Iphone 4G searching, very low signal/no service - GSM-Forum

Stokholm · 09-10-2015, 02:33

Hello All

My daughter's iPhone 4 has started behaving strangely, as it suddently can't find any cell networks or 3G connection, just says searching / no service, and then seldom a very weak signal. Wifi works perfectly. She say that she might have dropped it, but don't recall... definitely no water damage.

This is what I have done so far:
Checked the time and date.
Changed the SIM card.
I have restored to factory setting in iTunes.
I have switched the antenna.
I have checked the blue coil (not missing and in place, can't move it)

Any good advise?

Thanks

chienvietnam · 09-10-2015, 14:49

you test bb and imei

Stokholm · 09-15-2015, 05:03

Quote:

Originally Posted by chienvietnam

you test bb and imei

How do I check these? It does not report IMEI or BB problems.

HDccam · 09-24-2015, 10:22

You did everything right, the only thing you have to do is change your PA. Your network PowerAmplefier seems not to work.
Thats ic U1_rf
It cost a few bucks on ebay. Change this ic and the network will be full power again.
It was a common problem in the old days. I use to fix a lot of 4 in the past.

Have fun fixing

Stokholm · 09-25-2015, 01:56

Thank you very much for the suggestion. Could putting pressure over U1_rf fix the problem, I am not skilled to change such an IC.

jollykhanna · 09-25-2015, 11:40

Ya this is a similar problem My Iphone 4 also faced. But taking it to the company get it resolved quickly and easily. They charged me nothing as they said it was just a minor and common problem.

09-10-2015, 02:33	#1 (permalink)
Stokholm Junior Member Join Date: Oct 2011 Posts: 39 Member: 1676326 Status: Offline Thanks Meter: 1	Iphone 4G searching, very low signal/no service Hello All My daughter's iPhone 4 has started behaving strangely, as it suddently can't find any cell networks or 3G connection, just says searching / no service, and then seldom a very weak signal. Wifi works perfectly. She say that she might have dropped it, but don't recall... definitely no water damage. This is what I have done so far: Checked the time and date. Changed the SIM card. I have restored to factory setting in iTunes. I have switched the antenna. I have checked the blue coil (not missing and in place, can't move it) Any good advise? Thanks

09-25-2015, 11:40	#6 (permalink)
jollykhanna Junior Member Join Date: Sep 2015 Location: India Posts: 2 Member: 2463922 Status: Offline Thanks Meter: 0	Similar Problem Lately Ya this is a similar problem My Iphone 4 also faced. But taking it to the company get it resolved quickly and easily. They charged me nothing as they said it was just a minor and common problem.

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09-10-2015, 14:49	#2 (permalink)
chienvietnam Junior Member Join Date: Jul 2015 Posts: 3 Member: 2423343 Status: Offline Thanks Meter: 0	you test bb and imei

09-24-2015, 10:22	#4 (permalink)
HDccam No Life Poster Join Date: Mar 2012 Location: Amsterdam, Netherlands Posts: 754 Member: 1732818 Status: Offline Thanks Meter: 532	You did everything right, the only thing you have to do is change your PA. Your network PowerAmplefier seems not to work. Thats ic U1_rf It cost a few bucks on ebay. Change this ic and the network will be full power again. It was a common problem in the old days. I use to fix a lot of 4 in the past. Have fun fixing

09-25-2015, 01:56	#5 (permalink)
Stokholm Junior Member Join Date: Oct 2011 Posts: 39 Member: 1676326 Status: Offline Thanks Meter: 1	Thank you very much for the suggestion. Could putting pressure over U1_rf fix the problem, I am not skilled to change such an IC.