden 3.
    • Remove the adhesive rubber.

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

Sonuç

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

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