An S24 Ultra that misses scrolls or taps things on its own usually has one of four things: a screen protector that is too thick or has an air gap, moisture or oil on the glass, a poor charger, or a One UI bug. Owners on Samsung and XDA forums describe missed scroll inputs, frozen screens and phantom touches, and one repair thread traced phantom touches to a screen replacement. Start with the protector, then open Settings, Display and check Touch sensitivity and Accidental touch protection.
Differential
Likely causes of “Samsung Galaxy S24 family screen or touch input is not working correctly”, and how to tell them apart
- 1
A thick screen protector or an air gap under it
What separates it Scrolls are skipped and taps land late, worse near the edges
How to confirm Remove the protector and test; a gap stops the digitizer's field reaching the glass
- 2
Moisture, oil or dirt on the glass
What separates it The screen acts on its own or stops responding when damp
How to confirm Dry and clean the display, then test
- 3
A poor charger
What separates it Phantom touches only while plugged in
How to confirm Try a Samsung charger
- 4
A One UI bug
What separates it A fault that appeared after an update
How to confirm Install the newest update
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether it happens with the protector off
- Whether it happens only while charging
- Whether it began after a screen replacement or an update
- The *#0*# touch grid result
Try in this order
0 of 4 completedRemove the protector and clean the glass
ReversibleTake off any protector and wipe the screen dry.
Check the two settings
ReversibleOpen Settings, Display, turn Touch sensitivity off and Accidental touch protection on, then test.
Test a Samsung charger
ReversibleCharge on a Samsung charger and cable and watch for phantom touches.
Run the touch grid
ReversibleDial *#0*# in the Phone app, tap Touch and trace the grid.
Model-specific
What is true of this model and not of its siblings
- Screen
- GSMArena lists a 6.8 inch 120Hz LTPO AMOLED display with Gorilla Armor glass and a 2600 nit peak.
Stop boundary
When this stops being a self-service repair
- !If the grid test fails on a bare screen, book a screen repair and ask whether the part is genuine
- !If it follows a third-party screen replacement, return to that repairer
Evidence ledger
Sources behind this answer
Samsung's touch checks.
Owners describing missed scroll inputs.
An owner thread on touch failures.
A repair thread on phantom touches after a replacement.
Exact questions
Common questions
Why does my S24 Ultra have phantom touches?+
Moisture, a poor charger, a thick protector and a third-party screen replacement all appear in owners' threads; test in that order.
Can a screen protector cause missed touches on an S24 Ultra?+
Yes. Reports list tempered glass that is too thick, or with air gaps, because the digitizer's electric field then fails to reach the screen. Remove it before you suspect the phone.
What do Touch sensitivity and Accidental touch protection do?+
Both are in Settings, Display. Touch sensitivity raises the screen's response for protectors and gloves, and some owners switched it off to stop phantom touches; Accidental touch protection ignores touches when the phone is in a pocket or bag.
Why did phantom touches start after a screen replacement?+
An iFixit thread on this phone describes phantom touches after a replacement, which points at the replacement part or its fitting. Go back to the repairer with the touch grid test result.
How do I run the touch grid test?+
Dial *#0*# in the Phone app, tap Touch and trace your finger along the grid. Boxes that turn green mean the digitizer saw the touch.