Mi 9T Pro fingerprint doesn't work after replacing amoled display with original spare - Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe

I replaced the Mi 9T Pro amoled display with a new original one, but the fingerprint doesn't work. The fingerprint sensor is still working, the problem is related to the calibration. I tried using the "Activity launcher" app to calibrate the sensor, I chose "In display fingerprint" then "SPMT", but this process failed when it asked to "Calibrate, put the FLESH CHART then click next" with error "0x14 the number of bad pixel is abnormal".
I know that "FLESH FLAT" means that I need to use a mirror on the fingerprint, but what does "FLESH CHART" mean?
Thank you

Here some screenshots and the difference between the two displays: https://drive.google.com/folderview?id=1lJ0_T0kMW3kOl-2Piy8vC9VUv2cUhLeG

Hello , There are issues with the miui 12 update. Is your screen really 100% original?

sacha2506 said:
Hello , There are issues with the miui 12 update. Is your screen really 100% original?
Click to expand...
Click to collapse
I think that it's the original one, here a link https://drive.google.com/folderview?id=1lJ0_T0kMW3kOl-2Piy8vC9VUv2cUhLeG to a photo gallery with the photo comparison between the two displays.
There is an official procedure to perform the fingerprint calibration?
Thank you

according to your photos it is not the original screen but an adaptable one. the reference is not the same look carefully ...
sorry I don't know the procedure ...

sacha2506 said:
according to your photos it is not the original screen but an adaptable one. the reference is not the same look carefully ...
sorry I don't know the procedure ...
Click to expand...
Click to collapse
Thank you for your reply. I bought this spare parts on eBay. It was described as original AMOLED
About the reference, do you mean the code that is in the bottom of the screen on the gray tape?
At this point I will try to change it again... There is a shop where I can buy original spare parts? I know that this one is a good shop https://dragon-tt.com/Products.aspx?gid=95 but you need to wait some days for the shipment because they ship from China.
Thank you

I think that of your link is good however I do not know the difference between the beginning of the serial number JA and JC or JB ... Anyone know the difference or is it just a year or a place of production?

sacha2506 said:
I think that of your link is good however I do not know the difference between the beginning of the serial number JA and JC or JB ... Anyone know the difference or is it just a year or a place of production?
Click to expand...
Click to collapse
I think that I will buy a new one on dragon-tt.
Do you think that ask to the reseller for the beginning of the serial number it's important?
Thank you

Yes Il think ...

sacha2506 said:
Yes Il think ...
Click to expand...
Click to collapse
Dragon-tt give me this reply:
This item is 100% original new.
It recognize the fingerprint .
You can not start calibration process ,because you have no tool.
Only xiaomi have the tool to calibrate the finger print.
Our screen comes with JA.
I think it is not a problem.
Click to expand...
Click to collapse

it still seems weird to me. but if so then Xiaomi should be able to fix the problem with an update.

Have you tried to factory reseting the device?
Please let me know

Grazma said:
Dragon-tt give me this reply:
Click to expand...
Click to collapse
I see that there are some topics with reports of the same problem, that is: difficulties with the fingerprint scanner after replacing the broken screen of an MI 9T / K20D [PRO].
A summary of the situation:
Until MIUI 11, the MI 9T / K20D [PRO] worked normally even when their screen was replaced by non-original screens with only 5 multitouch points, sometimes described as "tft" or "oled", including the fingerprint scanner.
Most of the screens available on internet sellers are of these types, and vendors often insist that they are original. The easiest way is to check the number of multitouch points, if it is not 10, it is not original.
After upgrading to MIUI 12, the fingerprint scanner of the MI 9T / K20D [PRO] equipped with these screens no longer works, restarting the device whenever trying to register a fingerprint. This is not a calibration problem.
The only solution found so far is to replace the non-original screen with an "AMOLED" screen, with 10 multitouch points, which is either original or at least has characteristics similar enough to the original to work.
This topic has a good explanation on that subject https://forum.xda-developers.com/k20-pro/help/miui-12-fingerprint-unlock-defective-t4122135
I hope it helps

As Thoriq said, have you tried factory resetting it? i had the same problem when i replaced the screen on my cepheus with a bad quality one and that fixed it

[Solved]
rodrimax10 said:
As Thoriq said, have you tried factory resetting it? i had the same problem when i replaced the screen on my cepheus with a bad quality one and that fixed it
Click to expand...
Click to collapse
Hi guys, after reading the last update in this thread, I tryed to install a clean Global ROM on my Mi 9T Pro, and it works, but due to the cheap quality of the new AMOLED, the recognition works 1 time on 8.
I followed this guide step by step, and if you open this link from a smartphone, turn on the "Desktop Mode" otherwise you will see a blank page: https://c.mi.com/oc/miuidownload/detail?guide=2 - to follow the guide you need a Windows PC -.
If you need to unlock the device, first you will need to turn on the "Developer options", go into the "Mi Unlock status" menu, and bind the Xiaomi Account with the unlocker. Of course, you will need the Xiaomi Account password.
Ater the unlock, according to the guide that I linked before, the device will reboot, but sometimes it stops on the coloured "MIUI" logo. So after 5 minutes without any change, I turned off the device pressing the power button, and then it rebooted correctly. After the first reboot, it asked me to add again the Xiaomi Account password, because the device was already paired with an account. At this point it booted, and I turned off the device before selecting the system language, and I continued to follow the linked guide from the STEP 3.
The nice thing is that the fingerprint works again, unfortunately the bad quality of the display cannot be fixed without replacing it again.
Thank you for your help guys.

Grazma said:
[Solved]
Hi guys, after reading the last update in this thread, I tryed to install a clean Global ROM on my Mi 9T Pro, and it works, but due to the cheap quality of the new AMOLED, the recognition works 1 time on 8.
I followed this guide step by step, and if you open this link from a smartphone, turn on the "Desktop Mode" otherwise you will see a blank page: https://c.mi.com/oc/miuidownload/detail?guide=2 - to follow the guide you need a Windows PC -.
If you need to unlock the device, first you will need to turn on the "Developer options", go into the "Mi Unlock status" menu, and bind the Xiaomi Account with the unlocker. Of course, you will need the Xiaomi Account password.
Ater the unlock, according to the guide that I linked before, the device will reboot, but sometimes it stops on the coloured "MIUI" logo. So after 5 minutes without any change, I turned off the device pressing the power button, and then it rebooted correctly. After the first reboot, it asked me to add again the Xiaomi Account password, because the device was already paired with an account. At this point it booted, and I turned off the device before selecting the system language, and I continued to follow the linked guide from the STEP 3.
The nice thing is that the fingerprint works again, unfortunately the bad quality of the display cannot be fixed without replacing it again.
Thank you for your help guys.
Click to expand...
Click to collapse
DEAR SIR I HAVE THE SAME PROBLEM AND FOLLOWED your procedure but no result.

I bought an AMOLED screen manufactured by Samsung, complete with frame, supports 10 touch points, with color quality and contrast very similar to the original screen of my Mi 9T. At first it is a good display, the seller has guaranteed that it is of Original / OEM quality. Here is the link to the part I bought: https://www.aliexpress.com/item/4000156095854.html
The only problem is that biometric recognition does not work on MIUI 12! The sensor registers my fingerprint but the phone does not unlock with it. I've tried to downgrade to MIUI 11 and it didn't work either. Any solution?

same situation but the one I got is branded OLED instead of an AMOLED one. I wish there's a way to calibrate the fingerprint as I registered the same finger thrice for accuracy but it still doesn't detect properly.

ClockUpEx said:
same situation but the one I got is branded OLED instead of an AMOLED one. I wish there's a way to calibrate the fingerprint as I registered the same finger thrice for accuracy but it still doesn't detect properly.
Click to expand...
Click to collapse
You can try to follow what I have done here. But, if you didn't bought the original spare part, you will probably be unable to use the fingerprint scanner due to the bad quality of the display.

It worked either you replaced original (10 or 5 finger touch support) Theres a tricky way to make it done.
Xda user from iran n india successfull fod

Related

RM3 fingerprint... Not really convincing here :( But : Face unlocking : super :)

Hi,
Using the Red Magic 3 is quite nice, but one of the major problems to me is the FingerPrint scanner.
It happens really often that I have to "press" the FP scanner several times before it lets me in
But on the other had, Face unlcok works superbly here !
It recognizes my face everytime, even in rather dark environment.
And unlocking is then super fast...
Guess I'll use that more often than the FP scanner
You guys also have that "problem" with the P scanner ?
No its working perfect for me, much better then the fp sensor of the xiaomi mi mix 2 (my prev phone). Meaby try to set it up again?
I had the same problem, then it went away, then it came back.
Saw some people complaining here as well on github.
Funny thing for me, seem to be related to having activated multiple users in this device and for some reason the finger print only works (normally) on this second account. Deleting that saving account did not solve the issue as the sensor continues completely irresponsive in my main account (so it's clearly just a software issue). If I recreate a second account it will work there, but still not in my main account.
Do you have more than one user registered for that device? I use the other users mainly to have alt accounts for different games
I'm in touch with their (slow) support and the last message I got was:
We will feedback this case to our R&D .Pls provide the order number and Build number of the phone.If you can, please also provide a video file of this process,thanks.
In my case it's clearly just a software issue, so it should be fixed in future builds (hopefully).
Perhaps a factory reset would help, but I don't want to test that option as I'm lazy to set up everything up again.
Hi,
Same thing here.
The FP scanner is not on par with some of the RM3 sibblings like the Mate 20x or the mi mix 3.
I think the scanner is too small to recognize your fingerprint decently.
But if I compare Face unlock on this device to face unlock on the afroementioned devices, it's a totally different story !!!
It is amazingly fast and reliable, even in low light conditions...
So I am almost always using that one.
Regards.
No problems here with the FP scanner.
I'm on Global ROM,bootloader is still locked,no root and only my account registered to the phone,but I've setup 4 fingerprints,and all of them work quite good....

General Xiaomi Mi 11 issues and defects

Hello guys,
am new to Xiaomi Mi 11 and I want to share with you my opinions (not the positive ones, this is not the aim of this thread). I have Miui Global 12.0.3 rom on it.
Issues:
1. Netflix is not working fine, HDR is not working and video quality is really low. Problem is not related to my network
2. Notification center show notifications with cut content inside. No way to expand them
3. Problems downloading files through Chrome, sometimes download does not start
4. When I wear bluetooth headset, during a call the screen does not switch off
Negative:
1. Camera quality is not that great. My P20 PRO is shooting better in almost all the conditions (am talking about main camera).
2. Battery is worst than my P20 PRO
3. Fingerprint sensor is worst than my P20 PRO
4. Audio quality is worst than my P20 PRO
What do you think? You got the same issues and complaints?
Flash xiaomi.eu!
"4. Audio quality is worst than my P20 PRO"
Mate you got a broken phone , mines sounds better than my bluetooth speaker!
ralovesoc said:
Flash xiaomi.eu!
Click to expand...
Click to collapse
Can you give me some informations? Should I unlock my phone?
ralovesoc said:
"4. Audio quality is worst than my P20 PRO"
Mate you got a broken phone , mines sounds better than my bluetooth speaker!
Click to expand...
Click to collapse
Have you tried P20 pro audio with Dolby enabled? i have both of them side my side and this is not better than my P20 Pro
I am on same rom and facing some issues as well.
1.I don't use Netflix.
2. Notifications are fine
3. Battery life is good., All day with normal use.
4. Only main camera is good, I am satisfied but not amazed,I did expected better one. I have Redmi K20. Other cameras are just garbage like on some super cheap garbage phone. But I think they will be fixed with software future updates. It happened like that on my Redmi K20.
5. I turned off fingerprint sensor because I didn't like haptic feedback while unlocking with fingerprint. It was working same as on Redmi K20. Not so fast but working good. Unlock every time except when your hand are whet.
6. Audio quality is great while talking over any app. And using stereo speakers also.
I did had stereo bug few times , upper speaker stoped working few times and started by itself... It works now.
Haptics are great , I am really enjoying it.
Will write more when I remember more
Asnamus said:
I am on same rom and facing some issues as well.
1.I don't use Netflix. --> waiting for someone confirming me the issue
2. Notifications are fine --> are you using MIUI or Android Style? I have the problem with Android Style
3. Battery life is good., All day with normal use. --> Yes me too. With P20 Pro with the same usage I can reach 2 days.
4. Only main camera is good, I am satisfied but not amazed,I did expected better one. I have Redmi K20. Other cameras are just garbage like on some super cheap garbage phone. But I think they will be fixed with software future updates. It happened like that on my Redmi K20. --> Try the Macro Camera, is amazing!!! Waiting for firmware updates for main and pano camera..
5. I turned off fingerprint sensor because I didn't like haptic feedback while unlocking with fingerprint. It was working same as on Redmi K20. Not so fast but working good. Unlock every time except when your hand are whet. --> I disabled haptic feedback
6. Audio quality is great while talking over any app. And using stereo speakers also. --> I like the quality too, but not that amazing if compared to P20 Pro..
I did had stereo bug few times , upper speaker stoped working few times and started by itself... It works now.
Haptics are great , I am really enjoying it.
Will write more when I remember more
Click to expand...
Click to collapse
Xiaom.eu for Xiaomi devices best choice.
xdamami said:
Xiaom.eu for Xiaomi devices best choice.
Click to expand...
Click to collapse
yes but the phone is new and I don't want to lose my warranty
davidep85 said:
yes but the phone is new and I don't want to lose my warranty
Click to expand...
Click to collapse
You have Global one?
xdamami said:
You have Global one?
Click to expand...
Click to collapse
Yes as I wrote in the first post!
I have another issue, I can't download files from Google Chrome. what about you?
My suggestion for you would be to factory reset your device and test that problems are solved.
Second option would be to download same global rom and reinstall it cuz maybe somehow your rom is corrupted. (For this you need yo unlock bootloader and wait 168h = 7days to unlock and than flash global rom 12.0.3.0) And if still you have same problems (I would suspect that something is wrong with the device) but than download EU rom and install that one.
If that don't work than you should return your device.
My question is , did anybody install EU rom from Global ? If I am correct installation works from Chinese rom to EU because EU is based on Chinese. I am not sure you can install EU from Global without errors.
Read this article about unlocking bootloader and ruining your warranty:
Bootloader Unlocking does not Void Warranty of Xiaomi and Redmi Devices - Gizmochina
Xiaomi smartphones are popular in the developer community, thanks to the company’s policy regarding warranty against unlocking of bootloader. But the brand has now updated its policy. Thankfully, bootloader unlocks still does not void warranty of Xiaomi and Redmi devices but with some caveats...
www.gizmochina.com
davidep85 said:
I have another issue, I can't download files from Google Chrome. what about you?
Click to expand...
Click to collapse
I don't use Chrome, I removed it with adb and instead I am using Kiwi browser which have adblocker built in and dark theme also. And is light and work excellent. Also using duck duck go for search for kiwi browser.
Asnamus said:
My suggestion for you would be to factory reset your device and test that problems are solved.
Second option would be to download same global rom and reinstall it cuz maybe somehow your rom is corrupted. (For this you need yo unlock bootloader and wait 168h = 7days to unlock and than flash global rom 12.0.3.0) And if still you have same problems (I would suspect that something is wrong with the device) but than download EU rom and install that one.
If that don't work than you should return your device.
My question is , did anybody install EU rom from Global ? If I am correct installation works from Chinese rom to EU because EU is based on Chinese. I am not sure you can install EU from Global without errors.
Read this article about unlocking bootloader and ruining your warranty:
Bootloader Unlocking does not Void Warranty of Xiaomi and Redmi Devices - Gizmochina
Xiaomi smartphones are popular in the developer community, thanks to the company’s policy regarding warranty against unlocking of bootloader. But the brand has now updated its policy. Thankfully, bootloader unlocks still does not void warranty of Xiaomi and Redmi devices but with some caveats...
www.gizmochina.com
Click to expand...
Click to collapse
I already reset the phone after the last update. my phone has no hardware or corruption problems, these are just bugs.
davidep85 said:
I already reset the phone after the last update. my phone has no hardware or corruption problems, these are just bugs.
Click to expand...
Click to collapse
Install new rom and good luck
4. When I wear bluetooth headset, during a call the screen does not switch off
The biggest issue I have found on MIUI 12.0.3 global is SOT. I get around 3h30min when on 120Hz and FHD+. A big amount of the battery is drained by Chrome. Anyone got this issue?
alvaronb92 said:
The biggest issue I have found on MIUI 12.0.3 global is SOT. I get around 3h30min when on 120Hz and FHD+. A big amount of the battery is drained by Chrome. Anyone got this issue?
Click to expand...
Click to collapse
9% is not that much man, you are using screen and performances with chrome. anyway is an heavy browser
davidep85 said:
yes but the phone is new and I don't want to lose my warranty
Click to expand...
Click to collapse
You don't lose your warranty by unlock the Bootloader.

AMOLED replacement - AOD - not working

Good day.
I recently replaced AMOLED screen. Fingerprint works, auto brightness, too. But when it comes to always on display, there's a problem. It doesn't work. When I unlock it with button it sometimes shows for 0.5 seconds before going to the homescreen.
Does any one have any ideas how to fix this?
Thank you.
EDIT: Flashed xiaomi.eu MIUI 11 version (before it was xiaomi.eu MIUI 12), and now AOD is working, but either full brightness or minimal (barely visible) brightness, doesn't step up as it should in relation to the ambient brightness. The auto brightness when unlocked works as it should.
Hi, i have the same situation...did you found a solution?
Thank you
Hi I have exactly the same problem. did u solve it? i´ve tried flashing miui 10, 11, 12 Via twrp or xiaomi Miflash, Global or Xiaomi.eu... none of that worked. My AOD is too dimm. Also my fingerprint works very bad and have brightnes issues when touching if i set it to show on AOD... i saw there is a calibration tool for the fingerprint recognition but how to solve the AOD problem? Please help. My replacement is also an Amoled screen.
Where did you buy the screen? I'm trying to find an original replacement online store (who ships to Spain if possible).
uriii13 said:
Where did you buy the screen? I'm trying to find an original replacement online store (who ships to Spain if possible)
Click to expand...
Click to collapse
The first screen was from Aliexpress it claims to be original but clearly not. After both problems with fingerprint and AOD i've changed it for a new one buyed from a repair store localy at Granada, Spain.
All i can say its that the box says esmovil.es website that its for profesional repairs stores only i think...
This new one comes with the phone frame and its claimed to be a xiaomi service pack. All works fine now. Under direct sunlight you can see the diferencies in the fingerprint and light sensor holes with the fake one. You also need to calibrate the figerprint sensor from the CIT menu.
I suggest to buy an OEM replacement to finish all kind of problems related to AOD and fingerprint

Asus Rog 3 no camera and fingerprint scanning

Hello
I bought Asus Rog 3 (android 12) after replacing the screen. He has this problem:
- Only the front camera works, when I try to switch to the rear camera, the camera freezes for a moment and switches back to the front camera.
However, if I turn on the google camera in the options, the rear camera works normally.
- Doesn't read fingerprints. Scanner turns on but does not scan any lines.
I thought android 12 broke and I uploaded android 11 from Asus and it's the same. After a while, it updated itself again to android 12.
I have no idea how the fault could be.
Anyone have any advice on this problem?
Are you sure the device re-assembled properly? I've replaced the display in my ROG 3 before, all worked out very smoothly. Nothing special involved beyond making sure motherboard, fingerprint reader, cameras and everything else are all connected back together correctly...
Andrologic said:
Are you sure the device re-assembled properly? I've replaced the display in my ROG 3 before, all worked out very smoothly. Nothing special involved beyond making sure motherboard, fingerprint reader, cameras and everything else are all connected back together correctly...
Click to expand...
Click to collapse
Thanks for the answer.
I was also wondering about it, to be honest, but since the rear camera works in the "google camera" mode and the white line scanner also, but it does not scan the line, the problem is probably in the software.
In fastbootd mode it displays something like this, I do not know if it is correct because it is my first Rog 3
I don't want to open it while it's possible. Therefore, I am asking if any of my honorable colleagues had this or a similar problem.
IrCio36 said:
Thanks for the answer.
I was also wondering about it, to be honest, but since the rear camera works in the "google camera" mode and the white line scanner also, but it does not scan the line, the problem is probably in the software.
In fastbootd mode it displays something like this, I do not know if it is correct because it is my first Rog 3
I don't want to open it while it's possible. Therefore, I am asking if any of my honorable colleagues had this or a similar problem.
Click to expand...
Click to collapse
The screenshot doesn't tell much. However, you won't be able to RAW flash this device from there. Check that your have correct Fastboot access from the bootloader (without navigating to above). Then do a RAW flash to one of the A10 or A11 versions that works.
Andrologic said:
The screenshot doesn't tell much. However, you won't be able to RAW flash this device from there. Check that your have correct Fastboot access from the bootloader (without navigating to above). Then do a RAW flash to one of the A10 or A11 versions that works.
Click to expand...
Click to collapse
Why should I flash in RAW format? What will this change?
Menu, które wkleiłem, to podmenu fastboot.
I downgraded the software from the Asus website to:
- Android 10 (front / rear camera is working properly, fingerprint scanner is not working)
- Android 11 (rear camera not working, fingerprint scanner not working)
- Android 12 (rear camera not working, fingerprint scanner not working)
I don't know where the problem is. I have already written to Asus about this. We'll see what they write back.
I checked the phone's serial numbers on the Asus website and everything is correct.
The phone was not unlocked and rooted. FOTA is working properly.
Just got the latest version dated 01.08.2022
The problem remained.
Hello
As I wrote above.
Asus spoke very quickly. The phone was sent to service in RMA mode. I don't know what they did, but very fast and everything works as it is supposed to.
I contacted the previous owner and it turned out that the screen was replaced on the Asus service. Guarantee until the end of October
And I was so tempted to open it
It's good that I did not do it because it is a little 16/512GB baby girl
Topic to be closed.
Regards
IrCio36 said:
Hello
As I wrote above.
Asus spoke very quickly. The phone was sent to service in RMA mode. I don't know what they did, but very fast and everything works as it is supposed to.
I contacted the previous owner and it turned out that the screen was replaced on the Asus service. Guarantee until the end of October
And I was so tempted to open it
It's good that I did not do it because it is a little 16/512GB baby girl
Topic to be closed.
Regards
Click to expand...
Click to collapse
I am having similar issue my fingerprint was not working after screen replacement but now after few months my front came stopped working it was working three days back on android 10 and 11 i updated firmware from 10 to 11 to 12 and than degraded from 12 to 11 to 10 but issue still exists my front came and whatsapp video call not working back came is working but when i try to switch to front it freezes and screen turns black until cache clears

Impossible to unlock my Oppo Find X5 Pro with fingerprint with android 13

Hi,
Since i've updated my Oppo Find X5 Pro on Android 13, i have this issue:
I can unlock my phone with fingerprint only one day or two. After that, the fingerprint icon disappear from the unlick screen and I have to reboot my phone to make it work again.
It's a strange issue because i still can open apps with fingerprint...
Do you have any idea to help me?
misteurz said:
Hi,
Since i've updated my Oppo Find X5 Pro on Android 13, i have this issue:
I can unlock my phone with fingerprint only one day or two. After that, the fingerprint icon disappear from the unlick screen and I have to reboot my phone to make it work again.
It's a strange issue because i still can open apps with fingerprint...
Do you have any idea to help me?
Click to expand...
Click to collapse
yeah i got this 1 time, i remember after i change some Lock screen setting (change clock type) then that happened,
the fp icon come bigger and wrong position of lightling sensor.
after reboot it work fine now, even though i change any lock screen setting.
I determined it was lock screen bug.
Hi,
I've tried to change settings in clock type and then reboot.
It worked for one day...
misteurz said:
Hi,
Since i've updated my Oppo Find X5 Pro on Android 13, i have this issue:
I can unlock my phone with fingerprint only one day or two. After that, the fingerprint icon disappear from the unlick screen and I have to reboot my phone to make it work again.
It's a strange issue because i still can open apps with fingerprint...
Do you have any idea to help me?
Click to expand...
Click to collapse
have you found a way to fix it? i have the same issue on oppo find x5
Nope, the only fix I've found, is buying a galaxy s23 Ultra

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