Skip to main content

Solved: iPhone 8 Plus no service after insert SIM card

We've received an iPhone 8 Plus from our customer, the problem is that the iPhone 8P dropped before, and then the iPhone 8P is no service after insert the SIM card, if we don't insert the SIM card, the iPhone always prompts "no SIM card Installed".

For a dropped iPhone, mostly the iPhone solder pad pins are missing, or the iPhone is short-circuited by dropping. The iPhone 8 plus was dropped before, so we suspect that the solder pads are off the pins.

After disassemble the iPhone by phone opening tools, we found the iPhone has been repaired by other repair man, the DSM_LB_E and DSM_HB_E chips on the iPhone motherboard had been removed.


Use Fluke 15B+ Digital Multimeter to measure the diode data for iPhone solder pad, we found the SCLK_HB_LB_DSM_FILT_E signal for the DSM_LB_E and DSM_HB_E IC is short-circuited.

Open the WUXINJI Dongle to check iPhone schematic diagram and bitmap, we found the previous repair man installed the R1608_E resistor in the C1602_E capacitor position, the position of the C1602_E capacitance on the schematic diagram is not installed.


Use tweezers to remove the resistance on the C1602_E capacitor position, and then use QUICK 861DW to solder it to the original place, solder the jumper wire to the missing pins on the solder pad, and welded the component chips. Now install the iPhone and test it, but the problem still there.

Disassemble the iPhone, observe the iPhone motherboard under the 3D Digital Microscope, comparing with the iPhone schematic diagram, we found the FL1501_E inductance missing, but it's installed on the schematics diagram.


Connect the missing inductor directly，and then turn on the iPhone to test.


Now the signal is normal after insert the SIM card, and the phone call is normal, the repairs end.


This failure is caused by missing pins on solder pad and dropped components.
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

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