Iphone 4 water damaged only DFU mode?? - GSM-Forum

iCall · 06-29-2012, 12:36

I have water damaged iphone 4 (upper part only)> after clean it fail into DFU mode and never get out since. Restore error 1601, 1602 after stuck on "Prepairing iphone restore.." little bit long time. Redsnow says USB communication problem. Not be hot anywhere except USB connector sometimes. is it CPU A4 problem or NAND? Any solution please? Thank you very much

tauheed9 · 06-29-2012, 12:49

give apple service centre to solve ur problem

iCall · 06-29-2012, 17:10

Quote:

Originally Posted by tauheed9

give apple service centre to solve ur problem

This is not solution guy! Master Wites please help?!

siyahhh · 06-30-2012, 13:11

i have same problem hlp pls

seve91 · 06-30-2012, 15:16

99% is A4 CPU...try to give 10 min on ultrasonic cleaner, it should be ok!
NAND IC has very big pads and a great distance between the pads, it is very difficult that they short.
But A4 has 2 layers, CPU+RAM balls 0.3, so it could be the guilty

seve91 · 06-30-2012, 15:19

and try to measure across the caps if they are shorted or not, the big one near the NAND IC and the caps around the A4 CPU, expecially on the left...if they are shorted, you know for sure where the problem is

iCall · 07-13-2012, 13:25

Hi guys,
the one in DFU mode: I found C221 = 0.3V instead of 1.2V (PP1V2_SDRAM) in another working circuit board, is it rite in DFU mode or any related U7? see pic

and other side of DFU board:
L2_RF : 0V and C50_RF = 0V also? is it rite in DFU mode or any experience please? Thank you

seve91 · 07-13-2012, 14:17

sorry mate LOL a L is an inductor, is a wire, how can you think to have a voltage across it? lol
you should measure resitance across that major bypass caps to see if they are shorted or not. When you'll find the shorted cap, you know where is the problem.
CAP SHORTED ---> PROBLEM!
INDUCTOR OPEN ---> PROBLEM!
My advice is to clean it at least 10 min in ultrasonic cleaner before try any solution

iCall · 07-13-2012, 15:13

Sorry I thought you knew all. Of course I know what is L and if L2_RF has volt or not in working board as well. Please check again. Thus when I mentioned about these meant I need to know what cause it or DFU causes it.

seve91 · 07-13-2012, 15:50

i know mate, but that is my method...check if caps are shorted or inductors are opened (in all the whole board, but expecially around A4 and PMIC). When you find the problem, you'll find also the BGA responsible of DFU damage

L2_RF will always have 0V across it, but you need to check resistance, if beep ok, if not is bad, means that the coil is interrupted somewhere

Check also if PMIC or other BGA is being hot

iCall · 07-13-2012, 18:05

I don't think you're rite. Have you checked L2_RF? Let me tell what I tested:
Working logic board:
In working mode: L2_RF = 1.2V same voltage to C50_RF; L3_RF = 1.8V
When put it into DFU mode: all 0V; 0V
Could not measure C221
DFU faulty logic board:
L2_RF = 0V but L3_RF = 1.2V??
As in the first post, not get hot anywhere

marabou · 08-10-2012, 15:35

i phone 4 water damage upper area,change the poweflex

rr · 08-10-2012, 22:10

to iCall: check caps, double. some off them shorted . something wrong around power controller .check vbat caps.

iCall · 08-11-2012, 02:58

Quote:

Originally Posted by rr

to iCall: check caps, double. some off them shorted . something wrong around power controller .check vbat caps.

Thank you anyway but it's late now

. removed A4 and waiting for new one

DjDecibel · 09-29-2012, 23:52

hello, i have identical problem.. just after a rehot.. did you solved somehow?

06-29-2012, 12:36	#1 (permalink)
iCall Freak Poster Join Date: Dec 2010 Posts: 143 Member: 1477098 Status: Offline Thanks: 16 Thanked 10 Times in 9 Posts	Iphone 4 water damaged only DFU mode?? I have water damaged iphone 4 (upper part only)> after clean it fail into DFU mode and never get out since. Restore error 1601, 1602 after stuck on "Prepairing iphone restore.." little bit long time. Redsnow says USB communication problem. Not be hot anywhere except USB connector sometimes. is it CPU A4 problem or NAND? Any solution please? Thank you very much

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06-29-2012, 12:49	#2 (permalink)
tauheed9 Product Supporter Join Date: May 2012 Location: mahim mumbai Age: 21 Posts: 1,215 Member: 1761678 Status: Offline Sonork: 100.1615439 Thanks: 151 Thanked 177 Times in 126 Posts	give apple service centre to solve ur problem

06-30-2012, 13:11	#4 (permalink)
siyahhh Freak Poster Join Date: Feb 2006 Location: netherland Age: 28 Posts: 217 Member: 228579 Status: Offline Sonork: 100.1612511 Thanks: 11 Thanked 70 Times in 56 Posts	i have same problem hlp pls

06-30-2012, 15:16	#5 (permalink)
seve91 Freak Poster Join Date: Mar 2012 Location: Italy Posts: 207 Member: 1741592 Status: Offline Thanks: 42 Thanked 27 Times in 21 Posts	99% is A4 CPU...try to give 10 min on ultrasonic cleaner, it should be ok! NAND IC has very big pads and a great distance between the pads, it is very difficult that they short. But A4 has 2 layers, CPU+RAM balls 0.3, so it could be the guilty

06-30-2012, 15:19	#6 (permalink)
seve91 Freak Poster Join Date: Mar 2012 Location: Italy Posts: 207 Member: 1741592 Status: Offline Thanks: 42 Thanked 27 Times in 21 Posts	and try to measure across the caps if they are shorted or not, the big one near the NAND IC and the caps around the A4 CPU, expecially on the left...if they are shorted, you know for sure where the problem is

07-13-2012, 13:25	#7 (permalink)
iCall Freak Poster Join Date: Dec 2010 Posts: 143 Member: 1477098 Status: Offline Thanks: 16 Thanked 10 Times in 9 Posts	Hi guys, the one in DFU mode: I found C221 = 0.3V instead of 1.2V (PP1V2_SDRAM) in another working circuit board, is it rite in DFU mode or any related U7? see pic and other side of DFU board: L2_RF : 0V and C50_RF = 0V also? is it rite in DFU mode or any experience please? Thank you

07-13-2012, 14:17	#8 (permalink)
seve91 Freak Poster Join Date: Mar 2012 Location: Italy Posts: 207 Member: 1741592 Status: Offline Thanks: 42 Thanked 27 Times in 21 Posts	sorry mate LOL a L is an inductor, is a wire, how can you think to have a voltage across it? lol you should measure resitance across that major bypass caps to see if they are shorted or not. When you'll find the shorted cap, you know where is the problem. CAP SHORTED ---> PROBLEM! INDUCTOR OPEN ---> PROBLEM! My advice is to clean it at least 10 min in ultrasonic cleaner before try any solution

07-13-2012, 15:13	#9 (permalink)
iCall Freak Poster Join Date: Dec 2010 Posts: 143 Member: 1477098 Status: Offline Thanks: 16 Thanked 10 Times in 9 Posts	Sorry I thought you knew all. Of course I know what is L and if L2_RF has volt or not in working board as well. Please check again. Thus when I mentioned about these meant I need to know what cause it or DFU causes it.

07-13-2012, 15:50	#10 (permalink)
seve91 Freak Poster Join Date: Mar 2012 Location: Italy Posts: 207 Member: 1741592 Status: Offline Thanks: 42 Thanked 27 Times in 21 Posts	i know mate, but that is my method...check if caps are shorted or inductors are opened (in all the whole board, but expecially around A4 and PMIC). When you find the problem, you'll find also the BGA responsible of DFU damage L2_RF will always have 0V across it, but you need to check resistance, if beep ok, if not is bad, means that the coil is interrupted somewhere Check also if PMIC or other BGA is being hot

07-13-2012, 18:05	#11 (permalink)
iCall Freak Poster Join Date: Dec 2010 Posts: 143 Member: 1477098 Status: Offline Thanks: 16 Thanked 10 Times in 9 Posts	I don't think you're rite. Have you checked L2_RF? Let me tell what I tested: Working logic board: In working mode: L2_RF = 1.2V same voltage to C50_RF; L3_RF = 1.8V When put it into DFU mode: all 0V; 0V Could not measure C221 DFU faulty logic board: L2_RF = 0V but L3_RF = 1.2V?? As in the first post, not get hot anywhere

08-10-2012, 15:35	#12 (permalink)
marabou Junior Member Join Date: Sep 2010 Posts: 4 Member: 1403094 Status: Offline Sonork: marabou Thanks: 0 Thanked 0 Times in 0 Posts	i phone 4 water damage upper area,change the poweflex

08-10-2012, 22:10	#13 (permalink)
rr Crazy Poster Join Date: Dec 1999 Posts: 55 Member: 799 Status: Offline Thanks: 18 Thanked 2 Times in 1 Post	to iCall: check caps, double. some off them shorted . something wrong around power controller .check vbat caps.

09-29-2012, 23:52	#15 (permalink)
DjDecibel Freak Poster Join Date: Sep 2006 Location: Southern Italy Posts: 228 Member: 343635 Status: Offline Thanks: 32 Thanked 57 Times in 30 Posts	hello, i have identical problem.. just after a rehot.. did you solved somehow?