How to diagnose Samsung Galaxy A40 Charging Problems

步骤 1 +5V line




• This is the +5V line from the Charging port to the Motherboard.
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步骤 2 Back cover removal.




• 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.
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步骤 3 Fingerprint sensor
• Remove the plastic cap from the Fingerprint flex cable connector and disconnect the cable.
• Remove the SIM Tray.
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步骤 4 Middle frame removal
• Use a plastic tool to separate the back cover from the frame. Start from the SIM tray hole.
• Disconnect the battery.
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步骤 5 Measurement
• 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.
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步骤 6
• 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.
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