iPhone XS Max can't be charged for maintenance

iPhone Xs Max can’t be charged for maintenance

Malfunction model: iPhone Xs Max
Malfunction: can’t be charged, and it doesn’t respond.

iPhone XS Max can’t be charged for maintenance Figure 1.

Maintenance process: after receiving the mobile phone, the charger has no charging current, then disassemble the machine and use DC power supply to start the machine normally.

First, find a back shell assembly to replace it, and eliminate the non-charging caused by Accessories. The failure of FPC after replacing the rear case remains the same, remove the motherboard, and then the heating table separate on the motherboard will come down for inspection.

iPhone XS Max can’t be charged for maintenance Figure 2.

Good stratification. YANGTZE_LDO shorted to ground of U3300 charging chip was found in the inspection.

iPhone XS Max can’t be charged for maintenance Figure 3.

iPhone XS Max can’t be charged for maintenance Figure 4.

iPhone XS Max can’t be charged for maintenance Figure 5.

Remove U3300 charging IC YANGTZE_LDO and return to normal to diode value.

iPhone XS Max can’t be charged for maintenance Figure 6.

iPhone XS Max can’t be charged for maintenance Figure 7.

Next, deal with PAD and replace it with a good charging chip.

iPhone XS Max can’t be charged for maintenance Figure 8.

Clean up the motherboard, and test the motherboard welding for installation. The charging returns to normal, the function is normal, and the maintenance ends here.

This fault is that U3300 charging IC is not charged due to damage.