跳至主要内容

Expert Guide: iPhone X Not Charging Fault Repair

As we know, iPhone X is the latest iPhone models designed with many new features, obviously it's one of your best choice when choosing cell phones, but there are some faults you can't avoid whatever cell phone you use. In this article, we are going to repair an iPhone X charging fault.

First of all, be clear about the iPhone X charging principle, we can check on WUXINJI Dongle. Plug iPhone data cable, the iPhone tail plug connector J6400 47/48 pin gets 5V input voltage PP_VBUS1_E75, at the same time, the 20 pin HYDRA_CON_DETECT_CONN_L will be pull down.

5V of PP_VBUS1_E75 send to U3300, after R3360 output PP_VBUS1_E75_RVP, finally sent to U6300.

HYDRA_CON_DETECT_CONN_L is renamed HYDRA_CON_DETECT_L by R6410.

HYDRA_CON_DETECT_L send to the multifunctional electronic switch tube U6300 G3 pin, when the U6300 received a low power lever signal, then access identification iPhone lightning cable.

If U6300 received the 5V power supply, and detected after the tail plug access，it will transmit information to the CPU via UART data interface. After the iPhone charge control IC U3300 received the 5V, it will transfer the information of the external 5V to the CPU VIA R3332. In this time, the iPhone battery icon will turn to green and the lightning sign appears.

When the iPhone needs charging, the U6300 will send open signal HYDRA_TO_TIGRIS_VBUS1_VALID_L to U3300, U3300 works, and then the iPhone start to charge.

Now we've got clear about the principle, next, we are going to measure the detection signal HYDRA_CON_DETECT_L that from the interface to U6300, it is normal.

Measure the 5V voltage PP_VBUS1_E75 with Fluke 15B+ Digital Multimeter, the data only has 4.5V, the problem was found. If the U3300/U6300 can't detect the normal 5V, the iPhone X can't be charged.

Measure the diode data for 5V, it is more than 1600, which is abnormal. After replace the U3300 and then measure it again, the problem still there. Now, with the help of the QUICK 861DW hot air rework station and tweezers, we've replaced the all circuit components that are connected to the PP_VBUS1_E75_RVP that are converted by U3300, but the data tested still is abnormal.

Check the peripheral circuitry of each attached chip, when measuring the U3300 TIGRIS_LDO，it is short circuit, and this voltage only connects 2 capacitance.


Replace the capacitance, now the iPhone X can be charged, everything goes well.

More cell phone repair skills and related repair tools you have need, please contact us on www.vipfixphone.com

标签：

评论

发表评论

此博客中的热门博文

iPhone 6 Display Failure after Replacing LCD

The iPhone 6 display is black after replacing LCD. After checking, the diode data of display socket is normal and all power supply for iPhone display IC  output is normal. Testing by  DC power supply , we find the iPhone current is abnormal. When press the iPhone power button, the boot current is obviously large. The current reached 100mA when press the power button. After remove the display tube, the current still the same, which means there is a short circuit. Measure the voltage output of each circuit of power supply with Fluke 15B+ Digital Multimeter , then surprised to find that there are really short circuit places. LD010 is short circuit; we suspect that the filter capacitance on the circuit has been penetrated. After remove the iPhone power control IC , we found it is ground short circuit. Open the WUXINJI Dongle  to check the iPhone schematic circuit, we found that this circuit is the display card image transmission MIPI data bus power supply. CPU brea...
发表评论
阅读全文

Solution: Why iPhone X Voltage Keeps Jumping

After getting the iPhone X motherboard to test, we observe the current value repeatedly jumps between 0mA and 50mA on DC power supply , and it is different from the normal booting current. Next, test whether the power supply of every circuit is normal. PP_VDD_MAIN is measured 4.2V; PP_VDD_BOOST measured is 4.2V. PP1V8-ALWAYS is 1.8V, all the values are normal. But when testing PP1V1_S2, PP0V8_SOC_FIXED_S1, PP1V8_S2 and other circuit voltage that output by power chip U2700 voltage are jumping constantly. According to previous experience, voltage jump is usually caused by a power supply circuit of U2700 output. Measured with digital multimeter , there is no short circuit was found for the dipole value of all power supply to ground. We repaired iPhone 7P before and know that if crystal oscillator is false welding can also cause voltage jumping, And if iPhone CPU  power supply is abnormal also can cause voltage jumping. Check the crystal oscillator we find no problem, then check th...
发表评论
阅读全文

Solution: iPhone 6 Signal Has No Service

We are going to fix an iPhone 6 device today, the iPhone 6 signal keeps searching state after booting, there is no baseband in local setting, and no series number shows up when dialing *#06# serial number. We find the iPhone 6 LCD (has been replaced once, this kind of situation is preliminary determined for baseband CPU false welding, it is relatively common situation on iPhone 6 and iPhone 6P. Anyway we need to test first! From the simple start, measuring the single iPhone 6 motherboard  baseband power supply, first measure the main power supply 4.2V (C3221_RF). Then testing basebnd output voltage of power supply on C3262, C3252, C3259, C3256, if there is a voltage without first measuring resistance, if resistance is normal, then replace normal baseband power test; if four of them are simultaneously without resistance, then you need to reinstall the baseband CPU. There is a small glass tube base strip above the baseband power supply, it must be noticed when the main ...
发表评论
阅读全文