This video tutorial is about how you can fix iPhone 7,7 plus 8 8plus searchings then no
service.
Cellular update failed message on the screen Let's check the IMEI number y typing *#06#.
Here must be the IMEI showing but not.
Let's check inside the setting Go to setting
Navigate to general Tap on about, scroll down
Here you can see IMEI shown but the modem firmware is blank means iPhone now fell to
get cellular network.
Let's see inside.
Power off iPhone Disconnect battery
Disconnect all flex.
Let's observe the PCB.
Pre repair sign The side metal bar is also torn.
The customer tells that the previous fault was the speaker grayed out go to the shop
for repair then such issues happen..
We found overheating while replacing audio ic causes such a problem.
So I remove the baseband chip.
Remove carefully it was near CPU and forcibly remove CPU cause broken.
If the BBCPU is broken then no option to fix for cellular.
BBCPU can’t be changed.
Reball BBCPU
Clean PCB carefully small parts near BBCPU might be broken loose or deform or important
Pad must be broken.
Clean all areas epoxy rosin may block from 4 sides.
While you put ic if the below pads are not good then you got a problem of ic not being
placed on the correct position.
Put some flux
Clean all pads with solder wick must be flat and shine.
Again put some flux
Put ic in the correct position.
Cooldown pc for 5 minutes
Let's check the PCB.
One important tip If you doing any hardware job then first always
use dc power supply the conform no any further problem then use battery on iPhone
Put PCB on the frame then power on here you can see no sim and IMEI shown on *#06#.
Inside the setting here you can see modem firmware.
Now insert sim and you can see network appears means problem fixed.
If that stuff is helpful and you have got some new ideas then share with friends.
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Hello, this is Akash, and peace out till the next time.