How to Fix a Samsung Galaxy S10 Plus That Does Not Turn On/Power On

1 단계 Power Integrated Circuit (IC)




• Check the state of the motherboard. Both the power integrated circuit (IC) and camera IC have been soldered before.
• Install the motherboard to test it. Connect the display and the power cable. The motherboard shows a current leakage of 52 mA.
• Press the power button. Here, the reading has not changed. Therefore, the main power supply line of the motherboard may be faulty.
• Measure several power supply lines of the motherboard using the multimeter's diode mode. Inductor L5039 is shorted to the ground.
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2 단계



• Open the schematic. It shows that L5039 is directly connected both to the main power supply line VBAT, and to the power IC U8031.
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3 단계
• Since power IC U8031 has been soldered previously, we need to verify if it is faulty as a result.
• Attach the motherboard to the holder, applying some paste flux to the power IC.
• Heat with a hot air gun set at 340°C and airflow 3 to remove the IC.
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4 단계
• Clean the bonding pad with solder wick.
• Measure the inductor L5039 using the multimeter's diode mode.
• Here, the diode value is 289, which is normal. Therefore, we can conclude that the power IC fault has resulted in the short circuit of the main power supply line.
• Clean the bonding pad with PCB cleaner and apply some paste flux.
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5 단계

이 단계에 사용된 도구:
Tweezers
$4.99
구매
• Align the new IC. Solder it with a hot air gun set to 340°C and airflow 2. Once the motherboard has cooled, connect the power cable.
• Trigger the boot-up with tweezers. The boot current returns to normal.
• Install the motherboard. The phone turns on normally. The fault has been cleared.
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