We repaired so many iPhone 7 and iPhone 7 Plus that having No Service problem.
|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.
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.|
- 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.
Last year i wrote an article about this repair.