iPhone 3G keeps losing signal/service

Question

iPhone 3G

Zweite iPhone Generation. Modell A1241 mit 8 oder 16 GB Kapazität und schwarzer oder weißer Kunststoff-Rückseite. Die Reparatur ist leichter zu bewerkstelligen als beim iPhone 1. Es werden Schraubendreher, Hebelwerkzeuge und Saugnäpfe benötigt.

1158 Fragen Alle anzeigen

rousp @rousp

Rep: 6,6 Tsd.

19

14

10

Veröffentlicht: 5. Jul 2010

Einstellungen

iPhone 3G keeps losing signal/service

iPhone 3G loses signal randomly and for no obvious reason, everything else works just fine.

Until a few days ago the phone has never been dropped. Then it was dropped from about 1 meter, twice...
The phone is just over 1 year old

Waiting
- Nothing..
Rebooting
- Brings service back for a while
Activating and deactivating flight mode
- Brings service back for a while
Re-seating sim-card
- Brought back service initially, but didn't solve problem

Loose cable?
- I don't see how that fits in. I mean, re-booting gets the service back. If it was a loose cable it shouldn't help to re-boot..
??
My observations indicate that the phone is only ever on 3G network. Could the problem be in or around the UMTS chip?
- Considering logic board replacement or contacting someone doing BGA soldering.

Yesterday I changed the whole dock assembly to see if that could fix the problem.

Today it lost connection again. So it didn't work.

Now I'm considering to get a new iPhone or doing a logicboard replacement on this one.. Also I could find someone local that does BGA soldering and ask them to find the chip that has to be loose on the logicboard...

Either that or I'll decide that I can't afford it because I just bought an iPad....

I also added a third theory.

Either way, thanks again for all your help and comments!

Beantwortet! Antwort anzeigen Ich habe das gleiche Problem

Ist dies eine gute Frage?

Ja Nein

Bewertung 8

11 Kommentare

if the phone logs onto anetwork - how long will it keep the service until it looses the connection again?? - does it also happen when the phone lies on a table, at the exact same spot as before ?

5. Jul 2010 von markus weiher

The phone stays connected for a very varied amount of time. From 10 minutes to a few hours. It loses connection in my pocket as well as laying on a table. I can't guarantee that it was in the exact same position on the table thou.. But I'm off to bed now, late here. So it will stay in the same position for the next few hours.. Responding to any comments or answers in the morning.

5. Jul 2010 von rousp

right it's late here in europe (00:21) ;-) - i think the problem could come from a antenna problem or a contact problem (maybe some bga soldering connection problem)

5. Jul 2010 von markus weiher

Let's hope it's not a bga solder at least.... I've just decided that I couldn't afford the new iPhone, being a student...

But, why would a contact problem be fixed by re-booting or the flight mode thing?

5. Jul 2010 von rousp

The contact problem could be "minimal" and if the phone comes to a not that good covered area - it simply looses the connection. but it could also be a hardware issue and the phone isn't able to "sync" the service settings that it receives from the BTS (base transceiver station) - and that is one possible point where a phone get's kicked from the network

5. Jul 2010 von markus weiher

6 weitere Kommentare anzeigen

Einen Kommentar hinzufügen

15 Antworten

Gewählte Lösung

markus weiher @markusweiher

Rep: 35,1 Tsd.

140

71

53

Veröffentlicht: 6. Jul 2010

Einstellungen

sorry to answer that late (ok, it's 05:42am ;-)) - i think it's a connection problem - so, yes - open it again and check all the connections, search for broken parts in the area around the "do not remove" sticker

CLICK for a HUGEer version of the picture

check both sides - the circuits around the golden spring are for the antenna - so if there is a problem - it might lead to those problems. surely - the antenny could also have a problem, but it's not an antenna in the regular way - normally - it fails because of a bad connection

War diese Antwort hilfreich?

Ja Nein

Bewertung 7

11 Kommentare:

Hi again. For my curiosity and, perhaps, your interest. The problem could seem to be related to finishing conversations/data sessions and/or being in ares with a bad signal. This strengthens your suspicions, right? Or have I not understood something... =P

7. Jul 2010 von rousp

you got it right ;-)

7. Jul 2010 von markus weiher

The last few days my phone have acted more and more like a shrunk iPad. So I tried opening it today. Didn't see anything broken. But I didn't dare to remove the shields in order to access the inner logic board.. And that's probably where the fault is..

However, I'm accepting your answer. You shall not suffer for me not daring to open the logic board.. Thanks for your help!

9. Jul 2010 von rousp

i'm not suffering - the whole helping is sometimes also some kind of learning for me

9. Jul 2010 von markus weiher

+ bravo

9. Jul 2010 von mayer

6 weitere Kommentare anzeigen

Einen Kommentar hinzufügen

if the phone logs onto anetwork - how long will it keep the service until it looses the connection again?? - does it also happen when the phone lies on a table, at the exact same spot as before ? — markus weiher
The phone stays connected for a very varied amount of time. From 10 minutes to a few hours. It loses connection in my pocket as well as laying on a table. I can't guarantee that it was in the exact same position on the table thou.. But I'm off to bed now, late here. So it will stay in the same position for the next few hours.. Responding to any comments or answers in the morning. — rousp
right it's late here in europe (00:21) ;-) - i think the problem could come from a antenna problem or a contact problem (maybe some bga soldering connection problem) — markus weiher
Let's hope it's not a bga solder at least.... I've just decided that I couldn't afford the new iPhone, being a student...

But, why would a contact problem be fixed by re-booting or the flight mode thing? — rousp
The contact problem could be "minimal" and if the phone comes to a not that good covered area - it simply looses the connection. but it could also be a hardware issue and the phone isn't able to "sync" the service settings that it receives from the BTS (base transceiver station) - and that is one possible point where a phone get's kicked from the network — markus weiher
Hi again. For my curiosity and, perhaps, your interest. The problem could seem to be related to finishing conversations/data sessions and/or being in ares with a bad signal. This strengthens your suspicions, right? Or have I not understood something... =P — rousp
The last few days my phone have acted more and more like a shrunk iPad. So I tried opening it today. Didn't see anything broken. But I didn't dare to remove the shields in order to access the inner logic board.. And that's probably where the fault is..

However, I'm accepting your answer. You shall not suffer for me not daring to open the logic board.. Thanks for your help! — rousp
i'm not suffering - the whole helping is sometimes also some kind of learning for me — markus weiher

Matty t @mattyt81742 Rep: 13 1 · Answer 1 · 2011-04-19T13:48:44-07:00

Matty t @mattyt81742

Rep: 13

1

Veröffentlicht: 19. Apr 2011

Einstellungen

make sure the sim tray is flush with the top of the phone and that the aim card isn't bent

sorry sim card isn't bent, I had this problem with a 3G it kept droping 3G signal then turning off then saying connect to I tunes then no service. I took out the sim card and the tray blew down the hole in the phone put sim back in and it has sorted my problem hope this helps..

War diese Antwort hilfreich?

Ja Nein

Bewertung 1

1 Kommentar:

Similar problem with Wi-Fi being dropped and connected randomly.

Tried all the resets possible. Found online "micro-fissures in logic board" as the potential problem.

Solution, believe it or not, bake in oven to remelt the solder. FYI, that is how the solder is melted during manufacturing.

Will follow up here... REMIND ME

18. Mär 2015 von joel19522000

Einen Kommentar hinzufügen

cyberdoctormd @cyberdoctormd Rep: 97 3 · Answer 2 · 2012-04-01T18:04:32-07:00

cyberdoctormd @cyberdoctormd

Rep: 97

3

Veröffentlicht: 1. Apr 2012

Einstellungen

you can get the 3G or 3Gs and 4G antenna signal coil here

War diese Antwort hilfreich?

Ja Nein

Bewertung 1

Einen Kommentar hinzufügen

lakshmi @lakshmi57865 Rep: 13 1 · Answer 3 · 2012-05-08T02:52:10-07:00

lakshmi @lakshmi57865

Rep: 13

1

Veröffentlicht: 8. Mai 2012

Einstellungen

hi my iphone 3g show no service ...WHY PLEASE HELP ME

War diese Antwort hilfreich?

Ja Nein

Bewertung 1

Einen Kommentar hinzufügen

joel @joel27195 Rep: 13 1 · Answer 4 · 2012-08-02T16:15:34-07:00

joel @joel27195

Rep: 13

1

Veröffentlicht: 2. Aug 2012

Einstellungen

i have a quastion i have an iphone 3 but is giving me a hardtime with the signal always is going out of network and i dont know why i already checked the antenna and everything i d

War diese Antwort hilfreich?

Ja Nein

Bewertung 1

Einen Kommentar hinzufügen

jaybrooks76 @jaybrooks76 Rep: 643 7 2 1 · Answer 5 · 2010-09-07T03:54:47-07:00

jaybrooks76 @jaybrooks76

Rep: 643

7

2

1

Veröffentlicht: 7. Sep 2010

Einstellungen

I don't have a iphone but have you tried disabling one of the bands and make it 3g only or 1x only?

War diese Antwort hilfreich?

Ja Nein

Bewertung 0

3 Kommentare:

I just realized that I could do that when I updated. However I can only disable the 3G baseband. When I do so the connection drops within a few seconds. So I think it's safe to assume that the problem lies in the handling of non 3G signal. I just ned to identify the ICE's that processes that signal and find someone willing to check the BGA's for me.

7. Sep 2010 von rousp

right, you can only disable the 3g. identifying the parts isn't the problem - but the "new" ones are pretty expensive. "checking" bga's isn't an option. it might be one of the PA's and in that case, you might not even see anything. if the repair is possible - it could get pricey. if you can provide a "dead" iphone 3g for parts, it would get cheaper - but still - it's not done within a few minutes - those job's can take hours (i know that - i rewired those crappy nand flashes of an iphone 3g)

7. Sep 2010 von markus weiher

Haha, thanks you for your comments. I'm going to take your word for it. I've decided that I can live with the problems for a little while. And I'll look for an iPhone for parts in the meantime. =)

8. Sep 2010 von rousp

Einen Kommentar hinzufügen

Jacques @jacques21026 Rep: 1 · Answer 6 · 2011-08-22T21:25:17-07:00

Jacques @jacques21026

Rep: 1

Veröffentlicht: 22. Aug 2011

Einstellungen

iPhone 3G signal always drops out on my phone to the extent of me wanting to throw it at a brick wall!! It's the worst signal ever, Iv heard that the iPhone 3G was fitted with a dodgy antenna which is shielded behind a metal cover which also helps destabilize local signal it makes me sick and very frustrated daily to know that apple released it in that condition and say that they're not responsible for the signal...

Technology, we can't live it..but, we can't live without it!

Peace

War diese Antwort hilfreich?

Ja Nein

Bewertung 0

Einen Kommentar hinzufügen

eenzo69 @eenzo69 Rep: 1 · Answer 7 · 2011-11-01T20:22:27-07:00

eenzo69 @eenzo69

Rep: 1

Veröffentlicht: 1. Nov 2011

Einstellungen

Try shutting off your 3G connection (you find it under settings, general, network) and rebooting. If that solves it, then it's a software problem. Dunno what to tell ya, cuz I have that problem too but if I kill the 3G, phone gives me no problems. CRAZY!!!

War diese Antwort hilfreich?

Ja Nein

Bewertung 0

Einen Kommentar hinzufügen

elisha @elisha69428 Rep: 1 · Answer 8 · 2012-02-11T19:46:27-07:00

elisha @elisha69428

Rep: 1

Veröffentlicht: 11. Feb 2012

Einstellungen

I'm on the ipad baseband, 06.15.00 an I lost both 3G and wifi. So far the only option I have found was replacing the baseband chip. But I can't find it anywhere to buy. It's a infeleon x-gold 608

War diese Antwort hilfreich?

Ja Nein

Bewertung 0

3 Kommentare:

It now works** may 2012 using WHITEDOOR.

8. Mai 2012 von elisha

EASY SOLUTION!!!!! SO TYPE IN WHITED00R in google, and you'll FIND OUT MORE ABOUT IT, DOWNLOAD IT FOR YOUR IPHONE 3G ON THE IPAD BASBAND, IF IT'S NOT GETTING 3G or its NOT GETTING SIGNAL AT ALL.

WHITEDOOR: is pretty much a custom firmware for iPhone 3G and older devices that simulates the 5.0 software, although your iPhone will be running on 3.1.3, it will have all th latest features, and it'll be fast. And of course, YOUR CONNECTION WILL POP BACK UP

NOW IF YOUR WIFI IS NOT WORKING, THEN YOU NEED TO REFLOW THE PCB(YouTube it)

THANKS AND GOD BLESS

8. Mai 2012 von elisha

Ditto. "Reflow the PCB". Find it in Youtube. Also search "mirco fissures"

18. Mär 2015 von joel19522000

Einen Kommentar hinzufügen

michael azar @michaelazar Rep: 1 1 · Answer 9 · 2012-05-13T20:27:04-07:00

michael azar @michaelazar

Rep: 1

1

Veröffentlicht: 13. Mai 2012

Einstellungen

i just replaced my 3gs and i have a new factory unlocked phone same problem keeps happening to me too

i think it has to do with apples last update 5.1

i hade the problem with an unofficial unlocked phone but now the phone is a brand new replacement from apple so i don"t think it is your phone i think it has to do with an update or network problem.

also i notes when when i use internet than the phone drops the signal.

War diese Antwort hilfreich?

Ja Nein

Bewertung 0

Einen Kommentar hinzufügen

Doreen @doreen73890 Rep: 1 · Answer 10 · 2012-07-01T09:55:23-07:00

Doreen @doreen73890

Rep: 1

Veröffentlicht: 1. Jul 2012

Einstellungen

I am 68 just bought iphone but I keep losing signal too, cannot deal with all the stuff put out there thinking of changing back to a basic mobile for peace of mind - what do you think people?

War diese Antwort hilfreich?

Ja Nein

Bewertung 0

Einen Kommentar hinzufügen

elisha @elisha69428 Rep: 1 · Answer 11 · 2012-08-02T19:10:47-07:00

8/2/2012--- update, do not try the method shown on youtube, where it asks to put your iphone in the oven, my iphone bricked.

other than that, only software to help to atleast get the 3g back is the post below.

---------------------------------------

EASY SOLUTION!!!!! SO TYPE IN WHITED00R in google, and you'll FIND OUT MORE ABOUT IT, DOWNLOAD IT FOR YOUR IPHONE 3G ON THE IPAD BASBAND, IF IT'S NOT GETTING 3G or its NOT GETTING SIGNAL AT ALL. WHITEDOOR: is pretty much a custom firmware for iPhone 3G and older devices that simulates the 5.0 software, although your iPhone will be running on 3.1.3, it will have all th latest features, and it'll be fast. And of course, YOUR CONNECTION WILL POP BACK UP NOW IF YOUR WIFI IS NOT WORKING, THEN YOU NEED TO REFLOW THE PCB(YouTube it) THANKS AND GOD BLESS

Dieter @dieter11359 Rep: 205 Phoenix Smart Solutions 6 1 · Answer 12 · 2012-10-06T03:33:08-07:00

Dieter @dieter11359

Rep: 205

Phoenix Smart Solutions

6

1

Veröffentlicht: 6. Okt 2012

Einstellungen

and don't forget to ACTIVATE your iPhone after a restore! Otherwise it tell you "no signal"... kept me busy for over 5 hours with mainboard and dock connector swapping... :(

War diese Antwort hilfreich?

Ja Nein

Bewertung 0

Einen Kommentar hinzufügen

Bilal @bilal44912 Rep: 31 1 · Answer 13 · 2012-11-27T10:42:29-07:00

Bilal @bilal44912

Rep: 31

1

Veröffentlicht: 27. Nov 2012

Einstellungen

If u having signal problem do following things

1 :try software mostly 80% having softwere problems in this case u can try to jail break them and them if same not working try to downgrade coz i ph3 and 3gs some time make troubles on 5.1.1 or up so max keep ur phone below 5.1.1 softwere virsion

2: check signal entina try to resold with heat gun and then clean with chemcial or patrol aslo clean golden plates with patrol better to clean all you bord

Hope u will get signals..

Regards,

Bilal68181@gmail.com

War diese Antwort hilfreich?

Ja Nein

Bewertung 0

Einen Kommentar hinzufügen

david glasgow @davidglasg35008 Rep: 11 1 1 · Answer 14 · 2013-04-12T18:05:06-07:00

david glasgow @davidglasg35008

Rep: 11

1

Veröffentlicht: 12. Apr 2013

Einstellungen

where is the signal antenna on a iphone 3gs logic board

thanks

Dave.....

War diese Antwort hilfreich?

Ja Nein

Bewertung 0

Einen Kommentar hinzufügen

iPhone 3G

iPhone 3G keeps losing signal/service

Problem:

Circumstances:

Tried:

Theories

Update 1

15 Antworten

Update

Antwort hinzufügen