Damage symptoms
Start here when you can describe what the screen is doing but do not yet know why. Compare the closest symptom first, then move into the most likely cause.
Match what you see to the closest row and open the linked guide.
What you see
What you see
What you see
What you see
What you see
Likely issue
Mistaken for
Route
A black patch, dark area, or spreading spot under the screen
Usually points toward internal pressure damage, liquid intrusion, or heat-stressed layers rather than a single dead pixel.
Often confused with a dead pixel, dirt, or a screen protector bubble.
Lines that showed up after pressure, a squeeze, or a flex event
Lines that begin after physical stress are much more likely to be panel damage than a random software issue.
Often confused with driver problems, GPU issues, or hinge-angle quirks.
Touch acting on its own, drifting, or firing random taps
Digitizer instability after damage can lock you out or make the device unsafe to control.
Often dismissed as lag, a temporary touch bug, or safe to keep using.
One strip, corner, or section of the touchscreen no longer responds
Local touch failure often means physical screen damage even when part of the display still looks normal.
Often confused with dirt, a case edge, or a minor annoyance.
Use these to classify visible damage. They do not replace hands-on inspection or policy decisions.
Route type
Route type
Route type
Route type
Route type
When it fits
Stop rule
Cannot prove
Symptom pattern matching
The visible pattern is clearer than the event history behind the damage.
Stop comparing symptoms once one guide clearly fits and the next safe move is obvious.
Exact failure layer (digitizer vs panel vs cable) without hands-on inspection.
Cause narrowing after a symptom match
You identified the visible pattern and now need pressure, water, or heat context.
Stop at cause guides once the next step is backup, evidence, or service—not more theory.
Which cause triggered the symptom if the device history is unreliable.
Urgent touch instability (ghost touch or dead zones)
Touch is erratic, unsafe, or one area no longer responds while access still matters.
Do not keep stress-testing when backup or safer access should come first.
Whether touch will recover without replacing the panel or digitizer stack.
When to stop comparing symptoms
The device, your data, or your claim matters more than naming the damage perfectly.
Move to action pages or cause guides instead of endless symptom checking.
Warranty approval, repair quotes, or how long the panel stays usable.
Move into cause guides, tests, or urgent action paths once the visible pattern is clear.
After you identify
After you identify
After you identify
After you identify
After you identify
After you identify
After you identify
What it means
Next step
Route
Pressure or flex event is the strongest explanation
Bruising, lines after squeeze, or lid-pressure fits a pressure damage story.
Open the pressure damage guide to narrow the internal failure pattern.
Liquid exposure or staged worsening is plausible
Spills, rain, condensation, or delayed failure often track water damage.
Open the water damage guide before the panel is pushed further.
Heat, sun, or thermal load preceded the symptom
Dim zones, discoloration, or touch drift after heat point toward thermal stress.
Open the heat damage guide to compare the likely failure mode.
Screen is stable enough for controlled evidence
The device is readable enough to test without creating extra risk.
Run the matching screen test to capture repeatable evidence.
You need backup or evidence before the pattern changes
Access, data, or warranty proof may matter more than further symptom comparison.
Open the action path that protects what you need first.
You need photos or files before touch or display fails further
Ghost touch, spreading bruises, or liquid exposure can close the backup window fast.
Back up or document before the visible pattern changes.
FAQ
Answers on pattern matching, safe next moves, and when to stop comparing symptoms.