Wat je nodig hebt
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Remove the two pentalobe screws at the bottom edge and lift the screen.
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After the screen is lifted, take the shielding covers off, disconnect the battery, and remove the screen.
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Connect the motherboard with the Power Cable. The ammeter shows a large current of 3.1A.
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Detach the motherboard and connect the motherboard with the Power Cable again. The ammeter still shows a large current of 3.1A.
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Run diode mode measurement of pin 1 on the J7010 of the battery connector. The diode value is 0 which indicates that the main power supply circuit is shorted to the ground.
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Run diode mode measurement of pin 286 on the signal board. The diode value is 0. It suggests that the main power supply of the signal board is shorted to the ground.
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Measure pin 286 on the logic board. The diode value is 363 which means the logic board is normal.
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Open the bitmap. We can see there are many associated components on the main power supply circuit.
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Set the direct current supply to 4.1V. Connect the positive and negative anode of the direct current supply with multimeter probes. Connect the black probe to the ground and connect the red probe to pin 286 on the signal board.
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We can see rosin on C1200_K has melted. It indicates that the capacitor is damaged.
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Then we heat the damaged capacitor with Hot Air Gun at 350℃ and remove it with tweezers.
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Clean the signal board with PCB Cleaner. Remove tin and clean the logic board with the same method.
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Attach the signal board to the Reballing Platform and put the Reballing Stencil in position. To prevent the solder paste from flowing into the motherboard crevices, insert a metal plate.
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Apply a layer of low-temperature Solder Paste.
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Connect the motherboard with the Power Cable and short to the ground of the J7700 pin 12. The boot current becomes normal.
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Put the motherboard on the phone. Connect the flex cables, screen, and battery. Because the battery is dead, plug the charging cable and the phone turns on normally.
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iPhone 11 Pro won’t turn on with a large current. We found that the main power supply was shorted to the ground through measuring the battery connector. The fault was found to be on the signal board after separation. Rosin detecting showed us that C1200_K was damaged. After removing C1200_K, the fault was cleared.
iPhone 11 Pro won’t turn on with a large current. We found that the main power supply was shorted to the ground through measuring the battery connector. The fault was found to be on the signal board after separation. Rosin detecting showed us that C1200_K was damaged. After removing C1200_K, the fault was cleared.
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