Skip to main content

iPhone 6S doesn’t respond to boot—How to fix?


After pressing the iPhone power button, the iPhone 6S doesn't respond to boot, the iPhone screen keeps black.  Before the iPhone 6S got this problem, it works fine, after we charge it, the problem arises.  After plugging the iPhone lightning cable to charge it, the iPhone charging icon appears abnormally, after few seconds, the iPhone turns black.  How to fix this problem? 


Based on our repair experience, we suspected that it's the problem of the iPhone charge part. Open the WUXINJI Dongle to check iPhone 6S schematic diagram, we know that there are  three components are directly related to the charge part, they were Q2300, U2300 and U4500. Now we start to repair.

Disassemble the iPhone 6S, take out the iPhone motherboard. Measure the iPhone motherboard with DPS DC power supply, the boot current jumps from 200mA, it's abnormal, because the normal current should be around 40mA, it's short-circuited.

This phenomenon is mostly caused by the short circuit of the iPhone main power LDO power supply. 

After checking iPhone schematic diagram, we know that the PP3V0_TRISTAR and PP3V3_ACC this two are supplied by all LDO power supply, so the most likely damage is the USB U4500 IC. 

Use QUICK 861DW hot air rework station and tweezers to remove the USB IC, and then measure it again with DC power supply, the  boot current is about 40mA, then replace the iPhone USB charge IC. After replacement, measure the iPhone again, the current is normal. 


Install the iPhone 6S, now the iPhone has response when press the power button, and it entered the IOS successfully.  Charge the iPhone with iPhone lightning cable, it works properly. 



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

How to install K-TAG 7.003 KTM100 K-Suite 2.13 software

China Clone KTAG 7.003 firmware has newly launched, New2.13 KTM100 software is the replacement of 2.13 K-Suite which brings brand-new interface and makes easier operation. Here, vipprogrammer.com share the installation guide of K-TAG 7.003 K-Suite 2.13 software, this step-by-step instruction guide will help you. Software: KTM100 V2.13 (better than Ksuite software) Firmware: V7.003 Language:  English, Italian, Portuguese NOTE: KTM100 software can only be work with KTAG firmware V7.003 New KATG KTM100 V2.13 Firmware 7.003 new added feature: 1) New add BMW F chassis petrol and Mercedes-Benz W222 models 2) Software is much easier to use and is very stable. After you connect the car, just choose the large type, KTM100 will recognize the ECU detailed type via ID automatically. Disable both local network and wireless connection (Very important!!!) 1) Install KTAG KTM100 V2.13 setup Open KTM100 setup in the CD software on My computer Open KTM100 file, then open KTM100 English file...
Post a Comment
Read more

Install instructions for 2015.R1 autocom CDP Diagnosis software

2015.R1 autocom cdp software is available, 2015.1 autocom cdp software need to be activated by keygen, here, we share Install instructions for 2015.R1 autocom cdp software, help you how to crack autocom cdp software on you pc Tips: 1.) TURN OFF your internet connection! 2.) Shutdown antivirus software! The tutorial of Installing 2015.R1 autocom cdp Step 1: download autocom cdp software or insert the dvd to your pc. Step 2: pls download upgrade file for 2015.1 autocom cdp software, then copy all file and folder replace to autocom cdp(new vci) install Folder. Instructions for 2014.R1 autocom cdp Diagnosis software Step 3: Run autocom cdp software agian, the Activation menu will be showed, PLS DO IT by activation guide for 2013.R3 autocom cdp software. Step 4: Choose - click “YES” button to save autocom cdp FileActivation file, send this FileActivation.xml file to us (PLS DON’T USING 2013.3 Autocom delphi KEYGEN GET Activation FILE). Instructions for 2015.R1 autocom cdp Diagnosis softwar...
8 comments
Read more