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Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White. This page aims to help users troubleshoot, fix, and seek help for the iPhone 4.

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iPhone 4 shows no service after changing the display and touch!

i cracked my display of iPhone after dropping it very hard on the ground..the lcd and touch had a crack so i replaced it myself getting help from websites and they are working very well...but after fixing those problems my phone shows "NO SERVICE"...it is a factory unlocked phone...and i have checked antenna cable and it is connected properly..wi-fi ,bluetooth,compass and gps works well but the network is having problem.....PLEASE HELP!!!!

Answer this question I have this problem too

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look like your internal dock connecter damaged. take out for checking if the pins are broken then have to change this .

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There is a little metal piece "clip" next to the battery connector, Also called the pressure contact. These clip has a small pin that has to be bent in order to touch the back cover of the phone. If not you will have a "No carrier" issue.

Cheers

Erik

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There is a small blue diode on the logic board to the left of the battery connector - underneath the dock connector flex.

If this blue diode is missing/broken (may have been damaged during repair) then this will lead to no signal.

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I am sure that by now you know it is NOT a diode, it is an inductor.

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That is not a diod the blue ic is an inductor.

Sometimes people ruin the antenna flex cable. Replacing the antenna will fix this.

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Your network is totally depend upon the bottom dock. Take out the battery and then take out the speaker box downside one. then check the little pins attached with it . it may be 5 pins. it will contacts with internal base. press the pins inside while speaker base is going inside. it will fitted poperly . check it twice and the wire of speaker base will contact on the logic board . after putting inside. out the small pin which hold the battery jack and it will touch you phone's back to strength the wifi range . if these two only. these are only responsible for wifi and no service issue.

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None of these answers worked for me. What I actually found is that if you follow the antenna wire up from the bottom, it routes through a couple of guides next to the battery connector. At the end of the antenna, there is a small clip that actually needs to snap INTO the socket on the board - similar to how all of the other connectors attach, but this is just a single pin. Boom - 5 bars!

I did this on a Sprint (CDMA) iPhone 4. Hope this helps some of you.

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Boom. This worked for me. Thank you so much!

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Hi has the same problem with my iphone 4 that was broken the digitizer lcd,i replaced a new digitizer lcd screen purchased from ebay.after installed ,my iphone 4 having signal problem,it say NO SERVICE/SEARCHING,then i took the motherboard and installed in to another iphone 4 that from my son ,and it work find.so i have to purchased another lcd screen from ebay again,but from other seller,and this time work for me.so this is let all you guy know that worked for me.hope this help.good luck you guys.

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suvaash will be eternally grateful.
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