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.
Start with what you see
You do not need to know yet whether the cause was pressure, water, or heat. If you can describe what the screen is doing, start with the visible pattern and narrow it down before guessing.
Start here if the screen is showing:
A black patch, dark area, or spreading spot
Start here when the screen shows a visible change you can point to right away.
Lines that showed up after pressure or a flex event
Start with the pattern before you decide whether pressure, moisture, or something else is behind it.
Touch acting on its own or becoming hard to control
Erratic touch, ghost taps, or drifting input belong here before you jump into repair guesses.
One part of the touchscreen no longer responding
Dead strips, corners, or keyboard areas are easier to identify by symptom before you worry about the exact cause.
If your bigger problem is backup, access, or documenting the damage before it changes, switch to the next-step guides instead of comparing more symptoms.
Common symptoms
Pick the closest visible pattern first. You can always move to a cause guide after the symptom makes the likely explanation clearer.
Visible pattern
Start here when you see a black patch, bruise, or dark area but do not yet know whether pressure, water, or heat is the strongest cause.
Usually points toward internal pressure damage, liquid intrusion, or heat-stressed layers rather than a simple software issue.
Visible pattern
Start here when vertical or horizontal lines appeared after a squeeze, flex, lid-closure event, or transport pressure.
A good starting point when something physical happened but the exact internal failure is still unclear.
Visible pattern
Start here when the screen taps, swipes, or types on its own after damage, moisture exposure, or another physical event.
Useful when you need to separate digitizer instability from broader panel failure and decide whether backup comes first.
Visible pattern
Start here when one part of the touchscreen no longer responds and the usable area is shrinking.
Helps you decide whether you are dealing with localized hardware damage, a cover-layer problem, or damage that needs service.
Possible causes
Pressure, water, and heat can create similar-looking problems. Use the symptom first, then move into the cause guide that best fits what happened.
Likely cause
Check this when a squeeze, flex event, bag pressure, or closed-lid accident is the strongest explanation once the symptom is clearer.
Likely cause
Check this when spill history, condensation, or staged worsening makes moisture the stronger explanation.
Likely cause
Check this when the symptom appeared after direct sun, trapped heat, or another clear heat event.
Quick check
Run tests when the device is still usable enough to capture evidence before you commit to a likely cause.
Before you keep testing
These guides should help you identify the problem, not trap you in endless checking once the device, your data, or your claim matters more.
Keep the next move clearer than the theory.
Next move
Use these symptom guides to get oriented, then switch to backup, documentation, or a cause guide as soon as that becomes the more useful next step.
Reviewed and maintained by Jacob DymondLast reviewed 2026-04-14
Founder, ScreenDetect
This page is meant to help you name the symptom quickly, compare the most likely cause, and move on before avoidable data loss or extra handling makes the situation worse.
Source basis