LG QNED90T MiniLED TV apps will not open, update or install

The checks in more detail

Close the app and open it again. Restart the TV: switch it off with the remote, unplug it for a minute, and plug it in. Check the connection: in Settings, Connection, check that the TV is online, and run the network test; an app that cannot load is often a network problem, so test another app and the TV's browser. Check that the date and time are set automatically, since a wrong time stops secure services. If the app asks for a login, sign out and in again. Then update.

In Settings, Support, Software Update, check for a TV update and install it, since app compatibility depends on the webOS version. In the LG Content Store, check for an update to the app; on webOS, apps update automatically if the TV is online, and a manual update may appear in the store. If the app is broken after an update, delete it and reinstall it from the Content Store; this clears its cache. If an app is not in the store, it may not be offered on this version of webOS, and you can use another route:

cast from a phone, use AirPlay 2 from an Apple device, connect an external streaming device, or use the TV's browser. Clear the cache of the TV: in the Home screen, edit the apps and clear the data of the failing app where offered. A DNS change in the network settings, to a public resolver, helps some apps load. If an app fails on every network and after reinstalling, check the app's own service status and contact its support; contact LG with the model number for a system fault.