Develop Bugs

Sprint Galaxy Nexus - Modem Stability Issues

So, I figured I'd share since I couldn't find much information on the forums about this.
I recently, within last few weeks, started having issues with the modem on my GNex.
I had been running a ROM derived from AOSP Jelly Bean without issue, except the modem seemed to get poor signal quality.
I tried to upgrade the modem once the official Sprint JB release of FH05 started spreading.
At some point afterwards it seemed the modem would inexplicably start to die periodically... (By die I mean the status would change to searching and/or not connected and the status icon would change to no service icon). I could sometimes trigger life back in at times by toggling CDMA/LTE or CDMA Only options or the data enabled options or rebooting...
I went through a period of continually trying to reflash the various radios FD02, FC12, FH05... all in an attempt to get stability.
I had persistent issues even trying to flash the radios. The LTE radio would always flash fine, but the CDMA radio would often hang in flashboot forcing me to sever connection and restart.
This never seemed to fix the issue and I began to think I might either have bad flash memory on the radio partition or there was a problem with the radio hardware causing this issue.
I then remembered I had dropped the phone on concrete and it landed on the modem side of the phone... phone seemed fine besides a few new dings, but operated ok. I considered maybe this had something to do with the state of things.
Last night I took my phone back off using these instructions: http://www.ifixit.com/Teardown/Samsung-Galaxy-Nexus-Teardown/7182/1
I basically just jostled the internals a bit hoping to fix maybe a simple misalignment...
It has been a solid 12 hours and everything seems to be running strong.
This is purely speculation, but given that I haven't been able to consistently replicate any scenario other than it not working... I am hoping this is the fix.
I hope it might help someone else, or someone else with a similar problem can confirm or provide alternate conclusion.
I am currently running:
ROM:
http://forum.xda-developers.com/showthread.php?t=1801942
LTE and CDMA FH05:
http://forum.xda-developers.com/showthread.php?t=1620036#2
TWRP 2.2:
http://teamw.in/project/twrp2/92

shadowspires said:
So, I figured I'd share since I couldn't find much information on the forums about this.
I recently, within last few weeks, started having issues with the modem on my GNex.
I had been running a ROM derived from AOSP Jelly Bean without issue, except the modem seemed to get poor signal quality.
I tried to upgrade the modem once the official Sprint JB release of FH05 started spreading.
At some point afterwards it seemed the modem would inexplicably start to die periodically... (By die I mean the status would change to searching and/or not connected and the status icon would change to no service icon). I could sometimes trigger life back in at times by toggling CDMA/LTE or CDMA Only options or the data enabled options or rebooting...
I went through a period of continually trying to reflash the various radios FD02, FC12, FH05... all in an attempt to get stability.
I had persistent issues even trying to flash the radios. The LTE radio would always flash fine, but the CDMA radio would often hang in flashboot forcing me to sever connection and restart.
This never seemed to fix the issue and I began to think I might either have bad flash memory on the radio partition or there was a problem with the radio hardware causing this issue.
I then remembered I had dropped the phone on concrete and it landed on the modem side of the phone... phone seemed fine besides a few new dings, but operated ok. I considered maybe this had something to do with the state of things.
Last night I took my phone back off using these instructions: http://www.ifixit.com/Teardown/Samsung-Galaxy-Nexus-Teardown/7182/1
I basically just jostled the internals a bit hoping to fix maybe a simple misalignment...
It has been a solid 12 hours and everything seems to be running strong.
This is purely speculation, but given that I haven't been able to consistently replicate any scenario other than it not working... I am hoping this is the fix.
I hope it might help someone else, or someone else with a similar problem can confirm or provide alternate conclusion.
I am currently running:
ROM:
http://forum.xda-developers.com/showthread.php?t=1801942
LTE and CDMA FH05:
http://forum.xda-developers.com/showthread.php?t=1620036#2
TWRP 2.2:
http://teamw.in/project/twrp2/92
Click to expand...
Click to collapse
So you just took apart and reassembled and that got it working?

Maybe
xvanwilderx said:
So you just took apart and reassembled and that got it working?
Click to expand...
Click to collapse
Tried to sell phone on ebay because the wifi adapter was showing issues with range... I bought another and it was clear that the range of the older phone was having issues...
Tried to sell on ebay and buyer couldn't activate... just sent back and I can't get it to accept a flash at all... maybe trying the taking apart trick again...
Crazy

[Q] Still have that signal issue... Any advice appreciated.

First off, I've read dozens of threads relating to this issue and no one seems to have come up with a solid, concrete answer, apart from returning phones for a replacement (and often still having the issue).
I recently acquired a Gnex second hand that has presented the signal loss issue. I am coming from a Nexus S which gets full blue HSDPA bars of signal indoors on my desk. When I place the same sim into the Gnex, I get nothing but an X. Every now and then it registers on the network (Showing "YES OPTUS" - my provider here in Australia), but still no signal.
When I got the phone it was running Android Revolution HD 9.0 with a non-stock kernel (I didn't take note before wiping the device). No luck there with signal. I then flashed to 4.2.2 under Android Revolution HD 10.0. Still no signal. Since then I have tried:
- Lean Kernel
- Air Kernel
- SlimBean Rom
- About half a dozen different modems/basebands, local, european, north american, etc. Finally settled on XXLA02 as that was recommended for Australian users that aren't on Telstra/Vodafone (850MHZ).
- Matching RIL's to the basebands
None of the above options made an improvement. On the air kernel, I would see the signal (using *#*#4636#*#*) chance from UMTS to EDGE to GPRS to HSDPA to EDGE etc over and over, sometimes showing one grey bar on Edge. I could go outside and see one grey HSDPA bar stay there, but you still couldn't use data. Browsers would fail and the playstore wouldn't open without a connection.
As of today I have restored the phone using fastboot to the earliest available Google factory image (4.0.4). I unrooted the phone and relocked the bootloader, just back to complete stock. The modem that comes with the google image is XXLA02. In this current state, there is still no signal inside, where I would have full bars on the Nexus S, but when outside fiddling with the service menu, selecting AUS from the GSM/UMTS band selection menu gave me a reasonable HSDPA signal. Though it was erratic. It would fluctuate from 3/4 to 0/4, to 1/4 over and over and both upstream and downstream indicators would be going, yet nothing was coming through.
Trying to open the playstore was awful, but it eventually worked. I managed to get the Speedtest.net app down after a few failed attempts and ran a test to the nearest OPTUS server. The results came back as:
Ping: 235ms
D/L: 576kbps
U/L: 35kbps
Which is not very good, really. As soon as I walked back inside to get the Nexus S, though, the signal dropped right away to nothing.
I took the sim out, tried the same test with the Nexus S in the same spot outside and got the following results:
Ping: 145ms
D/L: 2241kbps
U/L: 1169kbps
Which is a bit more typical for the area.
So I'm running out of ideas
As the phone was bought second hand, I don't have anywhere I can return the phone to for a replacement. Unless I contact Google directly, I don't think that will be of any help, really. Is there anything else left I could try, or is this just an expensive paperweight?
Thanks for reading.

By typing *#06# IMEI code on the display that appears is identical to the one on the box or under the battery?
Problems in call / sms and registration on the net I happened to corruption of files in the EFS.

Maxmaximus said:
By typing *#06# IMEI code on the display that appears is identical to the one on the box or under the battery?
Problems in call / sms and registration on the net I happened to corruption of files in the EFS.
Click to expand...
Click to collapse
Hi, Thanks for the response.
The IMEI shown with that code is the same as what is under the battery :good:

Could be damaged/disconnected antennas.
Sent from my Galaxy Nexus using Tapatalk 2

Sounds like you got a lemon. SOL.

JPBeard21 said:
Could be damaged/disconnected antennas.
Sent from my Galaxy Nexus using Tapatalk 2
Click to expand...
Click to collapse
Cheers for the suggestion. I know it has been opened before to replace the USB daughterboard for charging, twice. I'll see if I can get it apart and have a look.
cctoro said:
Sounds like you got a lemon. There was a batch if gnexs that had signal issues. I had a bad one, returned it and the new one was fine. Obviously you can't do that, SOL.
Click to expand...
Click to collapse
Yeah, it's sounding like I'm SOL as it doesn't seem to be a software fixable issue. Pain in the ass, really. Thanks for the info. :good:

signal dropped
My Phone some times in standby mode, GSM signal dropped/network
disconnected.
same time high strength show in my other phone.
i need restart the phone then only re-connected the network and possible
to make call .. !
SMS function also not proper.
Incoming SMS i received but outgoing SMS not work at all.
How it sole?
Build number: JRO03C.I9250XWLH2
Baseband version: I9250XXLF1
Android version: 4.1.1
Kernel Version: 3.0.31-g6fb96c9
samb0rg said:
First off, I've read dozens of threads relating to this issue and no one seems to have come up with a solid, concrete answer, apart from returning phones for a replacement (and often still having the issue).
I recently acquired a Gnex second hand that has presented the signal loss issue. I am coming from a Nexus S which gets full blue HSDPA bars of signal indoors on my desk. When I place the same sim into the Gnex, I get nothing but an X. Every now and then it registers on the network (Showing "YES OPTUS" - my provider here in Australia), but still no signal.
When I got the phone it was running Android Revolution HD 9.0 with a non-stock kernel (I didn't take note before wiping the device). No luck there with signal. I then flashed to 4.2.2 under Android Revolution HD 10.0. Still no signal. Since then I have tried:
- Lean Kernel
- Air Kernel
- SlimBean Rom
- About half a dozen different modems/basebands, local, european, north american, etc. Finally settled on XXLA02 as that was recommended for Australian users that aren't on Telstra/Vodafone (850MHZ).
- Matching RIL's to the basebands
None of the above options made an improvement. On the air kernel, I would see the signal (using *#*#4636#*#*) chance from UMTS to EDGE to GPRS to HSDPA to EDGE etc over and over, sometimes showing one grey bar on Edge. I could go outside and see one grey HSDPA bar stay there, but you still couldn't use data. Browsers would fail and the playstore wouldn't open without a connection.
As of today I have restored the phone using fastboot to the earliest available Google factory image (4.0.4). I unrooted the phone and relocked the bootloader, just back to complete stock. The modem that comes with the google image is XXLA02. In this current state, there is still no signal inside, where I would have full bars on the Nexus S, but when outside fiddling with the service menu, selecting AUS from the GSM/UMTS band selection menu gave me a reasonable HSDPA signal. Though it was erratic. It would fluctuate from 3/4 to 0/4, to 1/4 over and over and both upstream and downstream indicators would be going, yet nothing was coming through.
Trying to open the playstore was awful, but it eventually worked. I managed to get the Speedtest.net app down after a few failed attempts and ran a test to the nearest OPTUS server. The results came back as:
Ping: 235ms
D/L: 576kbps
U/L: 35kbps
Which is not very good, really. As soon as I walked back inside to get the Nexus S, though, the signal dropped right away to nothing.
I took the sim out, tried the same test with the Nexus S in the same spot outside and got the following results:
Ping: 145ms
D/L: 2241kbps
U/L: 1169kbps
Which is a bit more typical for the area.
So I'm running out of ideas
As the phone was bought second hand, I don't have anywhere I can return the phone to for a replacement. Unless I contact Google directly, I don't think that will be of any help, really. Is there anything else left I could try, or is this just an expensive paperweight?
Thanks for reading.
Click to expand...
Click to collapse

tdreji said:
My Phone some times in standby mode, GSM signal dropped/network
disconnected.
same time high strength show in my other phone.
i need restart the phone then only re-connected the network and possible
to make call .. !
SMS function also not proper.
Incoming SMS i received but outgoing SMS not work at all.
How it sole?
Build number: JRO03C.I9250XWLH2
Baseband version: I9250XXLF1
Android version: 4.1.1
Kernel Version: 3.0.31-g6fb96c9
Click to expand...
Click to collapse
I would update to the latest OTA update and verify you have the latest radios.
Edit: also make sure your sim card's contact points are clean and making a snug connection.
Sent from my Galaxy Nexus using Tapatalk 2

Resigned to just getting rid of the phone. Will try and get a newer revision of it without the signal issues.

Toro Network Drops, 4.2.2 and 4.3

Hey guys - my VZW Gnex (it's a refurb to replace my old one with a bad screen) has been having excessive network dropouts lately. When I boot the phone, it doesn't acquire signal for over a minute, when I place a call I lose signal afterwards, and data drops out randomly. The device will say it's connected (blue bars), although I cannot use the internet. Also, it'll randomly loose cellular connectivity, although indicate that it has signal. I'll go to send a text and it'll immediately have send errors, and I am unable to make or receive calls, even though it shows I have signal. To fix, a reboot is always necessary. This has happened on 4.3 (crDroid) and 4.2.2 (CM 10.1.3 stable). It has happened across all the different radios, 4.0.4 and up, and across several different kernels. Does anyone have suggestions, the phone isn't really usable if people can't get in touch and I'm unaware that they can't.
EDIT: When I go into the phone info menu *#*#4636*#*# when the radio has no data, it says preferred network is "unknown." If I change it, the setting immediately goes back to unknown.

U might need to go through the insurance and get another one.
Sent from my Galaxy Nexus using XDA Premium 4 mobile app

eriscentro said:
Hey guys - my VZW Gnex (it's a refurb to replace my old one with a bad screen) has been having excessive network dropouts lately. When I boot the phone, it doesn't acquire signal for over a minute, when I place a call I lose signal afterwards, and data drops out randomly. The device will say it's connected (blue bars), although I cannot use the internet. Also, it'll randomly loose cellular connectivity, although indicate that it has signal. I'll go to send a text and it'll immediately have send errors, and I am unable to make or receive calls, even though it shows I have signal. To fix, a reboot is always necessary. This has happened on 4.3 (crDroid) and 4.2.2 (CM 10.1.3 stable). It has happened across all the different radios, 4.0.4 and up, and across several different kernels. Does anyone have suggestions, the phone isn't really usable if people can't get in touch and I'm unaware that they can't.
EDIT: When I go into the phone info menu *#*#4636*#*# when the radio has no data, it says preferred network is "unknown." If I change it, the setting immediately goes back to unknown.
Click to expand...
Click to collapse
This is a known issue with 4.3 ROMs. I'm not sure about 4.2.2. It looks like CM 10.2 may have a fix for it in the next nightly. One known fix is to edit build.prop to include
ro.telepohny.default_cdma_sub=0
Thank has worked for me.

dlabadie said:
This is a known issue with 4.3 ROMs. I'm not sure about 4.2.2. It looks like CM 10.2 may have a fix for it in the next nightly. One known fix is to edit build.prop to include
ro.telepohny.default_cdma_sub=0
Thank has worked for me.
Click to expand...
Click to collapse
I've added that line, doesn't help

[Q] update modem/firmware/kernel to fix data issues?

Since I started working full time in my new career I haven't had time to keep up with the changes. Can I get someone in the know to help me out with this?
I remember reading that KitKat was known to have data issues. I have the following:
T-Mobile model SM-N900T
4.4.2
N900TUVUCNB4
custom kernel: 3.4.84-leanKrnerl-hlte-2.2 (don't remember name, got it here)
stock rom modified
Problem is every once in a while I lose data connection even though it shows a 4G icon and several bars of service. I even had T-Mobile send me the signal booster, which is installed at my home and seems to be working, but same issue continues to happen. And if I turn on WiFi at that point, WiFi connects, but 4G icon doesn't go away, and I stay without data access even though I'm supposedly connected to WiFi.
As you can imagine, this is annoying. It happens at least once a day, sometimes multiple times. Then it goes back to normal.
I don't have the time to update fully to a new rom with new firmware and have to reinstall everything. Is there new modem/radio/firmware/kernel I can install over my existing installation and expect to see this issue go away? Or am I stuck with this until I change phones?
Thanks for your patience and helping me out with this.

Unfortunately its a common issue and there is no fix for it.
quick fix it to out your phone in airplane mode then out of it

Thanks, although that sucks to hear. Of all my Samsung devices (see sig + smart tv, blu-ray, sound bar, tablets) the Note III has by far been the buggiest. Both my wife and I have had buggy experiences and I'm rooted and she's fully stock. Not nearly as happy with this Note III as I was with the Note II, that's for sure.
Once again, thanks for taking the time to answer.

network issues
Max_Pain said:
Thanks, although that sucks to hear. Of all my Samsung devices (see sig + smart tv, blu-ray, sound bar, tablets) the Note III has by far been the buggiest. Both my wife and I have had buggy experiences and I'm rooted and she's fully stock. Not nearly as happy with this Note III as I was with the Note II, that's for sure.
Once again, thanks for taking the time to answer.
Click to expand...
Click to collapse
I too had network issues. My 4G would slow to a crawl or would become non responsive. It would take a reboot or airplane mode toggle to make 4G work for about an hour before it goes bad again.
I updated to the latest NF4 firmware and it has been running for the past 48 hours with no issues.
Speed is not much of an improvement. I get around 30mbps /22mbps in NYC. But data stability has increased to a great extent. I do get the occasional hiccups with data , but it resolves itself in about 10-15 seconds.
Hope this helps you
Rooted Note 3 with stock NF4 firmware / debloated

Updated to nf4 before bed last night so it's only been half a day but will post result later tonight when I get home where I usually experience this data issue to see if the new firmware makes a difference.
Update: so far so good. I've been home for several hours now and haven't gotten any data issues.
OK spoke to soon. 10 minutes after I posted my data stopped working. Had to toggle airplane mode.

[Q] Slow Download on 3G (Upload OK), not a network problem

Hello all
I have an I9195 LTE, the download speed on 3G has been very slow for the last month or so. I don't get 4g so I cannot test it out to see if that is ok or not. The upload speed is seemingly a bit better but still slower than normal. I have tried two different networks, UK based so GiffGaff and EE (T-Mobile) and the problems is identical on both operators.
A while ago I updated to a stock rom which advised updating the Modem at the same time as the original was causing low signal levels. I did this but have now restored the phone to a newer rom and updated to Modem-I9195XXUCNH5. Currently I have CM11 installed (although it makes NO different whether it is a stock, or a custom rom - the speed problem is identical on both).
A video is attached to demonstrate the problem. The problem occurs on two independent speed checking services (the second one was an awful awful app, but done to confirm it wasn't just speedtest.net playing up). Downloads from the play store are slow (max of about 150kb/s) and this is shown to speed up significantly when connecting to my wi-fi (100mbit) showing it isn't an overall problem with the phone hardware.
My theory is something is physically broken in the phone as I have done everything I can to test using different iterations of software, baseband, custom roms etc and even restored the phone back to the original stock rom it had when I purchased it (the speeds were fine then).
Can anyone shed any light on this?
Shows the problem - http://youtu.be/4UcwMEnlt_o
or

Bump for interest...