Hisense U7N Mini-LED TV apps will not open, update or install

The checks in more detail

Check the network by testing another app that needs internet, and if Wi-Fi is the issue, restart the router, use the 5 GHz network and check the signal. Set Date and time to automatic in Settings, System, Date and time, as a wrong clock stops apps from signing in. Check Settings, System, About, System update for software, since Hisense releases fixes that repair app behavior. Then work on the app. In Settings, Apps, See all apps, choose the app that fails, tap Force stop, then Storage and cache, and Clear cache. If that does not work, Clear storage, which signs you out and resets the app, so have your password to hand.

You can clear cached data for all apps in Settings, System, Storage. Update the Play Store and Play services, found in the Play Store under your profile, Manage apps and device, and update the app itself. If an app is still misbehaving, uninstall it, restart the TV and reinstall it from the Play Store. The TV has limited storage, so remove apps you do not use, and keep at least one gigabyte free, since a nearly full TV is the commonest reason for crashing apps. Some apps stop supporting old versions, so check that the app supports your Google TV version.

If none of this works, a factory reset in Settings, System, Reset, Factory data reset erases the TV's accounts and apps, so use it last, then sign in again. If a single streaming service is the only one failing for everyone, check its status page. Think about what has changed. If problems started after a new router, check the 5 GHz band and DNS; after a TV update, check for a newer one; after installing many apps, check storage. Keeping a short list of recent changes narrows the cause, and a TV that was fine last week almost always has one clear difference to find.