IPhone 5 not powering after U2 changed - GSM-Forum

salvatore057 · 07-28-2015, 05:56

Dear all,
I have an iPhone 5 which battery was draining very fast until it stopped working after the battery was fully drained. When I inserted a new battery it started as normal.
I have decided to change the U2 IC after reading it may be the one leading to this issue but since it was replaced with a new one the phone is not powering on at all even with a new battery.
Could it be a bad U2 IC or a badly mounted U2 IC?
Would a missing U2 IC prevent the phone from starting?
Thanks a lot for your help

jackie8 · 07-28-2015, 15:08

what is the part number of your u2 ic ?

kaptanci · 07-28-2015, 20:00

Phone is not going to power on without u2. Or maybe u have shorted cpu.

salvatore057 · 07-28-2015, 20:30

Hi and thank you for the answers.
I will soon remove again the EMI shield and have a look at the U2 part number.
I start to think that the U2 IC is not soldered correctly, probably not enough heat was applied to melt the tin.
What I noticed is that the battery is not draining anymore. Before the U2 replacement the battery was draining also with the phone turned off.

shakil+ · 07-28-2015, 20:43

if u remove u2 mobile not gonna fully power on mobile sit with apply logo only
i think when u try remove u2 cpu get full hot now maybe cpu u have shorted cpu.

IPhone 5 not powering after U2 changed
Dear all,
I have an iPhone 5 which battery was draining very fast until it stopped WORKING after the battery was fully drained. When I inserted a new battery it started as normal.
I have decided to change the U2 IC after reading it may be the one leading to this issue but since it was replaced with a new one the phone is not powering on at all even with a new battery.
Could it be a bad U2 IC or a badly mounted U2 IC?
Would a missing U2 IC prevent the phone from starting?
Thanks a lot for your help

salvatore057 · 07-28-2015, 21:44

Hi shakil+, thank you for your answer. What I am surprised is that I do not have any voltage at the battery connector when the charger is plugged. It is like there is something missing on the charging circuit.
Would I have current at the battery connector when plugged to a charger with a dead CPU?
Thank you

salvatore057 · 07-29-2015, 19:49

Quote:

Originally Posted by jackie8

what is the part number of your u2 ic ?

Hi Jackie8, the part number is 1608a1.

idogsm · 07-31-2015, 15:48

Hi
this is the right one

Remove the U2 and turn on your phone without screen
Only by the power supply and see if it lights up
He needs to Ignite
If not start it is not the U2

idogsm

salvatore057 · 08-04-2015, 20:23

Quote:

Originally Posted by idogsm

Hi
this is the right one

Remove the U2 and turn on your phone without screen
Only by the power supply and see if it lights up
He needs to Ignite
If not start it is not the U2

idogsm

Hi, thanks for your reply I will try it as soon as I come back from holiday.

irzhan01 · 08-06-2015, 21:19

Quote:

Originally Posted by idogsm

Hi

this is the right one

Remove the U2 and turn on your phone without screen

Only by the power supply and see if it lights up

He needs to Ignite

If not start it is not the U2

idogsm

Hi ,
I have iphone 5 .. If im remove u2 is it can start with power supply ? I have one iphone 5 its loop apple logo

Sent from my iPhone using Tapatalk

Ionel · 08-06-2015, 21:34

Without u2 ic no phone will start , i try this .

irzhan01 · 08-06-2015, 21:37

U have trying ?? I think its start but only apple logo ...

Sent from my iPhone using Tapatalk

salvatore057 · 08-22-2015, 19:38

Dear all, I am back from holiday and I finally removed the U2 IC. The phone did not start without it but looking at the diagram of the component, I think that the phone cannot start without it.
If anyone can confirm it would be great.
I will install a new U2 IC but first I will have to rebuild some pads that I removed.
Thanks to everyone for your help.

irzhan01 · 08-23-2015, 04:04

Yeah iPhone 5 will not start if u2 removed .. I have tested too now i have missing some point there

I test replace u2 but no luck , and now im trying to repair mising pad there ..

Sent from my iPhone using Tapatalk

mb83 · 08-23-2015, 22:10

The upper one, near the cpu is for charging, it's critical, without it your phone will not charging anymore. The bottom one is mass so it is not important.

07-28-2015, 05:56	#1 (permalink)
salvatore057 Junior Member Join Date: May 2015 Posts: 24 Member: 2397540 Status: Offline Thanks Meter: 3	IPhone 5 not powering after U2 changed Dear all, I have an iPhone 5 which battery was draining very fast until it stopped working after the battery was fully drained. When I inserted a new battery it started as normal. I have decided to change the U2 IC after reading it may be the one leading to this issue but since it was replaced with a new one the phone is not powering on at all even with a new battery. Could it be a bad U2 IC or a badly mounted U2 IC? Would a missing U2 IC prevent the phone from starting? Thanks a lot for your help

07-31-2015, 15:48	#8 (permalink)
idogsm Freak Poster Join Date: Dec 2001 Location: israel Age: 69 Posts: 325 Member: 7994 Status: Offline Thanks Meter: 20	u2 Hi this is the right one Remove the U2 and turn on your phone without screen Only by the power supply and see if it lights up He needs to Ignite If not start it is not the U2 idogsm

07-28-2015, 15:08	#2 (permalink)
jackie8 Freak Poster Join Date: Jan 2014 Location: Germany Posts: 244 Member: 2105007 Status: Offline Thanks Meter: 40	what is the part number of your u2 ic ?

07-28-2015, 20:00	#3 (permalink)
kaptanci Freak Poster Join Date: Nov 2014 Location: Germany Posts: 265 Member: 2289832 Status: Offline Thanks Meter: 48	Phone is not going to power on without u2. Or maybe u have shorted cpu.

07-28-2015, 20:30	#4 (permalink)
salvatore057 Junior Member Join Date: May 2015 Posts: 24 Member: 2397540 Status: Offline Thanks Meter: 3	Hi and thank you for the answers. I will soon remove again the EMI shield and have a look at the U2 part number. I start to think that the U2 IC is not soldered correctly, probably not enough heat was applied to melt the tin. What I noticed is that the battery is not draining anymore. Before the U2 replacement the battery was draining also with the phone turned off.

07-28-2015, 20:43	#5 (permalink)
shakil+ Freak Poster Join Date: Jul 2013 Location: OMAN UAE Posts: 184 Member: 1982525 Status: Offline Sonork: 100.1619259 Thanks Meter: 45	if u remove u2 mobile not gonna fully power on mobile sit with apply logo only i think when u try remove u2 cpu get full hot now maybe cpu u have shorted cpu. IPhone 5 not powering after U2 changed Dear all, I have an iPhone 5 which battery was draining very fast until it stopped WORKING after the battery was fully drained. When I inserted a new battery it started as normal. I have decided to change the U2 IC after reading it may be the one leading to this issue but since it was replaced with a new one the phone is not powering on at all even with a new battery. Could it be a bad U2 IC or a badly mounted U2 IC? Would a missing U2 IC prevent the phone from starting? Thanks a lot for your help

07-28-2015, 21:44	#6 (permalink)
salvatore057 Junior Member Join Date: May 2015 Posts: 24 Member: 2397540 Status: Offline Thanks Meter: 3	Hi shakil+, thank you for your answer. What I am surprised is that I do not have any voltage at the battery connector when the charger is plugged. It is like there is something missing on the charging circuit. Would I have current at the battery connector when plugged to a charger with a dead CPU? Thank you

08-06-2015, 21:34	#11 (permalink)
Ionel No Life Poster Join Date: Sep 2004 Location: Romania Age: 42 Posts: 1,598 Member: 81232 Status: Offline Thanks Meter: 196	Without u2 ic no phone will start , i try this .

08-06-2015, 21:37	#12 (permalink)
irzhan01 Freak Poster Join Date: Oct 2014 Location: Indonesia Posts: 175 Member: 2281582 Status: Offline Thanks Meter: 26	U have trying ?? I think its start but only apple logo ... Sent from my iPhone using Tapatalk

08-22-2015, 19:38	#13 (permalink)
salvatore057 Junior Member Join Date: May 2015 Posts: 24 Member: 2397540 Status: Offline Thanks Meter: 3	Dear all, I am back from holiday and I finally removed the U2 IC. The phone did not start without it but looking at the diagram of the component, I think that the phone cannot start without it. If anyone can confirm it would be great. I will install a new U2 IC but first I will have to rebuild some pads that I removed. Thanks to everyone for your help.

08-23-2015, 04:04	#14 (permalink)
irzhan01 Freak Poster Join Date: Oct 2014 Location: Indonesia Posts: 175 Member: 2281582 Status: Offline Thanks Meter: 26	Yeah iPhone 5 will not start if u2 removed .. I have tested too now i have missing some point there I test replace u2 but no luck , and now im trying to repair mising pad there .. Sent from my iPhone using Tapatalk

08-23-2015, 22:10	#15 (permalink)
mb83 Freak Poster Join Date: Jun 2014 Posts: 400 Member: 2205919 Status: Offline Thanks Meter: 33	The upper one, near the cpu is for charging, it's critical, without it your phone will not charging anymore. The bottom one is mass so it is not important.