跳至主要内容

Fixed: How to Repair iPhone 6 Touch Part


If the touch function fails to work, you'll be unable to control your cell phone very well, which part may get damaged? How to repair this problem? Let's have a look in this article!

First of all, connect WUXINJI Dongle to check the iPhone 6 touch part power supply circuit. 

We can see from the schematic diagram of iPhone touch IC -- U2401 has two sets of power supply circuits, one is 1.8V power supply PP1V8_GRAPE that comes from iPhone power IC U1202, it can be measured in capacitor C2403, the other one is 5.1V power supply PP5V1_GRAPE_VDDH that comes from U1501.


And the iPhone touch IC-- U2402 has three sets of power supply circuits, PP1V8 comes from iPhone power IC U1202, PN5V7_SAGE_AVDDN is -5.7V that comes from U1501, PP5V7_SAGE_AVDDH is +5.7V that comes from U1501. The voltage for PN5V7_SAGE_AVDDN and PP5V1_GRAPE_VDDH can be measured when the iPhone display screen is lit，the data is +5.7V and -5.7V. The voltage for PP1V8_GRAPE and PP5V1_GRAPE_VDDE(5.1V) can be measured when the iPhone white touch ID is in good condition. If the iPhone white touch IC is abnormal, then there's no 5.1V. So, the 5.1V can't be measured, it is not necessarily the problem with the iPhone power IC, it may be the white touch IC problem.


If iPhone 6 touch function doesn't work well, you can measure the iPhone motherboard first with Fluke 15B+ Digital Multimeter to check whether there is a 5.1V. If there is no 5.1V, replace the iPhone power IC U1501, and then test it, if the iPhone touch function still not working, then you can use QUICK861DW hot air rework station and tweezers to replace the iPhone white touch IC.

Get more cell phone repair tutorials from 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