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Thursday 14 November, 2019 |

iPhone 7 Plus won't turn on with logic board repairing

When press the iPhone 7P power button, it's not responded, the iPhone 7 plus won't turn on. Connect the iPhone 7P to the computer via iPhone lightning cable to check if it can be recognized, after connecting, the iPhone 7P can't be recognized by the computer. Here is a solution for logic board repairs that can fix this problem.

Plug an iPhone charge cable to the iPhone 7 Plus to test the iPhone charging current, the charge current jumps around 200mA, and won't stop.

Use screwdrivers to remove the screws next to the iPhone lightning port, and then use LCD opening tools to open the iPhone screen. Remove the iPhone display assembly, disconnect the iPhone battery, and then take out the iPhone motherboard.

Measure the iPhone motherboard with a DC power supply, the standby current is 0, which means no leaks. Trigger the iPhone 7P, the current up to 1.9A, which is large current.

Apply some rosin to the soldering iron, and then use soldering iron to smoke the rosin to the logic board. Supply power to the motherboard, after a while, we can see that the rosin on the area around the iPhone main power IC melted firstly, is the iPhone main power IC damaged?

Login to the ZXW online account to check iPhone 7P schematic diagram, we found that the iPhone Nand flash power supply also in the heating area. Use digital multimeter to measure the iPhone Nand flash, it's short-circuited.

Use BGA graver blade to scratch the power supply capacitor around the iPhone Nand flash, and then apply some rosin to it with DES H95 soldering station, we found C1719 capacitor was shorted.

Use soldering iron to remove C1719, and then use digital multimeter to measure it again, now the data measured is normal.

Assemble the iPhone 7 Plus, press the iPhone power button, now the iPhone 7 Plus can be turned on successfully.

by Bellin

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