Quick SupportTouch Screen Test
Three checks in one: wipe the grid to find a patch that doesn't respond, see how many fingers the screen actually registers, and draw a line to see whether it wobbles. Works on a phone, a tablet, a touch laptop — and with a mouse or trackpad if that's what you're testing. Press Full screen to test the whole panel, edge to edge.
Drag a finger slowly over the whole box, edge to edge, like you're wiping a window. Cells fill in as you pass. Anything still pale when you've covered the lot is a spot the screen didn't feel.
0 of 0 cells touched.
Put several fingers on the box at once and hold them there. Each one should show up as its own ring. Most phones and tablets handle five or ten; a laptop trackpad usually reports far fewer, which is normal.
Nothing down. Most at once so far: 0.
Draw slow straight lines and a few circles. A healthy screen gives you a smooth line that follows your finger. Steps, spikes, or a line that jumps to somewhere you never touched is a digitiser fault — and that's worth a photo.
Line thickness follows pressure where the screen reports it.
What it can and can't tell you
- A band that never fills is the classic dead strip — usually a cracked digitiser or a lifted ribbon connector, and usually fixable.
- Touches landing somewhere else entirely(you press left, it registers right) points at the digitiser rather than the glass. On a phone that's often the screen assembly; on a laptop it can be the cable.
- Phantom touches with nothing on the glass— the rings appear on their own — is a failing digitiser or moisture behind it. Bring it in before it starts opening things by itself.
- It can only see what the browser sees. Press Full screen and the test covers the whole panel, which is the only way to check the very top and bottom — though on an iPhone or iPad the browser keeps its own bars whatever we do, so a dead strip hiding under those still can't be tested from here. This test also can't tell cracked glass from a failed digitiser — they feel identical from a web page.