Remove a case or screen protector that presses on the display, dry the screen and restart the device. Test whether one app or the whole touchscreen is affected. Use the model-specific restart controls below; a factory reset should wait until important data is backed up.
Differential
Likely causes of “Samsung Galaxy S touchscreen does not respond”, and how to tell them apart
- 1
Charging interference
What separates it Ghost touches only while the phone is plugged in
How to confirm Charge with the Samsung adapter and cable, and compare with the cable unplugged
- 2
A case or protector pressing on the edges
What separates it Ghost taps along the border
How to confirm Remove both and test
- 3
A software glitch after a patch
What separates it Touch failed after an update
How to confirm Force restart by holding Volume down and the side key for about ten seconds, then install the next patch
- 4
A display connection fault
What separates it A green line or an unresponsive strip that stays in every mode
How to confirm The panel needs a Samsung repair
- 5
Moisture on the glass
What separates it Erratic taps after rain or washing hands
How to confirm Dry and wipe the screen
- 6
A cheap charger adding noise
What separates it Ghost touches only on one adapter
How to confirm Use Samsung's adapter and cable for a day
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether the ghost touches happen only while charging
- Whether a screenshot shows the line
- The charger and cable used
- The One UI version and patch date
Try in this order
0 of 6 completedSeparate the two problems
ReversibleGhost taps point at charging, accessories or software; a colored line points at the display.
Unplug and test
ReversibleIf the ghost touches stop unplugged, try another cable and adapter.
Take the case and protector off
ReversibleTest with the phone bare.
Force restart
ReversibleHold Volume down and the side key about ten seconds until the Samsung logo shows.
Test in Safe mode
ReversibleHold Power off, tap Safe mode.
Screenshot a line
ReversibleA clean screenshot with a line visible on the screen proves a panel fault.
Model-specific
What is true of this model and not of its siblings
- Samsung Galaxy S26 screen or touch input is not working correctly
- Two different things get called a touch problem on the Galaxy S26, and they have different causes. The first is ghost touching, where the phone taps things on its own. Owners describe it on the S26 Ultra while the phone charges, with a keyboard that types by itself, stopping when the cable is unplugged, and some say it began after a security patch. Samsung's reply is the usual list, starting with a force restart. The second is a colored line, and reports of a green line on the S26 Ultra are a hardware fault in the connection between the board and the display, which software cannot clear, though early reports were also found to be exaggerated. Work out which you have before you do anything else.
- What the reports say
- Ghost touching while charging, sometimes after a security patch, and green lines reported mostly on the S26 Ultra.
- Display repair
- A line that persists in every mode is a display connection fault.
Stop boundary
When this stops being a self-service repair
- !A line that shows in Safe mode and in a screenshot is a display repair
- !If ghost touches continue unplugged with no case, ask Samsung to test the panel
- !Back up before any repair
Evidence ledger
Sources behind this answer
Samsung's touchscreen checklist.
Ghost touches while charging and Samsung's reply.
Force restart, protector and case checks for the S26.
Per-model battery, charging, chip and display for the S26, S26+ and S26 Ultra.
Exact questions
Common questions
Why does my S26 type by itself while charging?+
Owners report ghost touching while charging. Try Samsung's adapter and cable and a force restart.
Is the S26 green line a hardware fault?+
Reports describe it as a connection failure between the board and the display, which needs a Samsung repair.
Do all S26 phones have the green line?+
No; reports concentrate on the S26 Ultra and some early reports were found to be exaggerated.
What is a force restart?+
Hold Volume down and the side key about ten seconds.
Should I install every update if my S26 has ghost touches?+
Owners saw ghost touches begin after a security patch and others saw them end after the next one, so install updates but watch the first days after each.
Can a screen protector cause S26 ghost touches?+
A poorly applied protector or a case pressing on the edges can; remove both for a test.
screen touch: model differences
Also covered: Samsung Galaxy S20 Ultra family.