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

Written By: REWA
  • Comments: 1
How to Fix a Samsung Galaxy S10 Plus That Does Not Turn On/Power On

Difficulty

Very difficult

Steps

5

Time Required

45 minutes - 1 hour

Introduction

This guide details how to repair a Samsung Galaxy S10+ that will not power on.

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    • 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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    • 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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    • 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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    • 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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    • 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.

Conclusion

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

Author

REWA

Member since: 24/11/20

14012 Reputation

One comment

sir. in step 4. i remove IC U8031 and Clean the bonding pad with Solder Wick.but when i Measure the inductor L5039 with diode mode of the multimeter. The diode value is shorted to the ground. How i fix it? thank i’m from Thailand

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