Skip to main content

Solved: iPhone 7 Plus won't turn on disease

Our customer sent an iPhone 7 Plus to us, the problem is that the iPhone 7 Plus won't turn on. He wants us to fix it.



Trouble phenomenon

The original problem with this iPhone 7 Plus is that the iPhone touch screen shows half bright half black after the boot, when repaired this problem, the iPhone 7 Plus won't turn on.

Repair process

After we received the iPhone 7 Plus, first of all, we need to use JM-P01 Essential Toolkit to disassemble the iPhone, remove the iPhone motherboard and then put observe it under the VGA Camera 7-45X Trinocular Stereo Microscope, there has traces of water, and many small original components have been torn down.


Connect iPhone motherboard to the computer with C48 MFI USB Cable, there is no response. With the help of YH898D hot air gun and tweezers, we remove the iPhone NAND Flash, and then connect it to computer again, still no response.

Use Fluke 15B+ Digital Multimeter to measure the booting power supply and I2C bus, the data is normal. Now we start checking the disconnected iPhone NAND flash that without connecting to the computer. Remove USB tube U4001, measure the resistance of the substrate, we found the E4#(PMU-AOP-TRISTAR-ACTIVE-READY) is short circuit.

Open the WUXINJIDongle to check the iPhone schematic diagram; We can know that this point is connected to the CPU display IC U3703 C2#. So we remove the U3703, and then measure the C2# and U4001 E4# again, the short circuit fault has been resolved.



Reinstalling the iPhoneNAND Flash and U4001, and replace a good U3703, after finish these, assemble the iPhone to test, the iPhone 7 Plus turned on smoothly, the fault was solved.
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