Your iPhone won’t turn on because either the software crashed and needs to be reset or restored, or a hardware problem is preventing your iPhone from turning on. In this article, we demonstrate how to troubleshoot and fix iPhone 6 won’t turn on/current leakage with logic board repair. We hope you enjoy our sharing.
Step 1 Function Test
We have received a defective motherboard from our customer, we first run trough tests. Check the motherboard and we haven’t found any sign of pre-repair. Power the motherboard, the current jumps directly to 1.3A, which proves that the motherboard is leaking.
Step 2 Diagnosis
By using the temperature sensing method, we confirm the NAND area where is getting hot is defective. Measure the diode resistance of the NAND relevant circuit, the C0605 is measured normal, while the C0684 diode resistance is measured short circuit. The C0684 supplies 3V power to the NAND, based on circuit analysis, defective components such as capacitor, NAND, power supply IC can all cause the C0684 3V power supply short, to further confirm the exact defective area we use the rosin method.
Step 3 Troubleshooting
Dip and atomize the rosin by the soldering iron, then spray the atomized rosin evenly on the defective area of the motherboard, power on the motherboard and we observed the rosin on the capacitor C0684 melts very quickly, problem confirmed.
Step 4 Repairing
Heat up the capacitor C0684 with the hot air gun, and gently shake it with tweezers, then take it off. Then desolder the soldering pads and reinstall a new good capacitor.
Step 5 Restore the Chip
Cool down for 5 minutes, then assemble the motherboard, power on and test, all function works normal, repair completed.
Please refer to below detailed video:
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Tools and Materials Used in This Video:
Hot air gun
DC Power Supply