iPhone XR Function Failure Repair Cases

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Some iPhone XR function failure repair cases for reference

Case 1.

Cannot boot and with a large current once connect with the DC power supply.

Use the rosin inspection method, and find it’s caused by C5655 short damage, the capacitor is related with PP_DISPLAY_BL12_ANODE. Replace it with a new one, then the short is gone and the phone can be started up normally.

C5665

C5665 on the bitmap

Case 2.

The speaker only rings once.

This kind of issue normally is caused by the speaker amplifier IC poor soldering. Check the two speaker amplifier IC may take a longer time, so we just replace the two chips (U5102, U4902) together directly.

Replace the two speaker amplifier IC

After that, the speaker function back to normal.

Case 3.

No display.

Defect phenomenon: no display but the boot current is normal.

In this kind of situation, first, we can check the connector and components around it. After checking, find the small inductor FL5752 is missing.

FL

Check the bitmap, it’s related to the PMU_TO_DISPLAY_RESET_CONN_L signal.

FL5752

So we can jump a wire to test, that the phone can display normally. Then replace a new inductor with the same specification. Issues get fixed easily by FL5752 replacement.

FL5752 Specifications

Case 4.

No baseband function after serious drop damage.

For the no baseband issue, we can focus on checking the chips and components related to the Baseband CPU, Baseband PMU, transceiver IC and small components around them.

Remove the shield cover on the BB PMU and transceiver IC first.

(Tips: use a hot air gun to remove the shielding cover slightly, better not use a cutter to avoid the crack damage to chips under the cover)

iPhone XR Function Failure Repair

After that, measure the diode values of the small components around the two big chips.

Luckily, we found the C906_K is shorted easily.

Shorted C906K 1

Check the Refox bitmap, it’s related to the power supply of PP_1V3_SMPS3_XCVR_ANA, it’s a filter type capacitor. We can just remove it or replace it with a new one.

In order to ensure the Baseband and RF function works more stable, better replace a new capacitor with the same specifications.

C906 K 10uf

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REWA Academy

As an enthusiastic educator and expert in mobile technology, REWA Academy has dedicated its career to empowering individuals through technical education. With a keen focus on cellphone repairs, they have developed comprehensive online and offline courses at REWA Academy. Their expertise spans a wide array of areas, including iPhone repair training, phone hardware, software, and advanced troubleshooting techniques. Through their writings, they aim to demystify mobile technology complexities, making it accessible and understandable for both novices and professionals in the field.

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