[Q] loss of gsm signal

[mibz]

Hi guys, please I need some help with my xperia z, it presently does not get any network regardless of changing sim. Dis occurred few days after upgrading to newest firmware .67. It worked fine after some days but signal started gettin poorer.realised dat after givin the phone a little bump it comes back to full signal.eventually it stopped getting network altogether, except in rare cases when I feel I'm close to a tower , it searches but cannot register on the network sayin to ensure that a network signal is in range 99asu.I also cannot switch to manual select of network. Please anybody with a solution. Want to know if its a hardware or software problem. I don't have a sony service centre here that can help me.thanks

 

[gwithrow]

I had a similar issue and found that my "APN" was missing (Telcel Mexico). I created a new APN from information on the Internet and all is well.

Sent from my C6602 using XDA Premium 4 mobile app

 

[mibz]

I had a similar issue and found that my "APN" was missing (Telcel Mexico). I created a new APN from information on the Internet and all is well.

Sent from my C6602 using XDA Premium 4 mobile app

i doubt if its a similar issue. i dont get any signal at all

 

[rohit25]

my brother it seems that the device is faulty... get it RMA'd

 

[mibz]

my brother it seems that the device is faulty... get it RMA'd

Pls what do you mean by RAM'd?

 

[yamiAMR]

Hi guys, please I need some help with my xperia z, it presently does not get any network regardless of changing sim. Dis occurred few days after upgrading to newest firmware .67. It worked fine after some days but signal started gettin poorer.realised dat after givin the phone a little bump it comes back to full signal.eventually it stopped getting network altogether, except in rare cases when I feel I'm close to a tower , it searches but cannot register on the network sayin to ensure that a network signal is in range 99asu.I also cannot switch to manual select of network. Please anybody with a solution. Want to know if its a hardware or software problem. I don't have a sony service centre here that can help me.thanks

What model do you have??
You upgraded by PC Companion or by flashtool?? Maybe the baseband is incorrect and the phone don't have signal, maybe your carrier use two band and not both are in all coverage.

 

[mibz]

What model do you have??
You upgraded by PC Companion or by flashtool?? Maybe the baseband is incorrect and the phone don't have signal, maybe your carrier use two band and not both are in all coverage.

Initially upgraded to .434 using flashtool, then .67 by OTA. By baseband do u mean 2g and 3g? Cos I don't get any form of signal at all.

 

[tally114]

Hi there, I have had the same problem: after updating the XZ to 4.2.2 (2.67 over OTA) the signal dropped instantly. Therefore I had to send it back Sony Care. They fixed it. The update has overwritten a different smallband/baseband-version above the other one, just as I suspected. I bet you can flash it yourself (your an XDA user..) instead of waiting 2 weeks or more. If you don't know how it works and you've absolutely no experience with flashing, just send it back to Sony care.

I think the easiest way is to flash a different (older) baseband-version on your XZ, reboot/factory reset and see if it works. The second method is to try downgrading the software to .244 INCLUDING the baseband-version, then update it by flashing the XZ to 2.67 while EXCLUDING the baseband-version. The third option is to re-flash (with flashtool) the 2.67 update but a different version (GLOBAL).

My phone details:
Modelnumber: C6603
Android-version: 4.2.2
Smallbandversion: 9x15A-ACEFWMAZQ-30110068-44
Kernelversion: 3.4.0g43a9ba9
Buildnumber: 10.3.1.A.2.67

Altough your smallband/baseband may differ from mine. Therefore, please find your own software-version. I'm using:
GLOBAL-LTE_10.3.1.A.2.67 (Netherlands)

Goodluck! Please let us know about your issue:fingers-crossed:.

 

[yamiAMR]

Initially upgraded to .434 using flashtool, then .67 by OTA. By baseband do u mean 2g and 3g? Cos I don't get any form of signal at all.

But what Xperia Z model do you have?? C6603, C6602, C6606??

I have a similar situation in the case of C6603, in my carrier sometimes I have 2G signal but never 3G and other times no signal. In the case of OTA or PC Companion updates, sometimes upgrade to diferent model or carrier, I have a friend that upgrade his Xperia Arc by PC Companion but with the uncarrier firmware. Maybe this is your case, the OTA firmware don't well upgrade your base band.

In this case I suppose that you can flash only the baseband by Flashtool, but be carreful that the firmware was made for your Xperia Z (C6603, C6602, C6606).

 

[mibz]

But what Xperia Z model do you have?? C6603, C6602, C6606??

I have a similar situation in the case of C6603, in my carrier sometimes I have 2G signal but never 3G and other times no signal. In the case of OTA or PC Companion updates, sometimes upgrade to diferent model or carrier, I have a friend that upgrade his Xperia Arc by PC Companion but with the uncarrier firmware. Maybe this is your case, the OTA firmware don't well upgrade your base band.

In this case I suppose that you can flash only the baseband by Flashtool, but be carreful that the firmware was made for your Xperia Z (C6603, C6602, C6606).

ok thanks i use a c6602

 

[mibz]

Hi there, I have had the same problem: after updating the XZ to 4.2.2 (2.67 over OTA) the signal dropped instantly. Therefore I had to send it back Sony Care. They fixed it. The update has overwritten a different smallband/baseband-version above the other one, just as I suspected. I bet you can flash it yourself (your an XDA user..) instead of waiting 2 weeks or more. If you don't know how it works and you've absolutely no experience with flashing, just send it back to Sony care.

I think the easiest way is to flash a different (older) baseband-version on your XZ, reboot/factory reset and see if it works. The second method is to try downgrading the software to .244 INCLUDING the baseband-version, then update it by flashing the XZ to 2.67 while EXCLUDING the baseband-version. The third option is to re-flash (with flashtool) the 2.67 update but a different version (GLOBAL).

My phone details:
Modelnumber: C6603
Android-version: 4.2.2
Smallbandversion: 9x15A-ACEFWMAZQ-30110068-44
Kernelversion: 3.4.0g43a9ba9
Buildnumber: 10.3.1.A.2.67

Altough your smallband/baseband may differ from mine. Therefore, please find your own software-version. I'm using:
GLOBAL-LTE_10.3.1.A.2.67 (Netherlands)

Goodluck! Please let us know about your issue:fingers-crossed:.

thanks a lot, i'l try what u suggested, i know how to flash but dunno how i can do that without the baseband like u said, cos i already did a factory reset .i use a c6602 guess il find a version here that i can use.i'l hola at you if i hit any roadblocks cos i dont have esony care here.thanks a lot

 

[yamiAMR]

ok thanks i use a c6602

Look this: C6602 10.3.1.A.2.67 STOCK

If you have doubts and I can help you tell me.

 

[tally114]

To find your version, just dial *#*#7378423#*#* => service info => software info => File system version: ......; download it from Xda and (re-)flash it. I've read about this; it happens a lot with XZ's with the GLOBAL firmware. You've probably the same version. Good luck and please let us know

 

[mibz]

To find your version, just dial *#*#7378423#*#* => service info => software info => File system version: ......; download it from Xda and (re-)flash it. I've read about this; it happens a lot with XZ's with the GLOBAL firmware. You've probably the same version. Good luck and please let us know

hi, i jst re flashed with the 2.67 version the other guy posted in this thread, and its still not working, no network signal at all (0 dbm 99 asu), i realised i have the same baseband and kernel version with yours although i use a c6602. its global_hspa though.what do you think i should do next please. thanks

 

[yamiAMR]

hi, i jst re flashed with the 2.67 version the other guy posted in this thread, and its still not working, no network signal at all (0 dbm 99 asu), i realised i have the same baseband and kernel version with yours although i use a c6602. its global_hspa though.what do you think i should do next please. thanks

Try to flash full firmware, because you don't have signal at all, maybe could be hardware issue. Cultural question, You try your sim card in another phone, don't you?

 

[mibz]

Okay I eventually found out what the problem was.it's a hardware problem, connection of the antenna near the vibrator, bottom right when lookin at back of phone was loose.thanks to all who posted suggestions.eventually opened it myself.