How the watch works
Tap Start ghost-touch watch, keep five minutes or pick another length, and press Start watch. You get three seconds to put the device down before the timer starts. From then on, each touch the screen reports adds a line to the log, showing how many minutes and seconds into the watch it came and where on the glass it landed as a share of the width and height, and a red numbered ring appears on that spot.
The page asks the browser not to let the screen sleep. If it locks anyway or you switch apps, the watch ends early and tells you why, since a page in the background gets no touches.
Narrowing down the cause
An empty log after five minutes is a clean result. If touches turn up, change one thing per run and compare the logs:
- Power: one run on battery, one on the charger, and one with a different cable or plug. Apple’s troubleshooting suggests trying another outlet, cable or charger when a screen misbehaves with an accessory attached.
- Accessories: take off the case and screen protector, and wipe the glass dry.
- Surroundings: move the device to another room, away from speakers, routers and other electronics. Microsoft’s Surface guidance names interference from nearby equipment as the first thing to check for phantom touches.
- Outside the browser (Android): the developer option Show taps draws a circle wherever Android registers a touch, so you can see whether phantom touches also appear on the home screen.
If the rings keep landing in the same corner or band across every run, write down where: it is the most useful detail to give a repair shop.
Sources: Apple Support: If the screen isn’t working, Microsoft Support (Surface), Android Developers: developer options.