Fix iPhone 6 Sound failure: no voice, no earpiece, no speakers

 The iPhone 6 is ringing, and then you pick up, but no voice. Check  the other iPhone 6 sound, there are no voice, no earpiece and even no speakers. What's going on?  We need to find out the reason and then fix it!

  

First of all, we use the simplest elimination method to diagnose where the fault comes from, removing the iPhone Audio Flex Cable  to check the receiver; removing the earphone to test the speaker. After testing, there is still no voice. It can be judged that the chip is out of order.

The iPhone 6 U0900 big audio IC damage directly caused the 3 voice failure, it's relatively simple to disassemble and assemble large audio chip, layer welding spot is large while the iPhone audio chip is big and thin, so it's necessary to avoid excessive force to crush the chip during solder reballing process. Replace U0900 chip.

 

U1601 small audio water damaged phone comes out of a lot of problems, leading to large current, and there will be an automatic phone speaker. If the reset signal given by the iPhone CPU is abnormal, we can scrape and weld a jumper wire from the bottom of the chassis A6 track.

If the sound off and on, you can remove a small audio chip, when there is a temperature, measure the resistance value of the U1601 A6 track by digital multimeter.

iPhone 6 will also have a headphone mode, which automatically enters the headset mode without the plug in the headset.

The J1817 tail plug can be tested. If the block is normal, it will be solved by replacing the tail plug flex cable.

If there is the absence of a single sound instead of 3, we can replace the new parts, detect the circuit or test the block value, then basically you can find the problem.

In the end, assemble the iPhone 6 by JM-P01 Phone Repair Toolkit, and turn on it, get into the IOS to test all sound, all is fine. The repairs end!

   

Troubleshooting tips for iPhone X Abnormal problems

Today, we will share some troubleshooting  tips for iPhone X abnormal problems. Such as  iPhone X battery runs out quickly, iPhone X screen burn in, paint off on iPhone X frame, green line on iPhone touch screen and so on.  In the page, we will provide some troubleshooting  tips from software aspect.

1. iPhone X battery runs out quickly

After disassemble iPhone X with JM-9102 Disassemble Tools, you will found it has two batteries. However, it doesn't mean the iPhone X battery can be used for a long time, because some apps can impact battery life on your device. To find out which apps are consuming the most power, open Settings>Battery and you will see a list of apps that tells you which ones are the greediest. You can then choose to prevent those apps updating in the background or from using mobile bandwidth, which should help extend battery life.

Also, here are some tips for save iPhone battery life, turn off Location Services (Settings>Privacy>Location Services) and vibrate mode and notifications, adjust the iPhone brightness, switch on Settings>Battery>Low Power Mode, enable AirPlane mode.

2. The iPhone X screen has no response when it in cold

When the phone is in a cold environment, it will appear to touch no response, automatically switch vibration mode, and even automatic power down. If your iPhone X encounters this issue, please update it to latest IOS. Check which version of the IOS you are running in Settings>General>Software Update.

3. Green line appears on screen

Some iPhone X users reports that there is green appears on iPhone screen, this affects the visual effects of the iPhone X. Try to update your iPhone X to latest IOS, because Apple always use IOS update to solve many issues. If it is not working, then maybe the iPhone X need to be repaired, please send it to Apple.

4. Reboot iPhone X

Although rebooting the iPhone is not the way to do everything, but it is definitely a good way in many issues, it is no exception for fixing iPhone X issues. As we all know, iPhone X has an obvious difference from the previous iPhone, which is without iPhone home button. So, the method of reboot iPhone X also has some change.

Quickly click and release the Volume Up button.

Quickly click and release the Volume Down button.

Press the Side button (sleep/wake, on/off), until the Apple logo appears.

5. Reset iPhone X

If rebooting iPhone X does not solve the issues, then you can try to reset iPhone X. Before you reset your iPhone, you'd better back up your phone first. Go to Settings>General>Reset.

4 Steps To Fix iPhone 6 Won’t Turn On Issue

The iPhone 6 has been dropped heavily, and then the iPhone won't turn on and overheating. Now we need to repair it step by step.

Step 1

Disassemble the iPhone 6 by JM-P01 Essential Toolkit, take out the iPhone motherboard and measure it with DC power supply, it shows large current when booting, about 1300mA.

Step 2

The boot current shows about 1300mA, which is abnormal. Put the iPhone motherboard under a VGA Camera 7-45X Trinocular Stereo Microscope to observe it carefully, we found the culprit on the motherboard. There is a capacitor has been penetrated, which caused the iPhone to turn on with an abnormal large current phenomenon.

Step 3

Now, we've decided to dismantle this capacitor. With the help of Hot Air Gun and Precision Titanium Alloy Tweezers, we succeeded in tearing down this capacitor. Using Fluke 15B+ Digital Multimeter to measure it, the diode data shows more than 300, it is normal. This circuit is iPhone Nand flash power supply 3V, PP3VO_NAND short circuit will causes iPhone won't turn on, and the boot current up to 1000mA.

 

Step 4

After removal, measure it again with 1503D+ DC power supply, the boot current is normal now. Install the iPhone well, and the press the iPhone power button to turn it on, now the iPhone 6 can turn on normally and smoothly into IOS.

Re-repair the iPhone 6 Plus doesn't boot problem

 We received a damaged iPhone 6 Plus, the problem is that after the iPhone 6 Plus has replaced the iPhone touch IC, it is now not able to boot. We need to re-repair it.

According our experience, we need to check where we've been repaired before. Testing it with DC power supply, it doesn't leak, and the boot current stops at 400mA.

Considering the touch IC has been replaced, the last repairman directly took the black touch off without welding jumper wire on touch M1 pin(6P can still boot normally without installing black and white touch), but the current is same as before, measuring the starting voltage we find the iPhone 6 Plus NAND flash 1.8V and I2C bus 0.6 V, so we doubt it is the iPhone power IC problem. With the power on, it is indeed hot, with 400 degrees we quickly take the power IC off, according to the symptom, it's necessary to confirm whether the power supply IC is damaged, a good method is to measure the pin resistance.

The results of this 6P is measured as the power of IC to 1.8V white touch power supply is short-circuit, now it can be judged that 1.8V power supply short circuit pulled down the power of NAND and bus, removing the white touch chip, short circuit fault is solved now, welding jumper wire on black touch M1 and replace new chip.

Finally, assemble the iPhone, press the iPhone power button to test, now the iPhone can be boot smoothly and successfully.