Database Users

Fingerprint sensor stopped working

So, I took delivery of my G4 plus less than ten days ago.
Everything worked fine, except that the fingerprint sensor occasionally acted up. It would often fail to recognise my fingerprint, about one out of every ten scans; but i assumed that my dry skin had something to do with it.
Today morning, upon waking up, I noticed the phone had become unusually hot and switched it off for the first time in nine days. When I turned it on again, the fingerprint sensor was totally dysfunctional.
I tried unlocking with the sensor. No luck. Forget sensing my finger, it wouldn't even vibrate to indicate that an input was detected.
Tried searching for fingerprint sensor in settings. No luck.
Dialed *#*#2486#*#* for CQATest. Attempting to open the fingerprint sensor section resulted in an FC.
Performed a factory reset. Back to square one, still no fingerprint sensor. Initial setup wizard simply behaved like the phone has no fingerprint sensor.
All subsequent attempts to get it to work have failed.
I've been using pattern unlock, and while everything else works fine, the sensor seems to be unrecognized by the phone.
My guess is that it's a hardware issue, but I'm baffled by what caused it. I've been extra careful, never dropped it even on a bed. No water contact. It's stock, no sideloaded apps installed and bootloader untouched.
Google searches proved useless, as did a thorough search of XDA, Moto's forums and a subsequent call to Moto customer care.
Would anyone happen to have a solution? I've requested a replacement from Amazon, but it would be nice to have a quick solution handy if this issue crops up again in future.
Thanks!

check whether in the security settings you get a fingerprint settings. if not search in the settings searchbar for fingerprint. if nothing worked try installing a applock "applock" and try to enable fingerprint within them and try to unlock. an important thing is this one, try using a full screen app of your choice and tap fingerprint sensor. if it opens the softkeys your mobile is messed up with software, if it didn't open the softkeys then the mobile is messed with hardware. cheers

Karthik_pm said:
check whether in the security settings you get a fingerprint settings. if not search in the settings searchbar for fingerprint. if nothing worked try installing a applock "applock" and try to enable fingerprint within them and try to unlock. an important thing is this one, try using a full screen app of your choice and tap fingerprint sensor. if it opens the softkeys your mobile is messed up with software, if it didn't open the softkeys then the mobile is messed with hardware. cheers
Click to expand...
Click to collapse
All these done already, except for app lock. Nothing worked. Hardware problem it is, I've initiated a replacement from Amazon.
Cheers

Same problem sir....so wht ll i do now...no fingure print setup in my moto g4 plus.
...plz help sir

Cul Rubul said:
Same problem sir....so wht ll i do now...no fingure print setup in my moto g4 plus.
...plz help sir
Click to expand...
Click to collapse
If the phone is still within the replacement window, get it replaced. Otherwise, you can:
1. Get it repaired at a Moto service centre if within warranty period (that way you won't lose warranty)
2. Get it repaired at a local service centre (only if warranty has expired and Moto is charging higher for the repair)
Sent from my Moto G4 Plus using XDA Labs

Samsung Galaxy S4 GT-I9505 Screen stays black after i type my PIN

Hello recently i had an issue with my proximity sensor it was stucked at 0 cm
until it felt down and then worked for a little time but then stopped again
So i decide to dissasembly it and clean the sensors and everything ( i blowed air and used a tooth brush too)
when i assembled everything back i booted on recovery to make a clean install of my rom
everything was going well until i booted the phone and after i typed my PIN code and drag the screen up to unlock it
then suddenly screen goes black and only turned on when someone calls me.
When im pressing the power/lock or home button always playing the lock sound.
Tried everything, i tried to boot the phone without each sensor but always doing the same thing
I tried to disscharge the phone, pulling of the battery and keep power button pressed for 1 minute but again the same thing
The phone is working well in TWRP (touchscreen) , Can someone explain to me what happend?
Also when someone calls me the proximity sensor is working well.
Running Mokee ROM android 6.0 but i tried to recover back to s4's official backup and the cyanogen release 5.1 but also got the same problem

I think its the proximity sensor could it be?

Is something wrong with my post? maybe i wrote too many and no1 reads it ? or no1 have seen this before?
Anyways i need help so much, i cant call anyone i cant read texts i cant do anything and i cant buy another one

It could be a hardware or software issue. Did you try to find a way to completely disable the proximity sensor in the ROM?
Was the phone dropped? Any loose connections in the phone?

Does this happen if you flash ROMs other than Mokee, for example, Cyanogenmod?

audit13 said:
It could be a hardware or software issue. Did you try to find a way to completely disable the proximity sensor in the ROM?
Was the phone dropped? Any loose connections in the phone?
Click to expand...
Click to collapse
No i couldnt find a way to disable the proximity in ROM and no the phone didnt dropped i will check for 100th time if any loose connections exists
but i dont think so, many times i try to unlock it and it doing some wierd thing like vibrating then it shuts down but without showing me anything.
Guys i think i damaged somehow the mainboard but i didnt do something so hard to damage something can i damage something with a tooth brush??
Strephon Alkhalikoi said:
Does this happen if you flash ROMs other than Mokee, for example, Cyanogenmod?
Click to expand...
Click to collapse
Yea i tried, as i said, the recovery backup from the stock rom, and also the cyanogen release 5.1 i dont remeber i think it was cyanogen 12.1 anyways it does the same thing.
The phone doesnt function properly.
Is there any ROM that it has only the basics calls text etc so i can try ?

chrisfy said:
Yea i tried, as i said, the recovery backup from the stock rom, and also the cyanogen release 5.1 i dont remeber i think it was cyanogen 12.1 anyways it does the same thing.
The phone doesnt function properly.
Is there any ROM that it has only the basics calls text etc so i can try ?
Click to expand...
Click to collapse
No, because the firmware isn't the problem. Your proximity sensor I believe is screwed up, probably from using a toothbrush on it and scratching the sensor. While I'm curious as to where you saw or heard that bit of advice since toothbrushes are abrasive, it's not really relevant.
Replace the proximity sensor.

Strephon Alkhalikoi said:
No, because the firmware isn't the problem. Your proximity sensor I believe is screwed up, probably from using a toothbrush on it and scratching the sensor. While I'm curious as to where you saw or heard that bit of advice since toothbrushes are abrasive, it's not really relevant.
Replace the proximity sensor.
Click to expand...
Click to collapse
Yea i thought in the begining that this is the problem but explain me why on call proximity works normal if i take the phone away from my ear screen on and if i get it back screen off simple normal.
Also i tried to boot the phone without the proximity connected on it and again it was doin the same thing and 1 more question does the proximity sensor have the possibility to lock the phone?
I really dont know what is going on propably i have to buy a new one i think
I used a tooth brush cause i didnt have anything else but i didnt put much pressure i just touched it
I must upload a video to show u whats exactly happening because its very stange i cant get to home screen with any way everytime it shuts the screen off
but if i choose to go to settings and get black screen when some1 calls and talk when i end the call it will show me the settings but if i try to get anywhere else i will get again black screen and when
some calls and end again the call it will show me that i was choosed before its so annoying really.
Forgive me for my bad english.

any suggestions?

Phone gets stuck on lockscreen with clock on blue tile

Hi there,
I migrated to LOS two weeks ago and I'm fairly happy with it. It runs really smoothly, however I think I have found a bug. From time to time when I wake up my phone it just shows the clock (with the correct time) on a blue tile. The phone seems to still be working as I can use the flashlight (by pressing and holding the pwr button when in sleepmode), but no matter what I do, I can't do anything useful. I'm stuck on that screen.
I haven't found out what causes this strange behavior.
All I can do is remove the battery and reboot.
Has anyone else come across this phenomenon and knows more than I do?
[Edit:]
Can't post the picture, as I don't have enough posts yet
[/Edit:]
Cheers
johntwenty

Update:
I had to go back to CM as the phone function didn't work.
I do like LOS 14.1 a lot, however all the features are of little use if people at the other hand can't hear me
So much for now. I'll probably try LOS again at a later time, when more of the issues are fixed.
Thanx
johntwenty

Alright,
I've gone back to LOS 14.1. and installed the most recent nightly build lineage-14.1-20170315-nightly-klte-signed.zip.
The phenomenon described above is still present, however, I noticed that if I hit the back button within one or two seconds, my phone will get back to normal. If I wait longer, there is no way to recover without removing the battery.
I hope that this information might help.
Cheers
johntwenty

Yes. Experiencing exactly this. sm-g900v, may 24th Klte.

It was one of the reasons why I've stopped using LOS.
I've read somewhere that you need to disable S-View Cover somewhere in the settings to get rid of this bug.
It was after reflashing to TW ROM, so I haven't tested this solution.

Thanks for feedback. via Google determined s view is flip cover. Completely disabled...see if it continues.

Yes, it's a special Samsung cover which I've never used.
I think that the phone should respond to its magnet.
Since I have no this cover, the phone could be "misled" by a magnet in my bag or something.

Haha...believe may have put it together. Have carried ecig (joytech vtc mini) along with phone in same hand with them touching each other. VTC mini has 2 small strong magnets on 18650 battery cover. It's only occurred half dozen times since using Lineage this last month and has not locked up lock screen since disabling flip cover.

Just one more reason not to smoke :lol

Hi All ,
Where is this S-view cover disable on Galaxy Note 3 please ?

Thanks for info 'flip cover' on setting disabled.

Just want to add that I had this problem again yesterday, after a long while, with Lineage 14.1-20171214-NIGHTLY-klte. Left it like this overnight, same in the morning.
I noticed that many things still work: bluetooth auto connects, sounds are played. Probably everything works except one cannot use the screen.
Connecting adb works, changing screen resolution changes the form of that color rectangle but doesn't help. Reboot via adb works (and I think the force reboot via Power+VolDown also works).

Hiano said:
Just want to add that I had this problem again yesterday, after a long while, with Lineage 14.1-20171214-NIGHTLY-klte. Left it like this overnight, same in the morning.
I noticed that many things still work: bluetooth auto connects, sounds are played. Probably everything works except one cannot use the screen.
Connecting adb works, changing screen resolution changes the form of that color rectangle but doesn't help. Reboot via adb works (and I think the force reboot via Power+VolDown also works).
Click to expand...
Click to collapse
I've had this issue today but noticed I had the S-View-Cover Option enabled. How about you?

bbsc said:
It was one of the reasons why I've stopped using LOS.
I've read somewhere that you need to disable S-View Cover somewhere in the settings to get rid of this bug.
It was after reflashing to TW ROM, so I haven't tested this solution.
Click to expand...
Click to collapse
Thank you so much for this info. Got the exact same problem on my HTC10 and turning the setting completely off in the settings solved it. I think the reed contact in my phone must be broken or sth... but at least I don't have to restart my phone every time it happens!

Shark5060 said:
Thank you so much for this info. Got the exact same problem on my HTC10 and turning the setting completely off in the settings solved it. I think the reed contact in my phone must be broken or sth... but at least I don't have to restart my phone every time it happens!
Click to expand...
Click to collapse
Me too! Galaxy S5.
Thanks for tips. I've just use neodymium magnet. I've moved on phone back and Android is usable again without rebooting!
I don't know why sometime phone thinks that cover is used. To many magnetic fields around?

Hi guys, I'm having the same problem with a Note 3 N9005. I installed TWRP 3.2.2.0 and then LineageOS 14.1. After booting the device I see for a second "next" , but the screen jumps too quickly to a blue tile with time and date. There it stucks. I got an ORIGINAL SAMSUNG flip-cover (the one with magnets, cover closed-> screen is off), but even with this thing installed it doesn't work. Same thing happens, blue tile and no responding to the flip cover at all. Disable S-view cover is not an option, as i can't get into the phone's OS at all.
How do i get into the phone's OS and settings? Does the trick with the magnet work for somebody?
Please, explain clearly how you got around this issue. Thanks in advance!

thaineth said:
Hi guys, I'm having the same problem with a Note 3 N9005. I installed TWRP 3.2.2.0 and then LineageOS 14.1. After booting the device I see for a second "next" , but the screen jumps too quickly to a blue tile with time and date. There it stucks. I got an ORIGINAL SAMSUNG flip-cover (the one with magnets, cover closed-> screen is off), but even with this thing installed it doesn't work. Same thing happens, blue tile and no responding to the flip cover at all. Disable S-view cover is not an option, as i can't get into the phone's OS at all.
How do i get into the phone's OS and settings? Does the trick with the magnet work for somebody?
Please, explain clearly how you got around this issue. Thanks in advance!
Click to expand...
Click to collapse
I always delete Flipflap as one of the first things I do on a fresh install. It seems to always act up for me. The trick with the magnet is to pass it across the screen in the area above the recents key, that should trip the smart cover off, then you can disable it in options, or remove the app completely if you have root.
EDIT: Sorry, just noticed you have a Note 3, these instructions are for s5, magnetic sensor may be in different spot on note 3

I was struggling to find the setting to turn off the S View cover on LineageOS 16 on my S5.
Found it in Settings > Connected devices > Connection preferences > Smart Cover
Turn it off via the toggle at the top!
We'll see how it goes! Thanks!

This is also apparently just bad design in Lineageos
for the S5 or whatever layer of software/firmware controls this, as this Blue Screen of Death disables power-button NMI forced reboots: if this happens on a fixed-battery phone, you get to wait until it goes flat, which is why I'll stick with the S5 forever.
Following the instructions, I found and disabled Smart Cover in Connection Preferences (many thanks to whoever figured this out); apparently Lineageos 16 ships with this enabled (bad design). I'd never even heard of a Smart Cover or knew the phone had a magnet gimmick like the tablets do.
One principle of software design which is not widely appreciated is that doing too much is often worse than not doing enough.

Phantom/ghost touch problem

my gf has a s7 edge international that has some weird touch issues as mentioned in the title. i can provide a youtube clip showing the issue but im not allowed to post links yet.
is this a known problem with this specific phone or has anyone been able to fix this?
edit: no screen protector on the phone.
thanks
zeMadCat

Would the phone protector be touching the screen and making the ghost touch?
Do you have enabled the "keep screen turned off" (prevent to touch accidentally while device is in a dark place or pocket or bag? Settings / Display / Keep screen turned off
Previous models had a glove sensitive touch option. With S7 with Nougat is now enabled by default. This means you can close your finger and not touch it but the display would detect your finger and create the action where your finger was pointing into.
I'm not that techy but providing assistance to get to root cause

still running 6.0.1, tried keep screen turned off enabled and disabled and tried w/o case. problems still

zeMadCat said:
still running 6.0.1, tried keep screen turned off enabled and disabled and tried w/o case. problems still
Click to expand...
Click to collapse
type *#2663# in the dialer, click on touch key fw update & TSP FW update (General).
check if this solves your problem

tried 2hrs ago. rebooted the phone to make sure, still no go.. she had another one that acted like this and she returned it and got this brand new from her carrier, if anyone needs the youtube link ill PM.
thanks for helping

i guess its not a common issue then?

A40 unable to fingerprint-lock after android-upgrade?

It's a small thing, but it bugs me in my daily use of my phone. I recently got my A40 and upgraded Android from 9 to 11, and now I can't lock the phone by touching the fingerprint sensor anymore . But unlocking works fine though. I have been googling around but noone seems to have this problem.
Do anyone in here have aclue to what might be the problem here ?

Since when could you even lock the phone using the fingerprint sensor?

Nonetheless, this is the XDA community of developers, and im sure a random person just needed this functionality on their phone, so they made and app for it..
Anyways, here's a link to a tutorial. It covers exactly what you want, and apparently the app is developed by a couple of XDA developers, so it should be safe too
How to Turn Off Android Screen with your Fingerprint Scanner
Those days are gone when we relied on passwords and PINs to unlock our Android smartphones. These days we have fingerprint and facial scanners. Most of
techviral.net
EDIT: Just realised that the downlaod link is broken lol, heres a link to the apk:
Download Fingerprint to Sleep (com.ztc1997.fingerprint2sleep) 0.2.0 APK | AAPKS
Download Fingerprint to Sleep 0.2.0:
aapks.com

PhotonIce said:
Since when could you even lock the phone using the fingerprint sensor?
Click to expand...
Click to collapse
From the get-go, when I bought my phone. Thought it was normal. My old Moto G5 did same thing. Really handy when you just need to view whatever is on the screen for a short moment.

Locking the screen means turning it off.. (and locking your device so that you have to scan your finger or use a pattern to unlock it again)
Opalappa_Sailing_Goose said:
From the get-go, when I bought my phone. Thought it was normal. My old Moto G5 did same thing. Really handy when you just need to view whatever is on the screen for a short moment.
Click to expand...
Click to collapse

Otherwise yes, the phone's screen will turn on on the lock screen if you touch the sensor and the fingerprint isnt recognised. That's not the same as locking your phone. Locking your phone is the equivalent of pressing the power button once, which puts your phone into sleep and forces you to unlock it again (via fingerprint/pattern etc)

Can you clarify what you're asking for here?
Do you want the screen t oturn on when you tap the sensor or do you want the screen to turn off when you tap the sensor?
And do you want it to unlock when you tap the sensor, or do you want it to turn the screen on onto the lockscreen so that you can see the time/notifications etc?
(The links I posted are for LOCKING your phone using the sensor (turning the screen off and locking it, causing you to have to unlock it again when you turn it back on), because that's what you asked for..

PhotonIce said:
Nonetheless, this is the XDA community of developers, and im sure a random person just needed this functionality on their phone, so they made and app for it..
Anyways, here's a link to a tutorial. It covers exactly what you want, and apparently the app is developed by a couple of XDA developers, so it should be safe too
How to Turn Off Android Screen with your Fingerprint Scanner
Those days are gone when we relied on passwords and PINs to unlock our Android smartphones. These days we have fingerprint and facial scanners. Most of
techviral.net
EDIT: Just realised that the downlaod link is broken lol, heres a link to the apk:
Download Fingerprint to Sleep (com.ztc1997.fingerprint2sleep) 0.2.0 APK | AAPKS
Download Fingerprint to Sleep 0.2.0:
aapks.com
Click to expand...
Click to collapse
I found the app. But somehow it didnt work on my phone. Only worked while app was open. And it made me unable to unlock with fingerprint
Thx anyway for the fast reply. Looks like I have to live with it for a while. Im pretty happy with my phone otherwise!