fingerprint sensor not working

[ruggb]

I just installed a screen on my S21+ and the fingerprint sensor does not work. Previous screen worked fine for that. I removed previous fingerprint data, rebooted the phone and tried again. It tells me to cover the area. I have a big thumb, it is covered and damp or dry. There is no screen protector. The fingerprint test indicates DBASE_CAPSENSOR_CHECK failed and reads 0850 to 0890 and should be above 2500. All other tests pass.

Every other post I find indicated DBASE_CAPSENSOR_CHECK and DBIAS_TUNED_DBIAS_VOLTAGE are 0, so it isn't the same issue.

Is it a hardware issue or something else?

[ATH4554]

Wiring came lose

[ruggb]

wouldn't that produce 0 for the CHECK and maybe even the VOLTAGE?

[thatonesmartboi]

Hey I recommend you to clean your fingerprint sensor or take it to the closest samsung service or just use PIN or password

[ruggb]

Cleaning won't change the test results for the CHECK function, now will it?

Yes, my face recognition works fine along with the PIN.

Paying for a diagnosis is and having it "fixed" with another screen is not on my todo list.

If it is a bad screen, I need to return it.

[realaud]

If you install the screen yourself, you may not have properly attached the wiring to the fingerprint sensor. Either return the screen, or try reconnecting it.

[ruggb]

the sensor wires run thru a single display flex cable and the display is fine.

[ATH4554]

Not really because when I fixed mine everything worked except that and I find when I put back together it a wire came off.

[ruggb]

Did you run a diagnostic for the fingerprint? There isn't anything that will come off here. Corroded maybe. The connector on the right is the display connector. About the only thing I can do is move that block with the QR code around a little. It will move the flex in that small connector some. I will try that, but I doubt it will do anything.