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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.
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This is the +5V line from the Charging port to the Motherboard.
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Warm the device to soften the adhesive.
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Use Sanction cup, Plastic tools and isopropyl alcohol.
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Remove the silver Phillips screws from the device's frame.
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Remove the plastic cap from the Fingerprint flex cable connector and disconnect the cable.
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Remove the SIM Tray.
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Use a plastic tool to separate the back cover from the frame. Start from the SIM tray hole.
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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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Remove the adhesive rubber around the main flex connector on the logic board.
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Use some flux and a soldering iron to re-solder the first pin of the motherboard FPC.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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