Iphone 4s REPAIR and solution - Page 3 - GSM-Forum

rabarba · 07-14-2012, 16:23

i have tried several times but cannot get it any cleaner than this.. could this be the solution why my screen is black? the background light seems to work (only visible in darkness) and phone is detected in itunes.. when it's connected to a charger it chimes every 5 seconds or so (the chime that sounds when charger is connected)... it's a water damaged phone

MUTUAL · 07-23-2012, 22:18

Quote:

Originally Posted by Wites

Not always in most cases error 28 come from crack in balls under Nand Flash mass memory.

Hi can u show me Nand Flash mass memory?

thonylvs · 07-24-2012, 07:51

i have got a iphone 4s with its the problem is network no service.
i also already changed the signal cable,but the problem still the same.
is that hardware problem? any short cut to fix this problem? thanks

khan6653 · 08-04-2012, 15:59

yeah i got same problem 4s with no signal , manually it shows carrier but no signal

Tickbrotha · 08-12-2012, 18:44

After replacing LCD, phone was stuck searching for signal (everything else works except Cellular)

I discovered that I broke U18_RF (AND GATE logic) while prying the battery up.

I found the part on Digikey for $1 but cannot solder SOT891 package ICs

Anyone have a recomendation on who can offer this serivces

SanjanMobile · 10-09-2012, 07:56

Quote:

Originally Posted by rabarba

i looked at this image and my three red connectors on that image are rusted. what can i do?

http://i47.tinypic.com/2lk40lh.jpg

this is my logic board

my 4s have same problem there is line cut all four connector socket

any one give us line jumper plz

picture have three burst connector my 4s have four busrts

plz help

mobileunlockers · 10-09-2012, 13:36

Quote:

Originally Posted by feverfones

thank you Mr Wites for your input
i have seen many useful post by you

iphone 4s black screen

hi mate

thanks for the solution, i got 4s here and F14 missing and there is no back light, can you please tell me if i can make a jumper

soybean · 10-21-2012, 23:17

Water damage iPhone4S, now stuck in DFU mode. iTunes just "wait for iPhone" forever during restore with apple logo and empty bar showing in iPhone display. I've tried clean the PCB with ultrasonic. Is it related to NAND IC? Anybody have solution for this case?

zildjian17 · 10-22-2012, 17:22

i have iphone 4s not powering on battery but when i put it on charge its powering on...automatically shut off when i remove the charger...any idea and solution?.....tnx

Intellligence · 10-24-2012, 14:11

Quote:

Originally Posted by zildjian17

i have iphone 4s not powering on battery but when i put it on charge its powering on...automatically shut off when i remove the charger...any idea and solution?.....tnx

I have exactly the problem, help to solve!

Battery changed, the result is the same, the problem is the motherboard.

soybean · 10-31-2012, 07:20

The problem fixed after remove C611. Here is the pic: iPhone 4 stuck in restore

Quote:

Originally Posted by soybean

Water damage iPhone4S, now stuck in DFU mode. iTunes just "wait for iPhone" forever during restore with apple logo and empty bar showing in iPhone display. I've tried clean the PCB with ultrasonic. Is it related to NAND IC? Anybody have solution for this case?

tarune10 · 12-27-2012, 12:21

i have a 4s, no sound in calls (both incoming and outgoing) pleas help, tried changing the headfone jack, charging jack but no luck. any solution plz

Levani_Pmic · 12-27-2012, 12:41

Quote:

Originally Posted by tarune10

i have a 4s, no sound in calls (both incoming and outgoing) pleas help, tried changing the headfone jack, charging jack but no luck. any solution plz

try friend ->reset all settings

emeritus roy · 01-01-2013, 16:50

anyone know on 4S board. next to bb chip (U2 RF) , -->C79_RF and FL2_RF <--
. what does this 2 do? and where can i find a replacement?

FL2_RF is corroded and removed.

maurphius · 02-07-2013, 22:24

Can anyone please tell me where to get the U18_rf ic for iphone logic board i am in india. Thanks a lot in advance

08-12-2012, 18:44	#35 (permalink)
Tickbrotha Junior Member Join Date: Jul 2005 Age: 33 Posts: 1 Member: 166332 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	Broken U18_RF After replacing LCD, phone was stuck searching for signal (everything else works except Cellular) I discovered that I broke U18_RF (AND GATE logic) while prying the battery up. I found the part on Digikey for $1 but cannot solder SOT891 package ICs Anyone have a recomendation on who can offer this serivces

01-01-2013, 16:50	#44 (permalink)
emeritus roy Junior Member Join Date: Aug 2011 Posts: 22 Member: 1644848 Status: Offline Thanks: 3 Thanked 3 Times in 2 Posts	hi anyone know on 4S board. next to bb chip (U2 RF) , -->C79_RF and FL2_RF <-- . what does this 2 do? and where can i find a replacement? FL2_RF is corroded and removed.

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07-14-2012, 16:23	#31 (permalink)
rabarba Junior Member Join Date: Jul 2012 Posts: 7 Member: 1784597 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	i have tried several times but cannot get it any cleaner than this.. could this be the solution why my screen is black? the background light seems to work (only visible in darkness) and phone is detected in itunes.. when it's connected to a charger it chimes every 5 seconds or so (the chime that sounds when charger is connected)... it's a water damaged phone

07-24-2012, 07:51	#33 (permalink)
thonylvs Junior Member Join Date: Mar 2007 Location: Malaysia Posts: 29 Member: 476621 Status: Offline Thanks: 6 Thanked 1 Time in 1 Post	i have got a iphone 4s with its the problem is network no service. i also already changed the signal cable,but the problem still the same. is that hardware problem? any short cut to fix this problem? thanks

08-04-2012, 15:59	#34 (permalink)
khan6653 Freak Poster Join Date: May 2008 Posts: 308 Member: 768977 Status: Offline Thanks: 0 Thanked 59 Times in 42 Posts	yeah i got same problem 4s with no signal , manually it shows carrier but no signal

10-21-2012, 23:17	#38 (permalink)
soybean Freak Poster Join Date: Aug 2004 Posts: 498 Member: 77254 Status: Offline Thanks: 7 Thanked 9 Times in 8 Posts	Water damage iPhone4S, now stuck in DFU mode. iTunes just "wait for iPhone" forever during restore with apple logo and empty bar showing in iPhone display. I've tried clean the PCB with ultrasonic. Is it related to NAND IC? Anybody have solution for this case?

10-22-2012, 17:22	#39 (permalink)
zildjian17 Junior Member Join Date: Aug 2008 Location: bur dubai, uae Posts: 7 Member: 834938 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	i have iphone 4s not powering on battery but when i put it on charge its powering on...automatically shut off when i remove the charger...any idea and solution?.....tnx

12-27-2012, 12:21	#42 (permalink)
tarune10 Junior Member Join Date: Dec 2010 Posts: 12 Member: 1478315 Status: Offline Thanks: 4 Thanked 2 Times in 2 Posts	i have a 4s, no sound in calls (both incoming and outgoing) pleas help, tried changing the headfone jack, charging jack but no luck. any solution plz

02-07-2013, 22:24	#45 (permalink)
maurphius Junior Member Join Date: Jun 2007 Posts: 4 Member: 524034 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	Can anyone please tell me where to get the U18_rf ic for iphone logic board i am in india. Thanks a lot in advance