Sounds like you may have knocked off the signal resistor off of the logic board when you was disconnecting a connector.

i had to replace the motherboard. Works great now.

Would soldering the 2 points where the resistor was work like on the iPhone 4?

In theory yes, but I did a beautiful solder on mine under a magnifying glass. The battery percentage wasn't reading right and like I said before, I had a carrier problem after soldering. My guess is some kind of interference or short circuit in the motherboard. So like LEE FORGET suggested I replaced the motherboard. Down here in Brazil the mother board cost me 50% of the original iphone price. But I figured it was better to fix it than let it go to waste. Working fine now.

I soldered the 2 together and I'm now getting really good signal :) so there's no need to change the motherboard, thanks for everyones help

Where is the resistor on the 4s?

hello after replaced the lcd I don't have imei any help???

Hi everyone,

Sorry for my english if I make mistakes, I'm french, and still learning even if my wife is english ;).

So I had the No service problem after replacing the LCD screen on an iPhone 4S and the Simcard seemed not to be recognized anymore. I checked everything I read in comments of differents questions about this problem people asked on iFixit.

Everyhting was connected correctly, I didn't break the litlle blue coil etc... After a long long night searching, I found where was the problem.

The little black pressure contact underneath the battery connector was not "high" enough. I don't really know if you gonna get what I try to explain but I try. This pressure contact has to touch the back cover of the iPhone where there's a metal part who's connected by the two screws to the external antennas of the iPhone. So I just put a little more up this part for that to touch the back cover when you close it.

In the end I recovered the signal and everything works well now.

I'll put some photos if any of you need some and hope that can help you! ;)

Any suggestions on the best place to get a new motherboard?

I just did a screen replacement on an Iphone 4S and have checked all connections they are all good, blue resistor is still there. Everything else works fine, WIFI signal is great etc.

Problem is that it doesn't recognize if I remove or insert the SIM card and all I get at the top of the screen is Searching...

I've tried the SIM in my unlocked personal phone and it works fine. I also get signal just fine on the same network using my personal Iphone 4 and SIM card, so I know it isn't a signal issue with my location.

Any sugg's?

Thanks,

Jeff

I'm trying to attach an image with a piece that my logic board doesnt have, its the black resistor looking thing beside the dock connector cable (Step 9 — Dock Connector Cable in the tutorial) , could this missing piece be my searching... issue

well i had the same problem after installing a new screen, but the i dissembled my phone completely, and assembled it again making sure every cable was placed correctly and cleaned all metal to metal contact, and then i began working again.

my iphone four did the same but it was a minor error i made while reinstaling after placing the screen. i had trouble sliding in the sim card case so i dis assembled again and looked for any problems.i under moderboard you can see where the sim card enters there was a small rubber that protects the sim card as soon as i took that out reassembled. and turned it on there was heaven music in the room i had signal once again.

Hello, i just replaced my front and back-glass on my iPhone 4s, somehow i lost the Mic 2 # connector. When i started the phone up it could not find the Wifi or my Sim card, what have i done wrong?

Best regards,

Sebastian

Well I also was having a similar problem with my iphone 4s so I ended up taking the shield off the one that covers the connectors on the top left corner next to the camera and it worked but i also put wiring tape over them so they wouldn't move sounds to risky but it worked for me...

After change the screen STUCK ON 'SEARCHING'??

WE KNOW HOW TO FIX!!!

Go to

Settings

general

date and time

JUST SET UP YOURE TIME AND DATE !!

FOLLOW US ON FACEBOOK! IF IT FIXED LIKE US!

Gsm Shop Maastricht

IT WORKS WITH IPHONE 5 4S 4 3GS!!