iPhone 4 keeps searching for signal

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iPhone 4

第四代iPhone。维修过程直观易懂，但前置玻璃和LCD面板无法分开，只能作为同一零件更换。GSM版本， 8, 16, or 32 GB 容量 / 型号 A1332 / 黑色或白色

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Fay McIntosh @faymcintosh

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发帖于: 2013年12月31日

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iPhone 4 keeps searching for signal

My iPhone 4 keeps "searching" for a network. And it doesn't register "No Sim" when I remove this sim. I've opened it up, but I'm not sure if the blue coil is damaged.

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My iphone 4 just felt and when i handled it was on "searching".. I though it was some sim card issue, tryed everything and than reseted the phone. Nothing happend..

Now i cant register my phone and its still searching...

any help please?

由 Mateus 完成的 2015年10月3日

did you try the solution written below?

由 Abdul Galib 完成的 2015年10月5日

my iphone also keep on searching signals and at times it indicates that it has no service.. and i will ask also if u can connect to itunes even without signal on ur phone ?? and i had reformat my phone.

由 Dannah 完成的 2015年11月16日

yes u can connect to Itunes without signal even without sim card @dannah

由 Abdul Galib 完成的 2015年11月21日

you can using wifi to connect into iTunes for a while until the prob fix.

由 felix waukateyau 完成的 2015年12月1日

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Abdul Galib @galmoham

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This problem can happen if you disconnect the battery or if the battery get disconnected by it. You can tell if this is what happened because the year will say 1970 or so. The best way to solve this is to connect to WiFi and sync to the correct time. Then, switch airplane mode on/off a few times, remove the SIM card, and power off your iPhone. Reinsert your SIM and that should do it! Good luck with that.

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thank you maaan dz helped sooo much my iphone is ayt

由 Lebopo 完成的 2015年7月1日

You are welcom

sharing they say is Knowledge..

由 Abdul Galib 完成的 2015年7月27日

Brilliant and I didnt even have to do the SIM card removal, sorted with just the WIFI connection and airplane mode turned on and off a couple of times.

Many thanks almost bought a new phone !

由 stubbsn 完成的 2015年8月11日

u are welcome.. you may hit the "green up" button (helpful) to show ur appreciation ...

由 Abdul Galib 完成的 2015年8月20日

great work man!

由 smajors 完成的 2015年8月25日

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My iphone 4 just felt and when i handled it was on "searching".. I though it was some sim card issue, tryed everything and than reseted the phone. Nothing happend..

Now i cant register my phone and its still searching...

any help please? — Mateus
my iphone also keep on searching signals and at times it indicates that it has no service.. and i will ask also if u can connect to itunes even without signal on ur phone ?? and i had reformat my phone. — Dannah
yes u can connect to Itunes without signal even without sim card @dannah — Abdul Galib
you can using wifi to connect into iTunes for a while until the prob fix. — felix waukateyau
Brilliant and I didnt even have to do the SIM card removal, sorted with just the WIFI connection and airplane mode turned on and off a couple of times.

Many thanks almost bought a new phone ! — stubbsn
u are welcome.. you may hit the "green up" button (helpful) to show ur appreciation ... — Abdul Galib

Tom Chai @tomchai 声誉积分: 73.8千 19 111 82 · Answer 1 · 2013-12-31T10:20:25-07:00

Tom Chai @tomchai

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The coil looks okay, the symptom looks more like a baseband logic or hardware issue.

FYI this is the common procedure to resolve reception issues

If the phone is showing reception issues, try the following

Remove all external accessories to rule out 3rd party accessories that could block or even interfere with the signals

Test the reception on another known good identical phone to rule out coverage issues

Reboot/restore or upgrade the phone software to rule out potential software issues.

If none of the above works, there are probably hardware issues.

I've observed newly powered on iphones constantly display "searching" until the system clock is synchronized with apple servers and airplane mode is cycled. The baseband was stuck on wrong config data because the clock is off. reboot or just recycle the airplane mode should clear it out.

If it still doesn't work, go to settings-general-about to check the IMEI\baseband virsion\ICCID is abailable. Missing IMEI and version means that the baseband is not working, Having these but the ICCID is blank means that the SIM card is not linking with the phone. Both cases are difficult to repair

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Thanks Tom. sadly when I have successfully restored the device to factory settings I get an itunes message 'There is a problem with your phone' which means there is a hardware fault. so now I don't have access to settings. phone is out of warranty and has been opened up so apple cant help there. my network carrier says there is no reason why it shouldn't activate..

I've ruled out the software issue

will try it in another identical phone tomorrow

thanks for your help so far

由 Fay McIntosh 完成的 2014年1月1日

Thank You!!! That really helped

由 jarjanto 完成的 2014年10月21日

Love Tom's answer--just wanted to add that it is very easy to coincidentally knock off baseband components when prying up the battery on the logic board side. I bet if you look under magnification you can pinpoint the missing components.

Jess

由 jessabethany 完成的 2013年12月31日

Thanks Jess...will look for any missing components

由 Fay McIntosh 完成的 2014年1月1日

Hi Jess, I am your fan! I am very amateur fixing phone yet, since I am trying to fix iphones, you have been my best ever teacher. I am from Brazil and have learned a lot from your youtube videos. BTW, I did a mistake of prying up the battery, and an very very small IC was knocked off the board. I do not have yet the skills for micro soldering and my doubt is: 1) it seems the IC who came off is intact. If so, just resoldering it would fix the problem? 2) Can I pick the same IC from an older iphone and if I am successful to sold it, it would probably fix the problem? Or do I need to change many baseband componets to get the IMEI and Version number back on the GENERAL>etc?

由 AlbertoBrazil 完成的 2016年7月5日

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lambikirjad @michaelwolf 声誉积分: 25 1 · Answer 2 · 2015-02-01T22:52:42-07:00

lambikirjad @michaelwolf

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Hello everybody- This thing can happend when you open your iPhone 4S, change the LCD screen or change battery. For me- as I work with iphones the solution what has helped me is simple- first of all go to settins- reset- reset network settings.. Your phone then resets all network settings and 90% of the time your signal comes back as it was! :) Remember that resetting all network settings will delete your wifi passwords as well- so you need to connect again in every place you have joined wifi. Hope this will help many iPhone owners! :)

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Worked for me.. Thank you

由 Audrey 完成的 2016年9月25日

Thanks to this advice, I did it! I've rebooted! So grateful.

由 zazaricna 完成的 2018年7月3日

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Tech @tech_care 声誉积分: 37 1 · Answer 3 · 2014-01-02T21:47:59-07:00

Tech @tech_care

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发帖于: 2014年1月2日

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Oh ok.

Then next to the blue coil there should be white coil

Is that one in its place

Also conect the iphone to itunes that also sometimes gets it back up n runing

Also check the signal antena there little silver pins that go between the loud speaker and the frame if they r broken ur signal is weak

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isam @isam41479 声誉积分: 13 1 · Answer 4 · 2014-10-02T13:16:24-07:00

isam @isam41479

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I had the same problem , I took the Iphone 4 to a recognized technician and he fixed the problem , it was a hardware problem, the part of the Iphone responsable for reception and transmiting I think it is the antenna and the technician replaced it and now the Iphone 4 is working smoothly.

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