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iPhone 3G是第二代iPhone。型号A1241,有8或16 GB容量,和炫酷的黑色或洁白的白色塑料背面。修复比第一款iPhone更简单。需要螺丝刀、撬撬工具和吸尘工具。

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iPhone 3G keeps losing signal/service

Problem:

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

Circumstances:

  • 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

Tried:

  • 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

Theories

  1. 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..
  2. ??
  3. 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.

Update 1

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!

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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 ?

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.

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)

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?

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

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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

Block Image

CLICK for a HUGEer version of the picture

Block Image

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

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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

you got it right ;-)

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!

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

+ bravo

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

Update

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..

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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

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

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

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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

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

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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.

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)

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. =)

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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

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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!!!

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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

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It now works** may 2012 using WHITEDOOR.

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

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

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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.

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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?

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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

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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... :(

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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

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

thanks

Dave.....

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