Saturday, February 16, 2019

iPhone 7 / 7 Plus No Service

We repaired so many iPhone 7 and iPhone 7 Plus that having No Service problem.

iPhone 7 Plus No Service
If you try to restore it, you will ended up like this. Unable to activate the iPhone.
When you stuck in this menu,
Click the "!" exclamation mark at bottom right.
You can see there is only Serial Number, and No IMEI. Then it's confirmed you have hardware problem.

This problem we called it "baseband" problem


Baseband iPhone 7
The same iPhone above is repaired.
A normal working iPhone would be like this. MEID, SN, and IMEI.


Why can't activate?
Because Apple need to verify is the device Serial Number and IMEI number match with their server or not. Server won't let you activate if S/N or IMEI missing or not match with their list.

Why No Service?
It is motherboard issue that one of chipset called Baseband is not working.

Why baseband is not working?
Baseband power circuit shorted due water damaged.
or
Solder joint broken caused by heavy drop but 
problem won't occur immediately, usually happen later.
Red circle is Baseband ic. To repair this, the technician must be very well trained. If not, it will killed the A10 CPU on beside due overheat causing unable to power on.
Solution and price?Sorry, we must need to open up and check before repair or quote you a price. Because it can be many reasons causing baseband failure.
  • Some are just need reball and rebuild the broken tracks/pads.
  • Some are shorted BB PMU (baseband power ic) or components around it. 
  • Some are because some shop attempted to repair other problem but created this problem. We need to repair their mess.
So the price is vary. We need to check first.

Last year i wrote an article about this repair.