When the screen of a Galaxy S24 misses taps, registers touches that never happened, or lets a colored line creep down the panel, the useful first question is whether the fault moves with the software or stays with the glass. A touch problem that comes and goes, changes with the case or the protector, or disappears in Safe mode is software or accessory. A line that stays in every mode, in screenshots and in the recovery screen is hardware. S24 owners have reported green and pink lines after updates, so it is worth taking a screenshot of the line: if the screenshot is clean, the fault is in the panel, not the picture. Work through the order below before you book a repair.
Differential
Likely causes of “Samsung Galaxy S24 screen or touch input is not working correctly”, and how to tell them apart
- 1
A case or protector pressing on the edges
What separates it Ghost touches near the border, worse when the phone is held tightly
How to confirm Remove both and hold the phone loosely for a few minutes; if the ghost taps stop, the accessory was the cause
- 2
Moisture, cream or grease on the glass
What separates it Taps drift or register in the wrong place after washing hands or rain
How to confirm Dry the glass and wipe it with a clean cloth, then run the touch test again
- 3
A touch layer that glitched after an update
What separates it Touch fails in one app or after waking, and restarts cure it
How to confirm Restart, install the newest patch, and test in Safe mode to rule out an app that draws over the screen
- 4
Touch sensitivity set for a thick protector
What separates it Taps need pressing hard through a protector
How to confirm Settings, Display, Touch sensitivity: switch it on if you use a screen protector
- 5
A display connection fault
What separates it A green, pink or white line, or a strip that never responds, in every mode and in screenshots
How to confirm The panel needs a Samsung display repair; software cannot clear it
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether the touch is dead, ghosting or a visible line
- Which part of the screen is affected and whether a screenshot shows the same line
- The case and protector fitted and when
- The One UI version and security patch date
Try in this order
0 of 6 completedStrip the phone down
ReversibleTake off the case and the protector, remove any sticker over the screen and hold the phone loosely.
Dry and clean the glass
ReversibleWipe the screen with a dry, clean cloth and wash your hands before testing again.
Run the touch test
ReversibleOpen Samsung Members, Get help, Phone diagnostics, Touch screen and follow the prompts to draw over the whole panel.
Restart and update
ReversibleRestart the phone, then Settings, Software update, Download and install.
Test in Safe mode
ReversibleHold the power key, touch and hold Power off and tap Safe mode; if the fault stops, an app is responsible.
Take a screenshot of the line
ReversibleIf a colored line shows, screenshot it. A clean screenshot proves the fault is in the panel, which is what the repair agent needs to see.
Model-specific
What is true of this model and not of its siblings
- The S24 display
- A 6.2-inch Dynamic AMOLED 2X panel at 120 Hz under Gorilla Glass Victus 2; a line that appears with no drop or water is a connection problem inside the module.
- Reported lines
- Samsung's forums and news sites report vertical colored lines on S24 and S23 phones after updates; if your phone shows one, take a photo and a screenshot to compare before you visit a service center.
Stop boundary
When this stops being a self-service repair
- !A line that appears in Safe mode and in a screenshot is a display repair
- !A cracked screen should be repaired promptly to avoid spreading damage
- !Back up with Smart Switch or the cloud before handing the phone in
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why does my Galaxy S24 have a green line?+
Owners report green and pink lines after updates; it is a failing connection to the display panel and the line stays in every mode, so a Samsung screen repair is the fix.
How do I stop ghost touches on the S24?+
Remove the case and protector, dry the glass, and turn on Touch sensitivity only if you use a protector; ghost touches that persist after a restart in Safe mode point at the panel.
Is the S24 screen covered by warranty?+
Coverage depends on age and cause; Samsung can confirm after an inspection, and a line with no sign of impact is the kind of fault they examine.
Can I fix a touch problem with a factory reset?+
Only if the cause is software; try Safe mode and the touch test first because a reset removes all data.