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소개

This guide will help you diagnose the Samsung Galaxy A70, Samsung Galaxy A50, and the Samsung Galaxy A20. This guide might also work for other Samsung models.

동영상 개요

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

  2. Diagnose A Samsung Galaxy A40 Charging Problem, Back cover removal.: 2 단계, 이미지 1/3 Diagnose A Samsung Galaxy A40 Charging Problem, Back cover removal.: 2 단계, 이미지 2/3 Diagnose A Samsung Galaxy A40 Charging Problem, Back cover removal.: 2 단계, 이미지 3/3
    • 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: 3 단계, 이미지 1/3 Diagnose A Samsung Galaxy A40 Charging Problem, Fingerprint sensor: 3 단계, 이미지 2/3 Diagnose A Samsung Galaxy A40 Charging Problem, 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. Diagnose A Samsung Galaxy A40 Charging Problem, Middle frame removal: 4 단계, 이미지 1/3 Diagnose A Samsung Galaxy A40 Charging Problem, Middle frame removal: 4 단계, 이미지 2/3 Diagnose A Samsung Galaxy A40 Charging Problem, Middle frame removal: 4 단계, 이미지 3/3
    • ''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: 5 단계, 이미지 1/3 Diagnose A Samsung Galaxy A40 Charging Problem, Measurement: 5 단계, 이미지 2/3 Diagnose A Samsung Galaxy A40 Charging Problem, Measurement: 5 단계, 이미지 3/3
    • 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: 6 단계, 이미지 1/3 Diagnose A Samsung Galaxy A40 Charging Problem: 6 단계, 이미지 2/3 Diagnose A Samsung Galaxy A40 Charging Problem: 6 단계, 이미지 3/3
    • Remove the adhesive rubber.

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

결론

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

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ZFix

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