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Fingerprint sensor stops working

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By kamueone, Member on 18th December 2018, 06:58 PM
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sometimes the indisplay Fingerprint sensor stops working at all.
The display wont recognize any touch and stays black.
If i push the Power button it starts working again.

This happens sporadically, 1 -3x a day

Did anyone had the same Problem?

Any suggestions?

Thanks for reading....
21st December 2018, 09:13 PM |#2  
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No one?
21st December 2018, 10:22 PM |#3  
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Quote:
Originally Posted by kamueone

No one?

I haven't seen this problem. I use face unlock along with it and it usually recognizes my face before I can even scan it.
21st December 2018, 11:03 PM |#4  
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When the screen is black, you can put your finger on the display and some glowing circle Appears. This does not appear to me at all. The screen just stays Black.

Thx for the information.
22nd December 2018, 08:01 AM |#5  
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Quote:
Originally Posted by kamueone

When the screen is black, you can put your finger on the display and some glowing circle Appears. This does not appear to me at all. The screen just stays Black.

Thx for the information.

Maybe your fingerprints got erased somehow? Does your phone display a fingerpring icon on the screen a second after you turn the screen off?

Sent from my LYA-L29 using XDA Labs
22nd December 2018, 10:53 AM |#6  
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Yes the second I turn if off it shows a fingerprint sensor. Just after a while it won't toggle the sensor if I touch the display. It's like the fingerprint sensor is deactivated. The second I turn the display on manually it appears again.
28th March 2019, 08:22 AM |#7  
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Hello! I've got the p20 pro and now I'm testing mate 20 pro. Sometimes I'm not able to unlock the mate with my fingerprints at all. Same finger. The p20 works perfect, just touch and unlock. Mate sometimes I have to touch it 3-4 times before it unlocks , sometimes it doesn't unlock at all? Is that normal? The display was exchanged already because of this issue.
28th March 2019, 11:09 PM |#8  
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I believe you guys are not the only one. This on screen finger print is not reliable. I guess because they are new and will improve over time. Personally I just use face recognition than finger print. They are a lot more faster and accurate to unlock.
30th July 2019, 11:25 AM |#9  
I know it's an old thread but it's happening to my M20Pro right now! It's awful! The screen is protected by a tempered glass made by Spigen (maybe this glass has issues?). I reconfigured the fingerprint and I touched almost 50 times until the phone captured the fingerprint! What's wrong with that sensor?!
30th July 2019, 11:00 PM |#10  
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I had problems with glass protector, if you can get plastic film it is fine, glass you will have problems....this was my finding
2nd September 2020, 09:31 AM |#11  
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Possible brightness/proximity sensor issue
Quote:
Originally Posted by kamueone

sometimes the indisplay Fingerprint sensor stops working at all.
The display wont recognize any touch and stays black.
If i push the Power button it starts working again.

This happens sporadically, 1 -3x a day

Did anyone had the same Problem?

Any suggestions?

Thanks for reading....

If you still have this phone and problem: I have a P30 Pro, and/but the reason I write here is because our phones share the fingerprint technology, and I didn't find anyone mentioning this problem regarding P30 Pro. So:

I have the same problem - seemingly sporadically the fingerprint sensor (or screen) wont react until I press the power button. Then I noticed that when the brightness/proximity sensor (located near the top right on the P30 Pro, and next (right) to the upper speaker on Mate 20 Pro) was covered, the screen would get unresponsive. I guess this is by design, to not accidently let your phone come to life in your pocket. The problem was/is that the proximity (?) sensor is way too sensitive - any obstruction at about 2 cm (0.8") above the sensor(s) will trigger this behaviour. I also think it can be triggered under other circumstances; I had som weird fingerprint/screen behaviour in a store with a high and very dark ceiling, but I have to test this again, so don't take my word for it.

Anyway - if anyone is having sporadic problems - see if this could be a reason.

Edit: Well, sometimes my screen is just totally unresponsive even without sensors blocked, so ... I noticed it a couple of times after digging my phone out of my pocket, suggesting it could still have something to do with the sensors turning the screen (functions) off. I'll try to see if I can make it behave the same way in other scenarios.
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