Repir Guide: IPhone 6S Retains Signal After Removing SIM Card

Last week, the customer sent us an iPhone 6S. His iPhone 6s read the card after booting and retained the signal after removing the SIM card. He needs us to repair it.



Based on our past repair experience.This situation can be divided into three kinds of faults:
1. Abnormal card holder;
2. Card detection pin problem;
3. The baseband signal part problem.
Let's confirm the fault first.

Install the iPhone to test, we found that as the customer said, there is still a signal even if the SIM card was pulled out. According to previous maintenance experience, first we use FLUKE digital multimeter to check the resistance of each pin of the card base, especially the resistance of the card detection pin (that is, the card switch).

After measuring, it is found that the card detection pin has no resistance value. At the other end of the R3401, the resistance can be measured, and the fault is determined in the card detection pin, which is broken.

Solution: you can use jumper wire to connect directly to the card detection pin without removing the card holder.



Connect R3401 to the eighth pin of J3001.

The operation is shown under Trinocular Stereo Microscope as the following picture:



Reinstall to test, the fault is fixed well now!

If you have any suggestions or questions about mobile phone repair, please contact us at www.vipfixphone.com.

评论

发表评论

此博客中的热门博文

How to install 2015.R3 Delphi DS150E Software

图片
More and more people want to install / activate 2015.R3 Delphi DS15OE Software , but few of people know how to operate. So Today I will teach you some way to solve the problem. Firstly, you should prepare some work, such as: -TURN OFF your internet connection! -Shut down antivirus software! -Delete all files about the old version! Then, you can start ceremonial work, and you can follow my step to complete. Step 1: copy "CARS 2015.R3 " or "Trucks 2015.R3" to your computer. Step 2: run main.exe in "CARS 2015.R3" to activate（if you want to install truck ,please run main.exe in " Trucks 2015.R3 ") - click start - click yes to save FileActivation on desk - use the 2015.3 keygen to active FileActivation - click start again - click no to open the FileActivation actived - wait for install complete,enjoy! If you cnn't run the 2015.3 keygen, please install [net-frame 4.0] from google. If you want to attempt you can try vipprogrammer...
阅读全文

New product introduction: JC V1 programmer repair iPhone light sensor and vibrator

图片
Today, we will introduce a new product: JC V1 Programmer, whose main function is to repair iPhone light sensors, touch and vibrators. JC V1 programmers support iPhone 7 to iPhone Xs Max, whose main function is to read, write and restore iPhone light sensors, touch and vibrator data. Do you want to know how to use this device? Please continue reading JC V1 programmer main features 1. 24-inch HD display 2. Tri-color LED indicator 3. Two small connectors (for connecting function panels) 4. A function panel (including light sensor / touch connector, baseband function connector, vibration connector) 5. Support 2 languages (Chinese / English) 6. Support for changing the function panel 7. Software update (automatic) 8. Support for three lines of code (read/write/burn/save) JC V1 Programmer Specific functions - Repair iPhone Light sensor/ true tone function (iPhone 7- iPhone Xs Max) - Repair iPhone touch vibrator function (iPhone 7- iPhone Xs Max) - Read/Write iPhone l...
阅读全文

How to repair iPhone 8 stuck on Apple logo

图片
We got an iPhone 8 from a customer and his iPhone 8 card was on the White Apple and could not be opened. What caused it? How to fix this fault? Open the iPhone and the Apple logo displays normally. However, the phone card is on the Apple logo and cannot be fully activated. Connect your phone to your computer and recover from iTunes. Then insert the SIM card and activate your phone. The Home Button gets unresponsive with returning function and the phone fails to activate completely. Disassemble the phone with iPhone opening tool kit(VC862) and disconnect the battery. Then remove the display assembly. Use digital multimeter to measure the power supply voltage of Home Button. The measured voltage value is 3.3V, 1.8V and 2.75V. Normal voltage value for the three are normal. Then, remove the Home button and check if the iPhone fingerprint flex cable is damaged, in fact it is in a normal state. To further confirm the fault point, we replace with a new display assembly. Get the...
阅读全文