u/augustaklug

Query Identification: 01098172

Description:

My Galaxy Tab S10 FE Wi-Fi has a strange touchscreen issue. After a reboot, finger touch works perfectly and the touchscreen passes the Samsung Members diagnostic with no dead areas or missed inputs.

However, after the tablet has been locked/asleep for a while, touch still works normally on the lock screen — I can swipe to unlock and interact with lock-screen widgets — but immediately after unlocking, finger touch stops responding completely. The S Pen continues to work.

The tablet was originally purchased in China with CHN firmware (X520ZCS8CZF2). On the original Chinese firmware, the issue was slightly different: finger touch would sometimes stop working after using the S Pen, but locking/unlocking the tablet usually restored it.

I later clean-flashed official Samsung international OXM firmware. I am currently on Android 16 / One UI 8.5, build X520XXS9CZG3. The device is stock, with a locked bootloader and Knox 0x0.

The problem can now occur even without using the S Pen.

Things I have tried:

Clean installation of official Samsung OXM firmware

Updated to X520XXS9CZG3

Tested touchscreen with Samsung Members immediately after reboot — passes completely

Tested without case, keyboard cover, or other magnetic accessories

Tested without using or attaching the S Pen

Restarting temporarily restores normal finger touch

Confirmed that touch still works on the lock screen when the issue occurs

Device Name: Galaxy Tab S10 FE Wi-Fi

Device Model Number: SM-X520

Best regards,

u/augustaklug

I’m having a very strange touchscreen issue with a Galaxy Tab S10 FE Wi-Fi (SM-X520).

The tablet was originally bought in China and came with the Chinese CHN firmware (X520ZCS8CZF2). On that firmware, finger touch worked normally until I used the S Pen. After using the pen, finger touch would sometimes stop working, but locking and unlocking the screen would usually bring it back.

I have since clean-flashed the official international OXM firmware, and I’m currently on:

SM-X520

Android 16 / One UI 8.5

X520XXS9CZG3

Stock firmware, no root, locked bootloader, Knox 0x0

After a reboot, finger touch works perfectly. I also tested the touchscreen immediately after reboot using the Samsung Members touchscreen diagnostic, and the entire screen registers touch normally with no dead areas or missed inputs.

However, after the tablet has been locked/asleep for a while, the touchscreen still works normally on the lock screen — I can swipe to unlock and interact with lock-screen widgets — but as soon as I unlock the tablet, finger touch stops responding completely.

The S Pen still works when this happens. I also confirmed that the problem can now occur without using the S Pen at all.

I’ve tested without the keyboard cover, case, or any other magnetic accessories, so those don’t seem to be the cause.

Has anyone seen this on the Tab S10 FE/S10 FE+, S9 FE, or another Galaxy Tab? The fact that touch works perfectly after reboot, passes Samsung Members diagnostics, and still works on the lock screen makes me suspect a software/input-state or sleep/wake bug rather than a defective touchscreen.

Any known workaround or fix?