Skip to main content

Solved: iPhone 6S fingerprint function abnormal (no response or can’t add new)

The iPhone 6S fingerprint function is abnormal,  it can't add new fingerprint or fingerprint no response.  The iPhone home button failure or iPhone circuit line failure all will cause this issue. 


Check circuit diagram of iPhone 6S fingerprint line interface on WUXINJI Dongle, the difference with iPhone 6 is that the iPhone 6S has more circuit. The left of the fingerprint line interface circuit map is control signal of fingerprint; the right part is new function--Force Touch, also called pressure feeling control.

According the iPhone schematic diagram, we know that the power supply of fingerprint has 3 circuits, one is 1.8V, one is 3.0V and another one is 16.5V. If the 1.8V and 3.0V is abnormal, it cause fingerprint failed to turn on, these two voltages can be reached to fingerprint interface when you press the iPhone power button.

The voltage of 3.0V and 1.8V is supplied from iPhone power IC. If the circuit of 16.5V is abnormal, it will cause the iPhone can open the button that adds fingerprints, but there is no response when you add fingerprint. This voltage will be measured 16.5V when the fingerprint is opened and the iPhone Home button is touched by the finger.

If a fingerprint addition failure occurs, firstly use Fluke 15B+ Digital Multimeter to measure the iPhone to confirm whether there is 1.8V and 3.0V. If none of 3.0V or 1.8V, then measure whether there is a short-circuit phenomenon in this circuit. If short circuit phenomenon exists, then use rosin method to find the short circuit components. If it is open circuit or the resistance is normal but without voltage, check short connection FL4100 FL4105, re-install or replace the iPhone power IC.

If the 3.0V and 1.8V voltage all is normal, but it prompts for failure when you add a fingerprint, check the diode data of interface 7/9/15/17/19. If it's open circuit, check the short connection and capacitor FL4110 R4111 FL4112 R4115 R4116, you can short connect it. If it is the iPhone home button fails, check short connection R4117.

If add a fingerprint without prompting for a failure, but there is no response when touching the home button with a hand, open the iPhone fingerprint function, click add fingerprint, when you touch the home button with your finger, measure the voltage whether is about 16.5V. If not, check short connection FL1407, and then use hot air gun and tweezers to replace U4040.





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 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