Iphone 7 Boot loop - GSM-Forum

Pepisanone · 10-08-2017, 14:51

Hello Guys,
I came across a series of problems with an Iphone I recently purchased.
Well, I repair Iphones, but only the simple stuff.

So i bought this Iphone 7 that had a shattered screen and that was lagging and had an issue with the home button. Homebutton is clicking multiple times when you click it. Except that, it works fine.

I updated to Ios11 and boom...boot loop. I dug around and replaced some ribbon cables, displays, did some recoveries and found out that it would only boot up when I leave the proximity flex unplugged. It will take about 5 minutes to boot, but eventually it comes back to life.
Another thing I discovered is that voice record was not working. I read somewhere that this could indicate a PCB problem.
Next thing was the freezing. It works like a champ and lag free until i try to open an app, does not matter which. It will freeze for a few seconds.

I also found out that the guy i bought it from tried to repair it himself, lost some screws and the flex brackets.

Well, I hope that some of you guys can help me. I really hit a wall here.

fenix50 · 10-08-2017, 21:41

Back to iOS 10.3.3 and try

Pepisanone · 10-09-2017, 05:26

isn't that impossible, since apple stopped signing ios10?

ProfesseurLouis · 10-09-2017, 11:18

Yea, impossible to return to 10.3.3 now :/

- Try an other LCD (if you have an OEM screen restore the phone with this screen attached)
- Voice recording problem and freezing may also be a audio IC issue. You'll have to check this chip located at the back on the motherboard, near the Nand chip. Reheat for 1 minute, try. If it works, reball or change the audio IC.

luongwj · 10-13-2017, 03:42

Thanks for guiding ProfesseurLouis, I'll give it a shot

karmellino · 03-23-2018, 08:46

If someone else have similar issue I give you the solution of this problem https://www.youtube.com/watch?v=bQMaqHXGlO8&t=339s

johny_gsm · 08-30-2018, 09:41

Good video guide where can I find more useful videos like this?

eselekt · 09-27-2018, 06:43

Here is a useful playlist with only iPhone repairs, you can learn from it:

https://www.youtube.com/playlist?lis...MYkLalUJQkbDnA

chowchinshung · 09-28-2018, 08:27

FLASH WITH iOS 12 WITH ITUNES LATEST VERSION

arja18 · 09-29-2018, 06:22

I have tried to flash it but still nothing has changed. I will try to solder this time.

Wysłane z mojego HTC One mini przy użyciu Tapatalka

milek12 · 10-02-2018, 09:25

You need to downloar the uptodate software, other way you get that bug

dpafetti · 10-10-2018, 17:51

Boot loop is related to the audio IC issue. Reballing it

10-08-2017, 14:51	#1 (permalink)
Pepisanone Junior Member Join Date: Oct 2017 Posts: 2 Member: 2765867 Status: Offline Thanks Meter: 0	Iphone 7 Boot loop Hello Guys, I came across a series of problems with an Iphone I recently purchased. Well, I repair Iphones, but only the simple stuff. So i bought this Iphone 7 that had a shattered screen and that was lagging and had an issue with the home button. Homebutton is clicking multiple times when you click it. Except that, it works fine. I updated to Ios11 and boom...boot loop. I dug around and replaced some ribbon cables, displays, did some recoveries and found out that it would only boot up when I leave the proximity flex unplugged. It will take about 5 minutes to boot, but eventually it comes back to life. Another thing I discovered is that voice record was not working. I read somewhere that this could indicate a PCB problem. Next thing was the freezing. It works like a champ and lag free until i try to open an app, does not matter which. It will freeze for a few seconds. I also found out that the guy i bought it from tried to repair it himself, lost some screws and the flex brackets. Well, I hope that some of you guys can help me. I really hit a wall here.

10-08-2017, 21:41	#2 (permalink)
fenix50 Junior Member Join Date: Dec 2015 Location: Switzerland Posts: 17 Member: 2503190 Status: Offline Thanks Meter: 4	Back to iOS 10.3.3 and try

10-09-2017, 05:26	#3 (permalink)
Pepisanone Junior Member Join Date: Oct 2017 Posts: 2 Member: 2765867 Status: Offline Thanks Meter: 0	isn't that impossible, since apple stopped signing ios10?

10-09-2017, 11:18	#4 (permalink)
ProfesseurLouis Junior Member Join Date: Oct 2017 Posts: 10 Member: 2765861 Status: Offline Thanks Meter: 6	Yea, impossible to return to 10.3.3 now :/ - Try an other LCD (if you have an OEM screen restore the phone with this screen attached) - Voice recording problem and freezing may also be a audio IC issue. You'll have to check this chip located at the back on the motherboard, near the Nand chip. Reheat for 1 minute, try. If it works, reball or change the audio IC.

10-13-2017, 03:42	#5 (permalink)
luongwj Junior Member Join Date: Oct 2017 Posts: 13 Member: 2766741 Status: Offline Thanks Meter: 1	Thanks for guiding ProfesseurLouis, I'll give it a shot

03-23-2018, 08:46	#6 (permalink)
karmellino Freak Poster Join Date: Feb 2011 Posts: 124 Member: 1518920 Status: Offline Thanks Meter: 16	If someone else have similar issue I give you the solution of this problem https://www.youtube.com/watch?v=bQMaqHXGlO8&t=339s

08-30-2018, 09:41	#7 (permalink)
johny_gsm Junior Member Join Date: May 2018 Posts: 35 Member: 2837953 Status: Offline Thanks Meter: 1	Good video guide where can I find more useful videos like this?

09-27-2018, 06:43	#8 (permalink)
eselekt No Life Poster Join Date: Sep 2016 Posts: 506 Member: 2621291 Status: Offline Thanks Meter: 124	Here is a useful playlist with only iPhone repairs, you can learn from it: https://www.youtube.com/playlist?lis...MYkLalUJQkbDnA

09-28-2018, 08:27	#9 (permalink)
chowchinshung Junior Member Join Date: Sep 2018 Posts: 10 Member: 2866139 Status: Offline Thanks Meter: 2	FLASH WITH iOS 12 WITH ITUNES LATEST VERSION

09-29-2018, 06:22	#10 (permalink)
arja18 Crazy Poster Join Date: Sep 2017 Location: Philippines / Manila Posts: 51 Member: 2757196 Status: Offline Thanks Meter: 3	I have tried to flash it but still nothing has changed. I will try to solder this time. Wysłane z mojego HTC One mini przy użyciu Tapatalka

10-02-2018, 09:25	#11 (permalink)
milek12 Freak Poster Join Date: Aug 2017 Posts: 131 Member: 2748073 Status: Offline Thanks Meter: 8	You need to downloar the uptodate software, other way you get that bug

10-10-2018, 17:51	#12 (permalink)
dpafetti Junior Member Join Date: Feb 2018 Posts: 13 Member: 2813930 Status: Offline Thanks Meter: 9	Boot loop is related to the audio IC issue. Reballing it