How to test in 3 steps
- 1
Click "Start" to go fullscreen
A grid of squares fills the screen. Tap or swipe across each square to paint it green.
- 2
Swipe the entire screen
Sweep each row horizontally, then each column vertically. Pay attention to the four edges and corners, where touch most often dies.
- 3
Try several fingers at once
Place five fingers on the screen and read the touch count in the corner. A good panel registers 10. Press Exit or Esc to finish.
Reading the results
- 100% of cells painted, 10 touch points, no self-painting cells: good touchscreen.
- A vertical or horizontal strip that never paints: a broken digitizer channel. Usable but annoying, and it tends to spread over time.
- A corner or edge not responding: digitizer separation or impact damage. Inspect the glass edge for hairline cracks.
- Cells painting with no touch: ghost touch. A serious fault, the laptop will tap things on its own.
- Fewer than 5 points: poor driver or digitizer. Ask the seller to reinstall the driver and test again.
Tips for 2-in-1 laptops
- Test touch in both laptop mode and tablet mode (folded 360°). The touch cable runs through the hinge and can fail in only one position.
- If a pen is included, test it in all four corners and check the offset between the tip and the line. More than 2 mm needs calibration or a new pen.
- Touchscreens use 10–20% more battery, so run the battery check right after this test.
Frequently asked questions
The page says there is no touchscreen but I know there is one+
Touch may be disabled in Device Manager (HID-compliant touch screen set to Disabled) or the driver is broken. Sellers of used laptops sometimes disable it to hide erratic touch. Ask for it to be enabled before buying.
One area never paints+
A dead touch zone, usually at an edge or corner after a knock, or where the digitizer has separated from the glass. It cannot be repaired on its own; the whole touch display assembly has to be replaced, which is expensive.
Squares paint themselves without being touched (ghost touch)+
Erratic touch, common when the screen has been pressed, got damp, or a poor-quality charger is connected. Unplug the charger and retry. If it persists it is a hardware fault; do not buy.
Only 1 or 2 touch points are detected+
Windows laptop touchscreens normally support 10 points. Only 1–2 means a wrong driver or an old digitizer, which hurts pinch-zoom and drawing.