跳至主要内容

How to Repair iPhone 6 No Display and Earpiece No Sound Issues

We are going to repair an iPhone 6 device, according to customer's description, the iPhone 6 started fault with earpiece no sound, then he can not boot and iPhone screen shows black. How to repair these issues? Let's fix it step by step.
 


Connect it to DC power supply and boot, we found the current jumps normally, but the iPhone screen not display. After we connect it to computer, it prompts "please click on the device to trust".


Now we can judge that the iPhone 6 can boot, just the iPhone screen no display. Disassemble the iPhone and measure the resistance of the display socket; the diode data of the screen reset and open signal are all abnormal. Observe it under the microscope, we found the trace of the hitting on screws which on both sides of the left and right. Remove the iPhone screws, scrape it, and then solder the jump wire on it with soldering station, now the iPhone can display normally. Because diode data of fingerprint socket which on the right screws are normal, so we didn't scrape it.


After testing, it can record, playing a sound, the earpiece has no sound. Use multimeter to measure the diode data of iPhone front camera socket earpiece pin, the data is normal. The earpiece pin is through the inductor directly to the audio IC. Remove the iPhone audio IC, and then measure the diode data of I2S bus which is through to CPU, we found both the CODEC_TO_AP_XSP_I2S2_DIN and AP_TO_CODEC_ASP_I2SO_DOUT are infinitely large, it is open circuit.


Find an iPhonemotherboard to scrape it to check the line layout, scrape and ended up on the third floor of the right screw column.



Mend the wire and put it back into the chip. Assemble iPhone and test it, earpiece back to normal, the repairs end!

More cell phone repair tools and skills please visit www.vipfixphone.com to get whatever you need help!



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

Iphone 6S Enters DFU Mode Cannot Start Fault Repair

The customer said that he did not know what the reason was. The mobile phone has been restarted indefinitely and can enter the DFU mode. However, when the flashing machine fails to enter the recovery mode from the DFU mode, and then the mobile phone is connected to the computer for 5-10 minutes, it automatically enters the recovery mode. After we received the 6S that could not be started, we disassembled the power with iphone engraving tool and turned on the power to 100mA. First of all, check if you can connect and read the DFU mode after connecting to the computer. Wireless DFU can not exit, we can only brush the machine to view the error. Refresh Aisi and iTunes respectively. If you stuck on the progress bar for a long time, it is very likely that the error is -1. If the progress bar does not enter, you can roughly determine the probability of a CPU failure. Now we need to see if there is a problem with the hard drive. First, use DC power supply for iphone repair, the hard disk o...
发表评论
阅读全文