Ever since I've upgraded to marshmallow, I haven't been able to use the Navigation feature in Maps. The maps correctly show my current location but when I start Navigation in Google Maps, the location remains the same even if I am moving in the car. I have tried Fulmics and Limitless but still facing the same issue. Any thoughts?
Anyone?
napster_nagrath said:
Anyone?
Click to expand...
Click to collapse
nice to see that im not alone but unfortunately for me the problem is im unable to get a fix most of the time but when i do it took a minimum of 8 minutes to get a solid 1 and worst of all it remains even after fully downgraded to stock lollipop and clean wipe via kdz method.. below is a screenshot of my gps status
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"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
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I will post a fix today, with screenshots and photos of the actual fix that I've done. Stay tuned
The Google API uses something called a "fused" location, which uses a combination of GPS coordinates, network info, and wifi IP. It determines which is the most accurate and delivers that location to the app.
With that said, I have had zero issues on marshmallow ROMs with the actual GPS signal, nor the fused API. Install an app like GPS Status & Toolbox which will detail the actual GPS signal you are getting from each satellite, if any, as well as a fix if you have one. Also, using that app, download the A-GPS assistance file.
If you are getting zero signals from any satellites, it could either be the ROM or a hardware issue. If that's the case, try another marshmallow ROM like the Resurrection Remix ROM. If no luck there, have you done any mods to the internals of the phone? For instance, many users have reported issues after putting thermal paste on the SoC chip for a cooling mod. The thickness of the paste prevents the GPS antenna pins from making contact. Good luck!
So,
1) disassemble your lg g3
2) take out the upper plastic part that contains the on/off and volume buttons.
3) scratch the 2 pins (near my cutter) and also the 2 pins on the plastic part (the 2 pins on the upper left)
4) cut a 3x3mm cartboard and place them under those 2 pins (like in the image - the 2 white pieces)
5) put back everything
6) optional => root + change the gps config file (NTP) . You can use FasterGPS app from playstore.
Before I did this , I was outside in my garden, and I have used the Gps Test app.
There were just 2 or 3 sattelites found, and everytime it didn't lock my position.
After the tutorial that I have given to you, in the same place, I have the reception like in the picture
Hope you liked it
gbb14 said:
So,
1) disassemble your lg g3
2) take out the upper plastic part that contains the on/off and volume buttons.
3) scratch the 2 pins (near my cutter) and also the 2 pins on the plastic part (the 2 pins on the upper left)
4) cut a 3x3mm cartboard and place them under those 2 pins (like in the image - the 2 white pieces)
5) put back everything
6) optional => root + change the gps config file (NTP) . You can use FasterGPS app from playstore.
Before I did this , I was outside in my garden, and I have used the Gps Test app.
There were just 2 or 3 sattelites found, and everytime it didn't lock my position.
After the tutorial that I have given to you, in the same place, I have the reception like in the picture
Hope you liked it
Click to expand...
Click to collapse
Thanks for the advice, will try it tomorrow. I was having same issue and I changed the gps.config to match my NTP and also I went to the APN and under APN Type I added agps (like this: default,supl,apn). Now I'm having better reception.
AlwaysLucky said:
The Google API uses something called a "fused" location, which uses a combination of GPS coordinates, network info, and wifi IP. It determines which is the most accurate and delivers that location to the app.
With that said, I have had zero issues on marshmallow ROMs with the actual GPS signal, nor the fused API. Install an app like GPS Status & Toolbox which will detail the actual GPS signal you are getting from each satellite, if any, as well as a fix if you have one. Also, using that app, download the A-GPS assistance file.
If you are getting zero signals from any satellites, it could either be the ROM or a hardware issue. If that's the case, try another marshmallow ROM like the Resurrection Remix ROM. If no luck there, have you done any mods to the internals of the phone? For instance, many users have reported issues after putting thermal paste on the SoC chip for a cooling mod. The thickness of the paste prevents the GPS antenna pins from making contact. Good luck!
Click to expand...
Click to collapse
I've not modded the internals of my phone, however, I disassembled it to unbrick it as I had hard bricked it. I'l try out the app as well. Thank you!
gbb14 said:
So,
1) disassemble your lg g3
2) take out the upper plastic part that contains the on/off and volume buttons.
3) scratch the 2 pins (near my cutter) and also the 2 pins on the plastic part (the 2 pins on the upper left)
4) cut a 3x3mm cartboard and place them under those 2 pins (like in the image - the 2 white pieces)
5) put back everything
6) optional => root + change the gps config file (NTP) . You can use FasterGPS app from playstore.
Before I did this , I was outside in my garden, and I have used the Gps Test app.
There were just 2 or 3 sattelites found, and everytime it didn't lock my position.
After the tutorial that I have given to you, in the same place, I have the reception like in the picture
Hope you liked it
Click to expand...
Click to collapse
Thank you for such an extensive post detailing everything. Will surely try it out!
napster_nagrath said:
I've not modded the internals of my phone, however, I disassembled it to unbrick it as I had hard bricked it. I'l try out the app as well. Thank you!
Click to expand...
Click to collapse
Ah, well that could certainly be a lack of contact with the GPS antenna pins. If you can reassemble the G3 again properly with no mods, there is no need to bend the pins (with cardboard or anything else as mentioned by others). That would be addressing the symptom, instead of the cause. The specifications of the G3 allow the pins to easily make contact if everything is in it's place and tightened correctly. When reassembling, I also recommend re-applying blue Loc-Tite on the threads on all of the screws like the manufacturer did to help keep the screws tightened. I personally have modded two G3's with 1mm thermal pads on the SoC, and I still have had no issues with pin contact and have had an excellent GPS signal with a average 6 second fix. Let us know how it goes.
Unfortunately none of the above work for me @AlwaysLucky @arys64 . I tried all the apps and I also put a piece of cardboard under the pins. The GPS Status keeps saying "Waiting for Location".
napster_nagrath said:
Unfortunately none of the above work for me @AlwaysLucky @arys64 . I tried all the apps and I also put a piece of cardboard under the pins. The GPS Status keeps saying "Waiting for Location".
Click to expand...
Click to collapse
Oh man, super bummer. It may not be a pin contact issue then. What ROMs have you tried so far? GPS Status "waiting for location" simply means it does not have a fix yet, but it should have a small readout of the signal you are getting from each satellite. (you can get signals from satellites without getting a fix). Post a screen pic of GPS Status for me, if you wouldn't mind.
AlwaysLucky said:
Oh man, super bummer. It may not be a pin contact issue then. What ROMs have you tried so far? GPS Status "waiting for location" simply means it does not have a fix yet, but it should have a small readout of the signal you are getting from each satellite. (you can get signals from satellites without getting a fix). Post a screen pic of GPS Status for me, if you wouldn't mind.
Click to expand...
Click to collapse
I've tried Fulmics 4.2, Limitless 1.0 and Limitless 3.0.
I've attached the screen from the app.
napster_nagrath said:
I've tried Fulmics 4.2, Limitless 1.0 and Limitless 3.0.
I've attached the screen from the app.
Click to expand...
Click to collapse
Well, the number of satellites look average, but they simply aren't getting barely a signal if any at all. If you are sure you have ruled out the ROM as an issue, which it looks like you have, I'd have to say it's a hardware issue. Either your antenna is busted or the GPS receiver chip itself is failing. To me, it looks like the antenna. But if you have confirmed the pins are making contact okay, I'm simply... stumped. Sorry I couldn't be of more help, and my last suggestion would be to triple check those pins are not bent sideways and are still properly soldered to the board and making contact with the antenna. Good luck. :fingers-crossed:
AlwaysLucky said:
Well, the number of satellites look average, but they simply aren't getting barely a signal if any at all. If you are sure you have ruled out the ROM as an issue, which it looks like you have, I'd have to say it's a hardware issue. Either your antenna is busted or the GPS receiver chip itself is failing. To me, it looks like the antenna. But if you have confirmed the pins are making contact okay, I'm simply... stumped. Sorry I couldn't be of more help, and my last suggestion would be to triple check those pins are not bent sideways and are still properly soldered to the board and making contact with the antenna. Good luck. :fingers-crossed:
Click to expand...
Click to collapse
Yeah no worries. I'll try and see what can be done. Cheers.
napster_nagrath said:
Yeah no worries. I'll try and see what can be done. Cheers.
Click to expand...
Click to collapse
Hey there, a friend of mine was having a similar issue to yours and said he had to flash a different radio for his GPS to get a fix, which is sometimes included the ROM, and sometimes not. You might want to give that a shot?
AlwaysLucky said:
Hey there, a friend of mine was having a similar issue to yours and said he had to flash a different radio for his GPS to get a fix, which is sometimes included the ROM, and sometimes not. You might want to give that a shot?
Click to expand...
Click to collapse
Nah I tried them all. No luck.
gbb14 said:
So,
1) disassemble your lg g3
2) take out the upper plastic part that contains the on/off and volume buttons.
3) scratch the 2 pins (near my cutter) and also the 2 pins on the plastic part (the 2 pins on the upper left)
4) cut a 3x3mm cartboard and place them under those 2 pins (like in the image - the 2 white pieces)
5) put back everything
6) optional => root + change the gps config file (NTP) . You can use FasterGPS app from playstore.
Before I did this , I was outside in my garden, and I have used the Gps Test app.
There were just 2 or 3 sattelites found, and everytime it didn't lock my position.
After the tutorial that I have given to you, in the same place, I have the reception like in the picture
Hope you liked it
Click to expand...
Click to collapse
I think those are the wrong pins. If I remember correctly they are used for Cellular diversity antenna.
The correct pins are shown in http://forum.xda-developers.com/lg-g3/help/d855-gps-fix-possibly-t3450046
(see service manual for details)
Related
My GPS cant work..ill have tried the gps status app, reflash stock rom, changing the radio and many more but there no respond... And i also have bug which is my trackpad always scroll down..its annoy me wich i already have a great rom from revolutionary v 3.0...i hope someone expert can help me to solve this problem before i send it to repair center...i dont weather its hardware or software problem...
Molongest said:
My GPS cant work..ill have tried the gps status app, reflash stock rom, changing the radio and many more but there no respond... And i also have bug which is my trackpad always scroll down..its annoy me wich i already have a great rom from revolutionary v 3.0...i hope someone expert can help me to solve this problem before i send it to repair center...i dont weather its hardware or software problem...
Click to expand...
Click to collapse
Me too. Having a gps problem right now. What rom u using?
Runnymede AIO V6.0.4.3 S.E
Baseband 32.56.00.32U_5.17.05.23
When using gps status apk..my gps status always in spinning icon that i guess it hardware failure..but i see the gps of desire is in snapdragon chipset..is that possible..so how to repair this problem..or anywork around as i need my gps for my work...any expert member please help me..i also don't know if the system detect my gps hardware..
Install Z-Devicetest from the market and start it.
If the GPS hardware is dead Z-Devicetest will have a red X in the GPS box. If it shows a green check, click on GPS. If NMEA data scrolls, your GPS antenna is likely the problem.
I had a similar issue with my wife's GPS. Eventually it would never see any satellites under GPS Status.
I fixed it by opening up the phone and making sure all GPS connections were good. If you are reasonably handy you can follow these instructions to dismantle the phone:
http://www.youtube.com/watch?v=sXZqIjtFoAU
The GPS antenna is shown at 2:47 (it has a connector at both ends - make sure that both are snapped into place).
But before you disassemble the phone that far, at 1:49 in the video ("Remove the antenna") try the following: when you have removed the antenna you will see several copper contacts (similar to the two vibrator contacts highlighted in the attached photo). I seem to recall there were 4 copper contacts under that antenna cover. Gently bend the contacts slightly upwards - this will either ensure better contact or (as with my phone) re-establish contact. To remove the antenna is very quick.
In my case, GPS is incredibly strong after this procedure - 10 seconds max. to GPS lock inside the house.
Thank for your solution..but i found my gps antenna is missing so how to find it or replace it...
Are you saying the GPS antenna as shown at 2:48 in the video is not present?
The attached photos all highlight the antenna.
If it is really missing - which seems unlikely - perhaps the GPS antenna cable from the HD2 might work:
http://www.ebay.com/itm/OEM-HTC-HD2...ccessories&hash=item20c2bf50bc#ht_1761wt_1037
http://www.ebay.com/itm/OEM-HTC-HD2...ccessories&hash=item4cfeabdcb9#ht_2413wt_1270
Yes..the cable is missing...so i gonna try to replace it..thanks for the information!!
Thanks
Thanks rete! Your advice worked. Open up my phone, made sure gps antenna was firmly in place at both ends, pulled up the other connectors you mentioned, closed the phone, booted up and it found five satellites instantly.
Really, thanks a lot man. I no longer need to consider upgrading to a newer phone!
Extremely grateful! I had two HTC desire´s and I had repaired the headphone jack in both of them and was going mad as to why the GPS wasn't working.
I've read just about every post in this forum that even mentions GPS trying to find a solution, but no luck, so I'm asking outright in case I missed something or someone has the answer and hasn't contributed it yet.
My One X has horrible GPS.
I'm not talking about how long it takes to find satellites, it does that quickly enough. What I'm talking about is using an app like My Tracks, Endomondo, Run Keeper, etc to record a track. If I sit the phone perfectly still and let one run, the position and track wander all over the map like a drunken sailor looking for a good time. If I actually move in a straight line, the position shows me blocks away from where I really am. If I try to use a navigation app, the directions are meaningless because the phone thinks I'm as much as 1/2 mile away from my actual position. (I should post a video of that, it's hilarious how bad the directions are.)
Please don't respond if the only problem you've had with GPS is that it took too long to find satellites and downloading someone's aGPS fix app or tweak solved your problem. I've tried all that, multiple times.
I suspect it's just bad hardware, maybe bad antenna connection or something similar, and I'm going to need to replace the phone, but before i go through the hassle of trying to get HTC to replace this dev unlocked phone, I want to make sure there's not a software fix possible. I'm past Expansys' 14 day return window, so HTC is my only option, or possibly my American Express warranty service.
Any thoughts?
The pic is a screen capture of the phone sitting in my parked car in an uncovered parking lot for about 10 minutes. Note how much it wanders around.
Well, no replies, so I guess that means a big NO to any one actually finding a software fix to this particular problem.
For what it's worth, I installed CM9 in the phone and the GPS is still unable to hold an accurate location, so I'm sure it's a hardware issue at this point.
That's a real pisser, since they told me the turn around time on fixing my phone will be 3-4 weeks at the HTC Warranty Repair center in Houston, TX.
Sent from my Galaxy Nexus using Tapatalk 2
I hate to say it, but it must be your unit.
I use GPS navigation very frequently (SoCal, USA) - and coming from a flawless GPS on SGSII, I have to say that HOX GPS is even better. It's more precise - it can even correctly show which side of the road I'm on. Also, driving past intersections is spot-on, which shows how on-the-spot it is.
Did you install any cases, or keep it somewhere where antenna signal may get blocked?
DarkDvr said:
I hate to say it, but it must be your unit.
I use GPS navigation very frequently (SoCal, USA) - and coming from a flawless GPS on SGSII, I have to say that HOX GPS is even better. It's more precise - it can even correctly show which side of the road I'm on. Also, driving past intersections is spot-on, which shows how on-the-spot it is.
Did you install any cases, or keep it somewhere where antenna signal may get blocked?
Click to expand...
Click to collapse
I didn't want to believe it, but I concur it's got to be a hardware issue. No case in it, nothing blocking the antenna. I have same issues even laying it on a patio table out in the open.
I'm also in SoCal...San Fernando valley and the west side of Los Angeles. The one time I tried to use the GPS for navigation it was like getting affections from the three stooges.
Sent from my Galaxy Nexus using Tapatalk 2
Mine does exactly the same. Calibrating the compass an turning wifi off while using gps solves it for me. Gsp is spot on whe wifi turned off... turn it on while navigating and it wonders off road....
I had the same problem, I downloaded GPS Test Plus from the Market, went into settings, selected Clear AGPS and then selected Update AGPS - seems to have been tons better since I did that.
Found this via an Internet search so Kudos to those who discovered it although I apologise I can't remember where I found it!
breugiek said:
Mine does exactly the same. Calibrating the compass an turning wifi off while using gps solves it for me. Gsp is spot on whe wifi turned off... turn it on while navigating and it wonders off road....
Click to expand...
Click to collapse
Yop this I remember even from the iPhone. Accuracy +50m when Wifi or Mobile network assisting with the position. Without max 5 . and not much wandering
Just turn it off in the location. As the breugiek above me suggested.
Thanks for the responses.
As stated in the original post, this is not an aGPS issue. I've tried many aGPS type fixes..Faster fix app, crypted fix and a few others.
I didn't mention it, but I've already tried turning of wifi; it makes no difference.
I suspect bad hardware, specifically something wrong with the antenna.
Annoys me no end to be HOX-less for a month. I've only owned the damn thing for 4 weeks.
Sent from my Galaxy Nexus using Tapatalk 2
Kinda meant the settings > location > Googles location service = un-check. But I guess you already tried that one :/ (but mentioning it just in case)
PAGOT said:
Kinda meant the settings > location > Googles location service = un-check. But I guess you already tried that one :/ (but mentioning it just in case)
Click to expand...
Click to collapse
Yeah, tried that too, but thanks for the follow up.
Sent from my Galaxy Nexus using Tapatalk 2
I'd posted a wandering track from a parked vehicle in the OP, but for those interested, here's a two-minute video of the HTC One X GPS in action while trying to use it for Navigation with the Google Navigation app.
http://youtu.be/_nxptMIPuIE
Mine is the same but only when I stop the car at lights etc. Sat nav shows me going rallying across field and drowning in the sea when near the coast, sorts itself out when on the move again tho.
Sent from Bindroid
I may have found a fix (it works for me so far anyway) - see my post here...
http://forum.xda-developers.com/showpost.php?p=27266275&postcount=145
Thanks for the suggestion, I've already seen your post in the other GPS is messed up thread. I tried it and it doesn't fix my phone. Clearly bad hardware.
Cheers!
Sent from my HTC One X using Tapatalk 2
GPS now working fairly well on this phone. It's not perfect, and requires WiFi off, but other than some initial wandering at startup I'm getting accurate tracks on it.
The fix was to install ARHD 7.0. No idea what changed from earlier versions but it works well enough to put up with until I can get a shorter repair time quote from the warranty center.
Sent from my HTC One X using Tapatalk 2
Hi.
Some time ago I broke screen of my Desire Z and gave it in for repair. Repairmans change the screen, and now it works perfectly, but my GPS stop works at all. If I use google maps or GPS test or other application, what use GPS, icon of GPS connect blink, but program don't see satellites at all (one time, however, after long time "GPS fix" program saw 2 of them, but did not write any other information). I try 3 firmware ( 2.1.13 MIUI on android 2.3, last MIUI on android 4 and last Mimicry) and try SuperWipeG2 without any effect. Repairman told what he don't do anything to damage GPS.
I want to ask, can it be due to bad connection with cable or bad connection with GPS antenna, or I need full GPS repair? And where I can get scheme of Desire Z modules to fix it manually, if problem only in bad connection?
did you try another radio?
d_gkal said:
did you try another radio?
Click to expand...
Click to collapse
No, but I try some firmwares - I think in different firmwares radio is different. I'm wrong?
Solution
Okay, I understood root of problem and fix the phone manually. Because I don't find solution in internet, write it here. Remove the cover, holding by 3 T5 screw. On reverse side of cover you can see 3 yellow plates (probably made of copper). It's GPS antenna. At the appropriate places in the motherboard you can see small legs, 2 legs on each plate. Carefully bend them with tweezers in the opposite motherboard. They need to touch the plates when closing the case. That's all, you GPS is working now.
bravchik said:
Hi.
Some time ago I broke screen of my Desire Z and gave it in for repair. Repairmans change the screen, and now it works perfectly, but my GPS stop works at all. If I use google maps or GPS test or other application, what use GPS, icon of GPS connect blink, but program don't see satellites at all (one time, however, after long time "GPS fix" program saw 2 of them, but did not write any other information). I try 3 firmware ( 2.1.13 MIUI on android 2.3, last MIUI on android 4 and last Mimicry) and try SuperWipeG2 without any effect. Repairman told what he don't do anything to damage GPS.
I want to ask, can it be due to bad connection with cable or bad connection with GPS antenna, or I need full GPS repair? And where I can get scheme of Desire Z modules to fix it manually, if problem only in bad connection?
Click to expand...
Click to collapse
even i am having the same problem with my phones gps.... still trying to figure out ...
---------- Post added at 10:57 AM ---------- Previous post was at 10:11 AM ----------
bravchik said:
Okay, I understood root of problem and fix the phone manually. Because I don't find solution in internet, write it here. Remove the cover, holding by 3 T5 screw. On reverse side of cover you can see 3 yellow plates (probably made of copper). It's GPS antenna. At the appropriate places in the motherboard you can see small legs, 2 legs on each plate. Carefully bend them with tweezers in the opposite motherboard. They need to touch the plates when closing the case. That's all, you GPS is working now.
Click to expand...
Click to collapse
Hey bro your are awesome outstanding where did u learn this? my gps was not working tried full wipe super wipe many other thing but no luck.. i just did what you said and i got satellite in 5 seconds.. hey i really dont know how to thanks you man you are just awesome..... :good: :good: :good: :good: :good: :good: :good: :good: :good: :good: :good: :victory: :victory: :victory: :victory: :victory: :victory: :victory: :victory: :victory:
---------- Post added at 11:06 AM ---------- Previous post was at 10:57 AM ----------
bravchik said:
Hi.
Some time ago I broke screen of my Desire Z and gave it in for repair. Repairmans change the screen, and now it works perfectly, but my GPS stop works at all. If I use google maps or GPS test or other application, what use GPS, icon of GPS connect blink, but program don't see satellites at all (one time, however, after long time "GPS fix" program saw 2 of them, but did not write any other information). I try 3 firmware ( 2.1.13 MIUI on android 2.3, last MIUI on android 4 and last Mimicry) and try SuperWipeG2 without any effect. Repairman told what he don't do anything to damage GPS.
I want to ask, can it be due to bad connection with cable or bad connection with GPS antenna, or I need full GPS repair? And where I can get scheme of Desire Z modules to fix it manually, if problem only in bad connection?
Click to expand...
Click to collapse
look at this video how to open back panel http://www.youtube.com/watch?v=b9S7k1OJalM once you take off the panel at the right side middle you will see to copper plates Carefully bend them with tweezers in the opposite motherboard while closing that legs should touch the back panel do as
bravchik told thanks to him for letting us know the fix cheers
Hey guys i have noticed since replaacing my screenmy gps wasnt working great and now not at all.....
I have tried faster fix
I have tried 2 different roms
I have opened the back up and checked the connecting pins
I have tested the 3 antennas on the top plate with my multi meter all have connectivity
Anyone any other ideas?.....
goofylad said:
Hey guys i have noticed since replaacing my screenmy gps wasnt working great and now not at all.....
I have tried faster fix
I have tried 2 different roms
I have opened the back up and checked the connecting pins
I have tested the 3 antennas on the top plate with my multi meter all have connectivity
Anyone any other ideas?.....
Click to expand...
Click to collapse
Anyone????
goofylad said:
Anyone????
Click to expand...
Click to collapse
You've done all of the diagnostic steps I would start with. In the GPS Status app, is your fix/sats ratio 0/0? Or does it at least show satellites like 0/22?
The symptoms you are describing point towards lack of pin contact. I know you checked them already, but it's extremely difficult to tell if the pins are actually making contact once you screw the back of the phone back on. I had this issue once, but found that simply tightening the screws as much as possible without stripping them did the trick. Others who had this issue resolved it by slightly bending the pins higher so they make contact easier.
If you are 100% certain they are making contact, I have no idea what would cause it, considering all of the diagnostic steps you have already taken. If GPS status shows satellites but 0 are fixed, I'm 99% certain it's the pins not making complete contact.
I hope that helps. Good luck, and let me know how it goes.
PS: Make sure the ROMs you are testing with are confirmed to be working with GPS. If you want to rule out custom ROMs as a cause, use a stock ROM.
Hello there,
My Flo-Device keeps locking me out, resulting in a short black screen and throwing me back to the lockscreen. Based on the behaviour it seems that this is related to the sensor that is use for magnetic cases.
Unfortunately, I never used such a case, most threads I found are talking about cheap cases with a poor placing of the magnet itself - which does not help me out here.
Any hints on overriding that sensor by software or hardware? Any way of fixing the sensor or even a hint on the location on the Motherboard? I have read about an exposed module disabling it, but to configure the module it may be neccesary to be able to use the tablet in the first place. Currently it is still completely stock.
I appreciate your help or any reference to a solution that I may have overseen in my search. Thanks!
AeroplaneMode said:
Hello there,
My Flo-Device keeps locking me out, resulting in a short black screen and throwing me back to the lockscreen. Based on the behaviour it seems that this is related to the sensor that is use for magnetic cases.
Unfortunately, I never used such a case, most threads I found are talking about cheap cases with a poor placing of the magnet itself - which does not help me out here.
Any hints on overriding that sensor by software or hardware? Any way of fixing the sensor or even a hint on the location on the Motherboard? I have read about an exposed module disabling it, but to configure the module it may be neccesary to be able to use the tablet in the first place. Currently it is still completely stock.
I appreciate your help or any reference to a solution that I may have overseen in my search. Thanks!
Click to expand...
Click to collapse
Hall effect sensor's location is on the first attachment. I can assure you that there is no need to fix it directly because this and many other sensor problems are caused by the LCM connector. Disconnect the battery and just re-seat the LCM connector but be careful, watch this first https://www.youtube.com/watch?v=C9PwK9eGrCY
k23m said:
Disconnect the battery and just re-seat the LCM connector
Click to expand...
Click to collapse
Thanks for the fast reply and for pointing out the sensors' location on the PCB. Unfortunately, this did not solve the problem. Do you have any other ideas?
AeroplaneMode said:
Thanks for the fast reply and for pointing out the sensors' location on the PCB. Unfortunately, this did not solve the problem. Do you have any other ideas?
Click to expand...
Click to collapse
Please also re-seat the other end of LCM cable.
Check if a magnet placed over the sensor's position (top or bottom) has any impact.
Perhaps ROM builders know if something can be changed in /system/build.prop
Remove lock password - start ADB and do:
rm /data/system/locksettings.db
rm /data/system/*.key
Finally, we'll consider a hardware mod.
:good:
I already reseated both end of the ribbon cable to be sure - and again after the first unsuccessful test run. I never used a magnetic case on the device and there ar no other magnets near - my other Nexus 7 is fine though
What exactly does the locksettings.db do? I deleted It and rebooted, but no change in behaviour.
btw, as I am unable to properly use the touchscreen, I tried to enable usb debugging via an usb-otg cable and an attached mouse - which worked fine so far. It seems that there might be some interference or mechanical problem. Maybe the first thought with the hall sensor was wrong track I repaired a lot of devices over time, but (un)fortunately none of them showed that behaviour before, so I'm somewhat out of ideas in this case.
AeroplaneMode said:
What exactly does the locksettings.db do? I deleted It and rebooted, but no change in behaviour.
....
I repaired a lot of devices over time, but (un)fortunately none of them showed that behaviour before, so I'm somewhat out of ideas in this case.
Click to expand...
Click to collapse
It removes the lock password and makes it go into LOCKSCREEN-NONE mode, but you have to also remove all files with the ".key" extension from the folder.
Since you repair such devices, then measure voltage on the output pin of the sensor, and measure it again with a magnet over it.
Good idea. Without the magnet I get 2.98 V and with the magnet 0.001 V between GND and out. So I guess the sensor itself may not be the problem? As I recognized that it might be a mechanical problem, I got a friend to use the touchscreen and measured output at the sensor again, it seems to work as intended.
As the lockscreen does not have any further protection set up after a factory reset, I guess this could be the reason that I did not find any *.key files in that directory? So currently it is just 'swipe to unlock'.
Problem with the lockseetings file is: The device is all stock, locked and has no root - and to get a bit more weird, is not recognized when in recovery. My other Nexus 7 with twrp already on it is recognized instantly. I may have to fix that first, as in a weak moment I may have overseen the "access denied" while trying to delete that file and already typing the nex command. My bad - it was already late.
Honestly, I wonder what the problem really is and really appreaciate your help so far.
AeroplaneMode said:
Good idea. Without the magnet I get 2.98 V and with the magnet 0.001 V between GND and out.
.....
As the lockscreen does not have any further protection set up after a factory reset, I guess this could be the reason that I did not find any *.key files in that directory? So currently it is just 'swipe to unlock'.
.........
Problem with the lockseetings file is: The device is all stock, locked and has no root - and to get a bit more weird, is not recognized when in recovery.
Click to expand...
Click to collapse
The sensor is OK indeed.
As you did factory reset, there is no issue of user data loss anymore, so just unlock it and do factory flash https://developers.google.com/android/images
This should fix the recovery recognition problem too.
Yeah, so I unlocked it, reflashed it with the stock rom, installed twrp and su...and finally got to delete the mentioned files. But still - the issue continues to exist. Also, I see no difference after deleting the files. Does something else prevent that no locksreen-mode?
Do you have any more ideas? I could wildly start changing parts, but unfortunately the device isnt worth that much anymore :-/ As mentioned, using the device with the Mouse hooked up via otg, the screen behaves normal.
AeroplaneMode said:
the issue continues to exist. Also, I see no difference after deleting the files. Does something else prevent that no locksreen-mode?
....
Do you have any more ideas?
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Click to collapse
No worries, we'll fix it, but it seems that my opening statement "this and many other sensor problems are caused by the LCM connector" still holds true. On the schematic, R150 and R151 are presumably located next to the sensor on the daughterboard, so if LCM cable connection to main mobo is open, the CPU will constantly sense 0V level, right? And as you measured earlier, 0V means that magnetic flux is detected. Now, about the ribbon cable... you did re-seat it, but this thing is awful and tends to fail repeatedly because of contact oxidation and weak connector lock pressure. Two solutions:
spray with https://www.amazon.com/CRC-5103-Quick-Electronic-Cleaner/dp/B000BXOGNI/
apply a thick tape/spacer over the lock so N7's back cover will add extra pressure on it
Finally, here is a brute-force workaround fix, go: settings - system profiles - default - lock screen - disable :highfive:
I'll test the points you mentioned.
I have to get a can of cleaning spray in the workshop, as I only have other fluids here which leave a oily coating. Or Brake Cleaner Fluid Thanks so far, I'll keep you updated.
Disabling the Lockscreen still gives me blackouts but okay, i dont have to swipe anymore - that will do for the moment. I haven't had similar problems in a while, so I tend to forget some points as repairing phones from time to time is only some sort of occupational therapy for me besides my other work ^^
k23m said:
[*]spray with https://www.amazon.com/CRC-5103-Quick-Electronic-Cleaner/dp/B000BXOGNI/
[*]apply a thick tape/spacer over the lock so N7's back cover will add extra pressure on it
Click to expand...
Click to collapse
I was finally able to continue here. I cleaned the connection and applied some tape to thicken up the spacers. Still, I am not able to resolve the problem. I also tried to manually apple more pressure on the back, still not getting better unfortunately.
AeroplaneMode said:
I was finally able to continue here. I cleaned the connection and applied some tape to thicken up the spacers. Still, I am not able to resolve the problem. I also tried to manually apple more pressure on the back, still not getting better unfortunately.
Click to expand...
Click to collapse
I know you're not happy about it but this is the best N7 hardware issue to resolve we've had so far this year
I opened up my N7 to check the sensor's connection to main PCB - it goes to LCM pin #41 - note the attached pictures. Disconnect the battery and use an ohmmeter to measure the two points - I get around 8 oHm. If you measure open circuit, then look for broken or corroded track somewhere along the way. If you measure proper connection, then the problem is on the motherboard and there is nothing else we can do - case closed unfortunately.
/EDIT
Here is a software workaround:
install ElementalX kernel
during installation select the "Disable magnetic cover on/off" option
:victory:
k23m said:
I get around 8 oHm.
Click to expand...
Click to collapse
I get 3 Ohms, so I flashed the suggested Kernel. It seems to solve the problem, won't get any better I guess. Thanks for your support!
k23m said:
I know you're not happy about it but this is the best N7 hardware issue to resolve we've had so far this year
Click to expand...
Click to collapse
Now is that a good thing? :silly: