Based on repair experience, in this article, we would like to share the common fault components for iPhone 7.
- Audio CODEC IC
Part Number: 338S00105 (U3101)
Model: For iPhone 7/7 Plus
This back side of the chip is the SIM connector, so might be the board design problem, which may easy to cause the Audio CODEC IC poor soldering or pads missing.
The most common repair method for iPhone Audio issues is to remove the Audio CODEC IC and jump wire to fix. See as below, Pin F12 and C12 are easy to get pad missing or poor soldering.
2. USB IC
Part Number: 610A3B (U4001)
Model: For iPhone 7/7 Plus
In the charging circuit, USB IC plays the role of doorkeeper to monitor the voltage introduced.
If the input voltage is too high, USB IC will be “killed” first.
3. Charging IC
Part Number: SN2400AB0 (U2101)
Model: For iPhone 7/7 Plus
Nickname for this chip: Tigris
For the charging issue, if after replacing the USB IC the issue is still unresolved. Then most of the time it’s caused by the charging IC, we can replace a new charging IC to have a try.
4. SPK/ Earpiece/ Vibrator Amplifier IC
Part Number: CS35L26 338S00220 (U3301/U3402/U3502)
Model: For iPhone 7/7 Plus
(The vibrator AMP IC, SPK AMP IC, and Earpiece AMP IC are compatible)
5. Backlight IC
Part Number: LM3539A1 (U3701 for IP7)
Model: For iPhone 6S/6S Plus/7/7 Plus/8/ 8 Plus
For no backlight issue, for half bright, half dim issue. There’s a chance the issue is caused by the damage of the backlight IC as marked in the above picture. Can try to replace the chip with a new one directly.
6. Display And Touch Power IC
Part Number: TPS65730A0PYFF (U3703 For IP 7/7P)
Model: For iPhone 5C/5S/6/6P/6S/6SP/7/7P/8/8P/XR
Nickname for this chip: Chestnut
The chip is mainly responsible for providing powers for the display and the touch circuit. See details as the below block diagram.
If there’s an issue with totally no touch or no display.
First, we can measure the diode value on the display and touch connector J4502, to see whether each pin diode value of the connector is OK or not?
If all diode values are OK, then we can try to replace the U3703 with a new one.
7. Wi-Fi Module
Part Number: LBEE5W11GJ 339S00199 (WLAN_RF)
Model: For iPhone 7/7 Plus
For no Wi-Fi issue, like the Wi-Fi button blackout, there’s a high chance it’s caused by the Wi-Fi chip get damaged. We can try to replace the Wi-Fi chip directly to have a try.
(Tip: After replacing the Wi-Fi chip, we will need to use some programmer like iRepair P10 DFU BOX
to unbind the connection between the Wi-Fi module and NAND Flash chip)
8. PMU (Power Management Unit)
Part Number: D2333A1 338S00225 (U1801)
Model: For iPhone 7/7 Plus
As the main chip to provide powers. PMU also with a high chance to get damaged.
But luckily, not like the CPU or baseband CPU, PMU is not encrypted, so when the PMU gets damaged, we can replace it with a new one.
9. Baseband PMU
Intel Version Part Number: PMB6826 (BBPMU_RF)
Qualcomm Version Part Number: PMD9645 (BBPMU_RF)
Model: For iPhone 7/7 Plus
Tips when repair
- Pay attention to the version of the chip
- Pay attention to the protection of components around it, and ensure your hands-on work is good enough. So that not cause damage to the PCB and Baseband CPU at the backside.
10. Transceiver IC
Intel Version Part Number: PMB5750 WTR3925 (XCVR0_RF)
Qualcomm Version Part Number: WTR3925 (XCVR0_RF)
Model: For iPhone 7/7 Plus
For other IC chips which also might with damage risk, you can find from REWA chop
And if you need to learn the troubleshooting and hands-on practical skills of iPhone repair
You may visit the REWA Academy to learn the courses.
