Develop Bugs

[Q] [HELP] Fingerprint not working after fall at 30cm high [SM-T805]

Hi guys,
I need help, my new one month old Tab S now no longer have the fingerprint sensor working.
It fell down small table where it flat out on the floor (wooden floor), with the LCD facing upward.
After the fall, it now no longer have the fingerprint function, so i have tu unlock using alternatives password.
I already tried re-boot, not helping at all.
decided to do factory reset since its a few month old, so no apps or data i really care to be deleted.( thought it would be a software glitch, since so many sensor giva data during the fall, i think so)
but still, when i tried to access the fingerprint manager, it shows
" An Error has occured with the fingerprint sensor, If this message appears repeatedly, restart your device"
I need the fingerprint sensor working to prevent the kids playing with my tablet.
Can anyone point me something that will help? or should i flash it to new firmware
Samsung Tab S 10.5 LTE SM-T805
Build No: KOT49H.T805XXU1ANFB
Version : 4.4.2

Raymee_6367 said:
Hi guys,
I need help, my new one month old Tab S now no longer have the fingerprint sensor working.
It fell down small table where it flat out on the floor (wooden floor), with the LCD facing upward.
After the fall, it now no longer have the fingerprint function, so i have tu unlock using alternatives password.
I already tried re-boot, not helping at all.
decided to do factory reset since its a few month old, so no apps or data i really care to be deleted.( thought it would be a software glitch, since so many sensor giva data during the fall, i think so)
but still, when i tried to access the fingerprint manager, it shows
" An Error has occured with the fingerprint sensor, If this message appears repeatedly, restart your device"
I need the fingerprint sensor working to prevent the kids playing with my tablet.
Can anyone point me something that will help? or should i flash it to new firmware
Samsung Tab S 10.5 LTE SM-T805
Build No: KOT49H.T805XXU1ANFB
Version : 4.4.2
Click to expand...
Click to collapse
Is there any damage to the screen? I don't know if flashing another firmware will help. If it's still looking good an everything, you can take it to Samsung and say it won't work. They should fix it under warranty..

DUHAsianSKILLZ said:
Is there any damage to the screen? I don't know if flashing another firmware will help. If it's still looking good an everything, you can take it to Samsung and say it won't work. They should fix it under warranty..
Click to expand...
Click to collapse
There's no damage to the screen, it fall flat on its back.
it was a bit frustrating since it only fall at a height of 30 cm.
i was hoping this can be fix quick, since i started using it to do presentations to clients.
i try ask with Samsung first.

If your device has a built in dialler you can type in *#0*# to access the built in hardware test.
Also have you tried to re-register your fingerprint?

Android 8.1 slow fingerprint reader

Anyone else notice or experience a slower fingerprint unlock after applying the 8.1 OTA update? A VERY noticeable difference in unlocking speed after the update.

1up1up said:
Anyone else notice or experience a slower fingerprint unlock after applying the 8.1 OTA update? A VERY noticeable difference in unlocking speed after the update.
Click to expand...
Click to collapse
No issue here mate, still as fast as it was before on 8.0.0. Might wanna try another reboot to see if it fixes your issue. You could then always try a factory reset as well.

I just downloaded and reinstalled the 8.1 factory image. Went through and setup phone from today's backup and added fingerprints. While the phone was finishing downloading apps from backup, the fingerprint unlock was fast and normal as usual. After apps updated and restore finished, I restarted the phone. Immediately, the slow fingerprint unlock returned. I have very few apps and this wasn't an issue until after I applied the 8.1 OTA side load before the initial posting of this thread. Additional testing of the speed by pressing the power button then unlocking with fingerprint reader yields inconsistent unlock speeds. At this point, I do not want to say that maybe it's because of a particular app that is installed on the phone, but rather it's possibly a problem with 8.1.
Any thoughts?

To put it into perspective, the fingerprint unlock under normal speed feels almost "too sensitive" because it's so fast. Now it registers my fingerprint touch right away but is followed by a slight pause/stutter before unlocking the screen.

1up1up said:
To put it into perspective, the fingerprint unlock under normal speed feels almost "too sensitive" because it's so fast. Now it registers my fingerprint touch right away but is followed by a slight pause/stutter before unlocking the screen.
Click to expand...
Click to collapse
I have this exactly

I too am facing similar problems. My phone on 8.1 takes about 1.5s to unlock while it only took <1s on 8.0. A workaround I took was to have always on display activated. And I ain't a fan of the always on display.

Yup. First thing I noticed was this delay between when the fingerprint is actually recognized (vibrate), until I actually get visual on the screen. Around a second or more

I actually had this issue on 8.1 DP2. But since doing a fresh install of the 8.1 official release, my finger print reader is just as fast as 8.0. Maybe try a new fresh install.

SOLIDFND said:
I too am facing similar problems. My phone on 8.1 takes about 1.5s to unlock while it only took <1s on 8.0. A workaround I took was to have always on display activated. And I ain't a fan of the always on display.
Click to expand...
Click to collapse
I too, am not a fan of the "Always On" display but can confirm that this does fix the problem. Thanks for sharing your finding.

sn0warmy said:
I actually had this issue on 8.1 DP2. But since doing a fresh install of the 8.1 official release, my finger print reader is just as fast as 8.0. Maybe try a new fresh install.
Click to expand...
Click to collapse
Sadly, I actually went through a fresh 8.1 install but fingerprint scanner is still slow with ambient display off. Off to reinstalling my apps...

I found hit super hit or miss. When I flashed my rma phone to dp2 it was slow to unlock. When I flashed 8.1 final it was fast again. I had to flash 8.1 final again but this time the phone was slow to unlock. I got my new device flashed 8.1 on and it is thankfully unlocking quickly. I wish you all luck

I submitted it to Google under DP2 and it has been deferred to a future build... maybe re-submit under the final 8.1 as well??
https://issuetracker.google.com/issues/69984153

Today I also noticed a random "static pop" noise coming from the phone while Chrome browser was open. It was quite distinct and loud and happened twice.

SOLIDFND said:
Sadly, I actually went through a fresh 8.1 install but fingerprint scanner is still slow with ambient display off. Off to reinstalling my apps...
Click to expand...
Click to collapse
Same problem, gets fixed with always on display but if the screen is not on in between the seconds of pressing the power button and ambient display kicks in then the problem is still there. Also tried deleting the fingerprints and redoing the fingerprint initiation, but it did not help. The sensor registers the fingerprint by vibrating but screen gets on only after a second or more. sometimes though it is instantaneous. another problem for Google to fix I guess in next month update.

1up1up said:
To put it into perspective, the fingerprint unlock under normal speed feels almost "too sensitive" because it's so fast. Now it registers my fingerprint touch right away but is followed by a slight pause/stutter before unlocking the screen.
Click to expand...
Click to collapse
Same issue here since updated to 8.1
The fingerprint is recognized quickly (you fell the short vibration) but the screen turns on with a delay of about a second.
I have the same issue when I just press the Powerbutton - it also takes about a second until screen turns on.
Guys, I'm so disappointed with my Pixel 2 XL. Never had so many issues with a stock firmware phone.

Been running 8.1 through the beta for awhile now and haven't had any of these issues. Not sure if I'm just lucky or what but it's been humming along just fine. Just installed the 8.1 official over the 8.1 beta and haven't noticed anything as of yet. Will pay attention to see if I notice anything being slower.

I am also seeing the issue after updating to 8.1. It takes about 2 seconds for the screen to appear. AOD does make it faster but I can deal with it and hopefully google fixes it soon

I searched he'd the issue on google- obviously because I HAVE IT TOO. This is infuriating. This is major functionality. after 8.1 the finger print reader is slow AF. It feel like my old galaxy s4 that i just came away from when i would swipe to unlock it. How many times do we unlock these things a day? We just went from the fastest unlocking phone to the slowest. Why is this effed up? I'm pissed.
We have ppl whining about the freaking hamburger emoji having the cheese on the bottom and the wrong foam in the beer mug, meanwhile it takes forever to get into the phone to do anything much less get to the Emojis. How does BASIC functionality go BACKWARDS with an update?
What's even more infuriating is I can't go back to 8.0!!! Google doesn't allow it do they? I am coming to this phone off a Galaxy s4. One of the big benefits of the pixel family is the "fast updates."I saw someone argue that this isn't necessarily a plus sometimes these new Android versions slow a phone down, and it's done. Sometimes, like in this case, bugs are introduced. The very first update I took on this phone largely argues his point.
Another thing I'm noticing is the battery life seems to be dropping much faster. I'm wondering if it's the flash kernel 2.0 I installed though.
I will be filing a complaint on the link someone so kindly posted above (thank you), and I will be going into the chat option through the help menu on my phone to file a complaint there.
EDIT: it also seems like Google assistant isn't working now either. "Ok Google" brings her up. The mic registers my talking, but no results are displayed.
EDIT 2: I also forgot to mention that along with the slow unlock the swipe function on the finger print reader has been altered. Smiling up and down to toggle the notification drawer is very inconsistent and buggy. I have the finger print quick action app installed. I had a single tap set up to lock the screen. I had my finger print reader un/locking the phone and toggling the notification drawer. While the notification drawer has always been a little buggy, it was VERY functional and very acceptable. Something has changed on the reader so it is having a harder time differentiating between the different movements. Now it usually registers a swipe as a tap and the screen locks. I expected this to happen when I first downloaded the app on 8.0, but I was pleasantly surprised when everything worked through the sensor. Now I am very disappointed. The issue is NOT constant. It comes and goes. Idk why it does that. I'll be seeing if I can figure out why. I will NOT be activating the always on screen as a means to circumvent this issue. I don't want burn in. I've been concerned with that issue associated with always on before the pixel showed up.

jbarcus81 said:
I submitted it to Google under DP2 and it has been deferred to a future build... maybe re-submit under the final 8.1 as well??
https://issuetracker.google.com/issues/69984153
Click to expand...
Click to collapse
I want to jump on board and file an issue too. What do I select the issue as?it's not a developer preview. Is it android system issue? Framework?

fearfighters said:
I have this exactly
Click to expand...
Click to collapse
-deleted
---------- Post added at 06:08 PM ---------- Previous post was at 06:02 PM ----------
1up1up said:
To put it into perspective, the fingerprint unlock under normal speed feels almost "too sensitive" because it's so fast. Now it registers my fingerprint touch right away but is followed by a slight pause/stutter before unlocking the screen.
Click to expand...
Click to collapse
Same here

Fingerprint scanner issue after upgrade to 9.0

So I finally took the jump to Pie. One of the smaller issues I have that I didn't before is when trying to set up my fingerprints again, I get an error on the last press which tells me to try again or try another finger.

Yes, an issue for me also. Sometimes it just does not work and other times it tells me the fingerprint sensor is dirty which it is not. Fingerprint sensor issues have been reported by others too after installing Pie. It does not seem to me to be as common as the notification issues with Pie, (which I also have), but it is talked about. I also did a factory reset a couple days after installing 9.0 which did help a couple of apps to work better but did not help the fingerprint or notification problems.
The fingerprint issue is weird as sometimes it is so bad, I think I will not be able to keep the phone, just will not work at all. Then for no discernible reason it will start working fine. It is not just a pain to have to use another login method every time the phone needs to be woken up, but I also use fingerprint sign in for a few apps and it is much harder to have to enter one of my random 14 character passwords when the fingerprint won't work.

Try to put your Ambient display Always on... see if it fixes the fingerprint problem (Google is aware of this issue) till google issues a permanent fix.

Wasn't that only a workaround for people who had fingerprint lag? I don't think it was for fingerprint reading issues.
I did notice a lot more fingerprint reading errors with Pie then redid my fingers and all has been fine.
itzik_man said:
Try to put your Ambient display Always on... see if it fixes the fingerprint problem (Google is aware of this issue) till google issues a permanent fix.
Click to expand...
Click to collapse
Sent from my Pixel 2 XL using Tapatalk

Fingerprint scanner stopped working, can't be found

Suddenly the fingerprint scanner became less responsive the past few days. Then today it's just stopped working. Restarted, cleared fingerprints, restarted and system could not find scanner and bring it to support. Another restart and I was able to add fingerprints, but it still does not unlock the phone.
Any thoughts?

I'm done with LG too. V10 dead. G7 thinq dying. DONE!

Hey guys, I'm actually a Pro! I repair phones all day everyday and the G7 is my daily, my fingerprint scanner actually quit working and I replaced it, and it works totally fine now. I believe it is a manufacturing defect, but LG is a **** company and they don't own up to stuff like this. I love my G7, but I wish they handled things better. If you can send it in on warranty, otherwise replace the fingerprint scanner. Any local shop should be able to to do it 60-80, Mobile Defenders has OEM ones. Different colors work Fina as well. I have a pink ok on my blue boy. It's dope. Only real issue I've had, that and my battery is starting to get mediocre

I'm in the same boat. A reboot does the trick, but it's sooo annoying. Wish LG would own up and fix it.

Only it's not an issue because of the millions of g7s that have no problems.....
Issemann said:
I'm in the same boat. A reboot does the trick, but it's sooo annoying. Wish LG would own up and fix it.
Click to expand...
Click to collapse
No issue with fingerprint scanner....

Excuse my bad english....
It happens to me sometimes but is due to some apps installed out of google play. In my case the solution is just to uninstall the app or the apps and then reboot the phone. It works for me in 100% of cases.
Some other cases i can just install them again and the fingerprint scanner is working with that app.

pmoral said:
Excuse my bad english....
It happens to me sometimes but is due to some apps installed out of google play. In my case the solution is just to uninstall the app or the apps and then reboot the phone. It works for me in 100% of cases.
Some other cases i can just install them again and the fingerprint scanner is working with that app.
Click to expand...
Click to collapse
Which apps gave you problems?

Issemann said:
Which apps gave you problems?
Click to expand...
Click to collapse
Always the cracked ones. Not all the cracked apps but NOT the apps from google play.
I meand that is like if the apps i donwload from that web sometimes block the fingerprint.
And most of the times is just inmediately.
I dont usually install those cracked apps but i download a few photo and video editing tools.

Mine "fixed" itself after about a week. It may have been an app or an update. But it works fine again.

Solution to fingerprint not responding | Dead | Suspected Hardware Issue
OnceAMatrixMan said:
Suddenly the fingerprint scanner became less responsive the past few days. Then today it's just stopped working. Restarted, cleared fingerprints, restarted and system could not find scanner and bring it to support. Another restart and I was able to add fingerprints, but it still does not unlock the phone.
Any thoughts?
Click to expand...
Click to collapse
So, after lot of investigation, the problem is with the fingerprint's "activity". It just stops working which will cause it to not show up in the menu and more headaches around other apps relying on it.
The possible solution to this is:
Download activity launcher or any app that can extract the activities running in your phone.
find: 'FingerprintASM' and 'FingerprintAuthenticator' under 'all activities' from the drop-down menu on the top
Tap on each to run it.
Restart the device.
Thank me later once done. :good:

Tried it a few times, but fingerprint only works about 75% of the time event after trying this. In fact it's getting worse. Maybe it's hardware...

OnceAMatrixMan said:
Suddenly the fingerprint scanner became less responsive the past few days. Then today it's just stopped working. Restarted, cleared fingerprints, restarted and system could not find scanner and bring it to support. Another restart and I was able to add fingerprints, but it still does not unlock the phone.
Any thoughts?
Click to expand...
Click to collapse
I have very similar problem. Fingerprint works in random situation but many times it does not work. Looks like fingerprint ceases to be active.. maybe its firmware problem. LG probably do not care about it.. but I see many LG users haves this problem.

I had an issue with mine when I first got it. The back plate had been removed and glued back on. It was slightly open on the top, which made the fingerprint sensor move away from the connection on the back of the phone. The sensor was mostly unresponsive until I sealed it back up. Not sure if this pertains to your problems, but I figured I'd share.

For the Repair Pro!
das_webos_transformer said:
Hey guys, I'm actually a Pro! I repair phones all day everyday and the G7 is my daily, my fingerprint scanner actually quit working and I replaced it, and it works totally fine now. I believe it is a manufacturing defect, but LG is a **** company and they don't own up to stuff like this. I love my G7, but I wish they handled things better. If you can send it in on warranty, otherwise replace the fingerprint scanner. Any local shop should be able to to do it 60-80, Mobile Defenders has OEM ones. Different colors work Fina as well. I have a pink ok on my blue boy. It's dope. Only real issue I've had, that and my battery is starting to get mediocre
Click to expand...
Click to collapse
Question for the repair guy! My G7 Thinq fingerprint scanner stopped working. I tried to add my fingerprints again with no luck. The phone "buzzes" when I touch the sensor and the screen displays "Place your finger on the center of the fingerprint sensor." Sometimes I get "Sensor needs to be cleaned"
Stepped through some other suggestions and did a "hard reset/wipe of the phone", no joy. Will replacing the fingerprint sensor would effect a repair? I would hate to go to the repair shop, pay for the replacement, and it still not work.
Thanks in advance

One possible quick fix
I noticed in a tear-down video that the fingerprint sensor uses touch contacts for signal transmission (as opposed to being a plug-in contact). I pressed on the area about where it is located, just under the flash and IR, and now it works! If you've dropped your phone a few times it might cause this as the back is glued on and the contact area could pull away from the glue (just a theory). I think I will try to heat it up and press down on it some more for good measure.
Update:
This approach does get it working again but the effect is not long-lived. Tried it with heating but again it is not permanent. Alas.

Surf Excel said:
So, after lot of investigation, the problem is with the fingerprint's "activity". It just stops working which will cause it to not show up in the menu and more headaches around other apps relying on it.
The possible solution to this is:
Download activity launcher or any app that can extract the activities running in your phone.
find: 'FingerprintASM' and 'FingerprintAuthenticator' under 'all activities' from the drop-down menu on the top
Tap on each to run it.
Restart the device.
Thank me later once done. :good:
Click to expand...
Click to collapse
I don't have these activities in the Android 10 ROM. When I activate some others it throws an error that seems to indicate the hardware is missing.
It's newly ordered and it seems connected ok, same position as original, checked without cover too, just doesn't work. Perhaps incompatible hardware or faulty?

activity launcher did not work on my LG Q stylus plus !!!

Surf Excel said:
So, after lot of investigation, the problem is with the fingerprint's "activity". It just stops working which will cause it to not show up in the menu and more headaches around other apps relying on it.
The possible solution to this is:
Download activity launcher or any app that can extract the activities running in your phone.
find: 'FingerprintASM' and 'FingerprintAuthenticator' under 'all activities' from the drop-down menu on the top
Tap on each to run it.
Restart the device.
Thank me later once done. :good:
Click to expand...
Click to collapse
activity launcher did not work on my LG Q stylus plus !!!

OpenMinded said:
I don't have these activities in the Android 10 ROM. When I activate some others it throws an error that seems to indicate the hardware is missing.
It's newly ordered and it seems connected ok, same position as original, checked without cover too, just doesn't work. Perhaps incompatible hardware or faulty?
Click to expand...
Click to collapse
It seems to appy to Android 9. 10 has some other processes.
Easiest is to look for Smart cleaning, then choose fingerprint.
It will show that the hardware is not being detected.
I tried everything to no avail.
I either got two broken sensors or another issue.
Seems the lower board might be suspect.
If anyone figures it out, please psot, so will I.
Thanks

Surf Excel said:
Solution to fingerprint not responding | Dead | Suspected Hardware Issue
So, after lot of investigation, the problem is with the fingerprint's "activity". It just stops working which will cause it to not show up in the menu and more headaches around other apps relying on it.
The possible solution to this is:
Download activity launcher or any app that can extract the activities running in your phone.
find: 'FingerprintASM' and 'FingerprintAuthenticator' under 'all activities' from the drop-down menu on the top
Tap on each to run it.
Restart the device.
Thank me later once done. :good:
Click to expand...
Click to collapse
My friend 100 thanks after 1 month and hours to search finally i make it

fingerprint sensor - not working properly anymore

Hi guys,
Lately I've noticed that my fingerprint sensor does not work properly anymore.
Not sure if it's a hardware or software issue?
Though, the test HW for Fingerprint Sensor from Smart Doctor app reports Good status during all tests.
The behavior is strange and not consistent, most of the times it will work fine but from time to time I cannot unlock/wake the phone with the fingerprint sensor, it's not like the fingerprint is not recognized, it's more like putting the finger on the sensor and nothing happens (it doesn't vibrate like is reading it or not) . Not sure if is related to the phone being in standby for longer period, or I don't know ...
I'm more inclined to believe it's a software issue, and seems to have occurred lately after last update to Android 10 (v30f-EUR-xx, phone type LM-G710EM).
I've tried may method, deleting the finger prints and add them again , even did a factory reset but the issue seems to come back.
Do you guys have such issue?
Any idea how to diagnose this further?

dinoc said:
Hi guys,
Lately I've noticed that my fingerprint sensor does not work properly anymore.
Not sure if it's a hardware or software issue?
Though, the test HW for Fingerprint Sensor from Smart Doctor app reports Good status during all tests.
The behavior is strange and not consistent, most of the times it will work fine but from time to time I cannot unlock/wake the phone with the fingerprint sensor, it's not like the fingerprint is not recognized, it's more like putting the finger on the sensor and nothing happens (it doesn't vibrate like is reading it or not) . Not sure if is related to the phone being in standby for longer period, or I don't know ...
I'm more inclined to believe it's a software issue, and seems to have occurred lately after last update to Android 10 (v30f-EUR-xx, phone type LM-G710EM).
I've tried may method, deleting the finger prints and add them again , even did a factory reset but the issue seems to come back.
Do you guys have such issue?
Any idea how to diagnose this further?
Click to expand...
Click to collapse
Make sure your battery isn't swollen. A swollen battery will take out the fingerprint sensor first because it's right on top of the connection.

Hmm, interesting, from the outside I can't feel any difference, the back seem flat.

Exactly the same problem here. But if I check the sensor while it is not working I get a "sensor not respondong error".
Did you solve somehow?
Thank you