Skip to main content

Repair iPhone 7/7P signal part （3 cases and solutions）

Today, we are going to talk about iPhone 7 7 Plus no signal issues. Actually, if your iPhone 7/7P shows no signal, then you can't make the phone calls or sent messages. Unless your iPhone 7/7P is in WiFi coverage, otherwise the iPhone won't be able to contact with others. Here are three types of no signal issues and related solutions.


1. iPhone 7/7P has no signal at all, infinite search

Get into IOS, go to Settings>- General>- About to check whether there is the IMEI.

If the IMEI is not displayed on this iPhone, then you need connect iPhone to DC power supply to check iPhone boot current, and then determine if it has a large current issue. If there is a phenomenon of leakage, then you can fix it with leakage methods; if the current is normal, then you can directly replace the baseband power without test, and then re-install the iPhone baseband CPU.

If IMEI is displayed on the iPhone normally, then set up the time （WiFi Automatic settings available）， enter the Dial-up interface, press *#06# to see if the IMEI can be displayed. If IMEI can't be displayed, then you need to use hot air gun and tweezers to replace Power Amplifier IC-QPOET_RF, and replace baseband power BBPMU_RF, re-install the baseband CPU--BB_FR, replace LBPA_RF, replace MHBDSM_RF.

2. iPhone 7/7P has no signal at all, try different SIM card

Press *#06# and the IMEI can be displayed normally, and then you can try insert different SIM card to check. If you insert any SIM card, it still shows no signal, and then you can check the antenna under the Trinocular Stereo Microscope, and then replace it, replace MF IC and Power Amplifier IC-QPOET_RF.

3. Some damaged IC will cause different SIM card has no signal

It is noteworthy that if system under the hardware abnormal case, then the 4G function will be auto close. If there is no 4G or even you fixed the hardware, but still no 4G, you can erase all the data and then restore settings.

The following IC damage will cause the iPhone 7/7P no signal（you can check it on WUXINJI Dongle）:

XCVR1_RF （CDMA and WCDMA receive）
MHBDSM_RF
GSMPA_RF2G Amplifier

MBHBPA_RF Amplifier

Comments

Post a Comment

Popular posts from this blog

Complete Guide to Replacing Your iPhone Battery at Home

  Has your iPhone battery started showing the dreaded signs of age, like frequent charging, rapid draining, or even an untimely shutdown? Are you considering a battery replacement but feeling deterred by the potential cost or hassle of a trip to the Apple Store? Don't worry; with the right guidance, you can replace your iPhone battery at home quickly and safely, sparing your wallet and ensuring a future of longer charge cycles for your beloved device. Whether you have the latest model or an older version, we'll walk you through the process step by step. But before we get into the nitty-gritty, here's why a battery replacement might be in your best interest. Why You Should Replace Your iPhone Battery The lithium-ion batteries in our smartphones are not immortal. They degrade over time due to a variety of factors, such as age, temperature, and the number of charge cycles. Replacing an old battery can provide several benefits: Improved Performance: A new battery can result ...
Post a Comment
Read more

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

Here: JC P11 iPhone Nand Test Fixture Specification Details

JC P11 iPhone Nand test fixture is on sale now, some users still confused for it, what's credit points for JC P11? Why it's cheap? As we know, JC P11 BGA110 programmer is the latest programmer for iPhone   iPhone XS Max,XS, X, 8P, 8  and iPhone 11 Pro max/pro/11, which is made by JCID factory.  Here are some  specification details for JC P11 programmer . 1. Main Functions. - Support to modify and write BGA110 NAND SYSCFG data (NAND Flash underlying data, such as SN/BT/WIFI and others); Unbind WIFI. - It doesn't require restoring the firmware for brand-new Nand flash, the SYSCFG data can be written directly. - Repair the Error 35 during firmware restoring for BGA110 NAND - Repair the DATA Error for BGA110 NAND - Support iPhone 8/8P/X/XS/XS Max currently, free software upgrade to support 11-11Pro Max in the future - Initiate the network charging mode, can purchase the points according to the demand, which greatly saves the equipmen...
Post a Comment
Read more