FIXD: iPhone 7 Plus won't turn on Issue

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. Picture 10-1-1


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 WUXINJI Dongle 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. Picture 10-1-2


Reinstalling the iPhone NAND 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.


Tips: If you need more information and professional repair skilled, you want to consult, please check here. We'll give you a free answer. 

Comments

Post a Comment

Popular posts from this blog

My iPhone Got Wet! How To Fix iPhone Water Damage?

Image
 Water damage tends to worsen with time, and it is among the more challenging DIY repairs to undertake, so this guide covers the basic iPhone repair of water damage.  1. Remove iPhone from the water and Turn it off Remove your iPhone from the water as soon as safely possible. Minimize the length of time the iPhone and water are in contact to minimize corrosion. If your phone is still on when removed from the water, attempt to turn it off. If it's off, do not attempt to turn it on. 2. Check External Ports Check any external ports (charging port, headphone jack, SIM card slot, etc.) for corrosion as well. These may have to be cleaned out with alcohol and a  Anti Static Brush , or replaced if cleaning is not practical. Pay special attention to cable ends, battery contacts, connectors, pins, and fuses, as these parts are prone to corrosion and can easily cause the phone to malfunction. Test all the buttons and features (such as the microphone, s
Read more

2021 Latest MagicAWRT Adapter Restore Tool for Apple Watch

Image
 Here we have the latest MagicAWRT adapter Apple Watch restore tool in 2021, and MagicAWRT offers its complete solutions to fix many apple watch problems. MagicAWRT Adapter is intended for solving service problems with Apple Watch S0/SE/S1/S2/S3/S4/S5/S6 (38 mm / 42 mm / 40 mm / 44 mm). It can solve problems such as white apples, exclamation points, restarts, stuck on screens, poor touch, ID lock, etc. It also can fix related issues that are caused by  Apple Watch glass digitizer touch replacement. Apple Watch Firmware for MagicAWRT Adapter Restore Tool will not be provided, and the customer needs to download themselves. 1. Using MagicAWRT Adapter to reset Apple Watch Data with or without Backup MagicAWRT Recovery Adapter Restore Tool is the best iOS data restore software in the market because of its ease of use and attractive user interface. Most Apple Watch users data losses are due to accidents, failed jailbreaks, hardware and software failures, factory resets, and theft. It would
Read more

How To Solve iPhone X Voltage Jumping Issue

Image
Today, We getting the iPhone X main board 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
Read more