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1 Motherboard swap on s4
Hey, I just recently wanted to bring life back to my s4 phone. I swapped motherboards from a mobile with broken screen to one that has been water damaged but with a perfect screen. Everything about the phone works now except im not able to call anyone. Internet/wifi works fine but im not able to make a call. I have contacted many different phone providers to check if the imei is locked but it is not. Can someone help me?
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When you try to make a phone call, what happens specifically? Do you get an error message perhaps? Did you insert your carrier's SIM card in the phone before or after turning it on? Is the SIM card activated?
- de Mrs Fix It
I can send a text messange only if i switch back and forth from airplane mode. I do not get any sim card messages indicating that the phone is locked. The SIM card i activated and works with other phones i have tested. When i try to make a phone call i lose all signal and then it says that signal is unavailable.
- de olechristian96
Okay if this sim card uses 4G it will connect to 4G for data if the phone is set to acquire 4G network.
Once someone calls you or you call someone it will switch the network handoff to 3G / H+ then the calling incoming or outgoing starts.
Try playing with the network settings in terms of LTE / 3G / 4G. Try 3G and 2G mode (It's usually the second setting for the option). The first setting is auto switching from all modes using best preferred. You can set it to exclude 4G.
See what works and what doesn't.
- de Ben
Thank you so much for fast answer! I tried checking the antenna cables and they seem to be fine. Whenever i turn on and off airplane mode im able to send a sms. But the signal is lost when trying to make a call. Something must be causing this bad network connection, but im not able to figure it out. I tried swapping the back panels too without any luck.
- de olechristian96
It's an antenna contact issue but I'm not sure exactly sure which antenna connection is at fault here. The model number of each label behind the screen is important. I think it's best you post pictures here of the back housing with the model numbers on it and the charging port and the model number printed on the back of the screen frame itself (Usually just says i9505 or something like that).
Anyway there is some good information here on troubleshooting antenna contact issues:
http://blog.brokenlcds.com/samsung-galax...
I advise to avoid during board level repair stuff only as a last resort.
- de Ben
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