Verify Iphone 4s GSM blue signal coil? - GSM-Forum

itjstagame · 05-14-2013, 18:17

I have a 4S that was water damaged and presenting an issue with power button not working. I had a 4S shell that power button worked fine, so moved over the motherboard.

This fixed 4S worked excellent on Straight Talk for 2-3 weeks and then suddenly went to searching/No Service.

I have inspected each circuit and antennae connectors that has been referenced for signal and all 'look' good. I see the blue coil is a common cause for this issue on Iphone 4 and while mine 'looks' good is there any way to test if this is the cause or not using voltmeter?

Any other suggestions?

I have refreshed the iphone software and also updated iOS but this has not helped. The Straight Talk sim instantly worked fine in my Iphone 4 and a working AT&T sim was tried in this 4S but same result, 'Searching...' or 'No Service'.

I just want to verify if it is something like the IC (which I am not advanced enough to mess with) or something simple I can repair (even if it 'looks' fine).

Thank you.

05-14-2013, 18:17	#1 (permalink)
itjstagame Junior Member Join Date: Nov 2012 Posts: 13 Member: 1837778 Status: Offline Thanks Meter: 1	Verify Iphone 4s GSM blue signal coil? I have a 4S that was water damaged and presenting an issue with power button not working. I had a 4S shell that power button worked fine, so moved over the motherboard. This fixed 4S worked excellent on Straight Talk for 2-3 weeks and then suddenly went to searching/No Service. I have inspected each circuit and antennae connectors that has been referenced for signal and all 'look' good. I see the blue coil is a common cause for this issue on Iphone 4 and while mine 'looks' good is there any way to test if this is the cause or not using voltmeter? Any other suggestions? I have refreshed the iphone software and also updated iOS but this has not helped. The Straight Talk sim instantly worked fine in my Iphone 4 and a working AT&T sim was tried in this 4S but same result, 'Searching...' or 'No Service'. I just want to verify if it is something like the IC (which I am not advanced enough to mess with) or something simple I can repair (even if it 'looks' fine). Thank you.