Skip to main content

Why iPhone 7P No Sound And Won’t Charge? – Fixed!


A customer sent us an iPhone 7 Plus to repair, the problem is that this iPhone 7P handset no sound, iPhone won't charge and iPhone camera won't take photos.  Why is that? The iPhone 7P was damaged from the dropped, so we suspect the iPhone motherboard is damaged. Now, we need to fix it. 


First, we need to fix the iPhone charge problem. 

Plug the iPhone lightning cable, we confirm the iPhone 7P is not charging. Connect iPhone 7P to the computer, the computer also can't identified the device. Now, we confirmed that iPhone 7P charge problem is caused by iPhone USB charge IC.

Remove the iPhone USB charge IC from the iPhone motherboard, use digital multimeter to measure the grounding resistance value of the solder point on the solder pad, we found the resistance value of the C3 is infinitely large, and this signal point is connected to the main audio IC via resistor R3104.

There are 3 kinds of possibilities for this case: first one is the resistor R3104 is damaged; second is the iPhone motherboard is pins dropped or disconnection; third is the iPhone audio IC is damaged. Put iPhone under the Trinocular Stereo Microscope to observe, remove the iPhone main audio IC, the pins is dropped, and circuit line is disconnected. Soldering jumper wire in this point, and replace the iPhone big audio IC. Now measure the resistance value of the USB IC C3 pin, the data is 480, which is normal value.


Now the charging current is 1.13A, the charge function is normal,  iPhone 7P won't charge problem has been solved.

Because of the iPhone audio IC pins dropped and disconnection, after soldering the pins and replace the iPhone main audio IC, the iPhone audio function is back to normal, so the iPhone handset no sound problem also has been solved.

Now we need to fix iPhone camera problem. Observe the iPhone camera, we found that was badly deformed. We decided to replace the new iPhone camera, after replacement,install the iPhone 7P, now the iPhone camera function is back to normal, so the iPhone camera won't take photos problem has been solved.

Test the other functions on iPhone, all works properly, the iPhone 7 Plus is back to normal work.  The repairs end!


Labels:

Comments

Post a Comment

Popular posts from this blog

User Manual: JC V1 Programmer to fix iPhone light sensor/vibrator

As we know, the light sensor and vibrator is very important for iPhone screen. If you want to replace the iPhone screen, you also need to transfer the original screen data to the new iPhone screen(iPhone 8 to iPhone Xs Max),so you can make sure the new iPhone screen will work fine. Here is a  JC V1 programmer  to fix iPhone light sensor and vibrator problem (for iPhone 7- iPhone Xs Max), it also can repair iPhone baseband eeprom IC or iPhone logic eeprom IC problem. The JC V1 Programmer comes with 24-inch HD display screen, three-color LED indicator light, two small connecting seats (for connecting function panel) , two buttons and one function panel (including light sensor/touch connector, baseband function connector, vibration connector) It support 2 languages (Chinese/English) and three lines of code (read/write/burn/save), the function panel can be changed, the software can automatically update What’s the functions? - Repair iPhone Light sensor/ true ...
1 comment
Read more

Essential tools for a phone repair technician Everyday Use

Must-Have tools for a phone repair technician include precision screwdrivers, spudgers, tweezers, suction cups, and heat guns or hair dryers. Additionally, anti-static mats and wrist straps are crucial for protecting sensitive electronics. Other helpful tools include a multimeter, soldering iron, magnifying lamp or microscope, and various cleaning supplies.  Whether you're a DIY enthusiast or a professional technician, having the right tools is crucial for successful phone repair. Here's a breakdown of common phone repair tools, categorized for clarity: I. Essential Opening and Disassembly Tools: Precision Screwdrivers : These are the most fundamental tools. Phones use tiny screws of various types (Phillips, Pentalobe, Torx, Flathead), so a comprehensive set with magnetic tips is highly recommended to avoid stripping screws and losing tiny parts. Spudgers ( Pry Tools ): Made of plastic or nylon, these non-conductive tools are invaluable for safely prying open phone casings...
Post a Comment
Read more

How to restore & unlock the apple watch series 1, 2, 3, 4, 5, and 6?

  Can you always remember your password? What should you do when there is a red exclamation error on your Apple watch after update you iWatch？6 IN 1   AWRT iBus   Tools, a professional Apple Watch recovery tool, enables you to unlock, repair and remove the exclamation error easily.   Why choose the AWRT iBus tool? Perhaps you would tell me Apple support team can solve the trouble. While they may help, you may not be patient enough because you want your watch fixed immediately. Moreover, you don't have to wait for too long for them to help you solve the issues. 1. This incredible device has an inbuilt original restore adapter for the apple watch of the series S1, S2, S3, S4, S5, and S6 42 mm and 38 mm /$199. There are also S1-just 38MM /$39.99, Adapter for S1-42mm 38mm /$139.99, or Adapter for S2 S3 - 42mm 38mm /$169.99 version for choosing. The tool requires professional Apple Watch Firmware  IPSW File  for iWatch S1-S6. 2. Moreover, the iBus tool has a lot...
Post a Comment
Read more