Turn off TV with remote control. Wait a few moments. With the remote control press the following keys in sequence: Info -> Menu -> Mute -> Power. I repeated this twice and the Service Mode screen then appeared. Select the 'Option' menu item. Select 'Factory Reset'. Wait for the TV to restart. After 30 minutes the TV had not restarted so I turned it on with the remote and I was presented with the setup screen. Followed the setup. Went to Smart Hub to find all my apps back and working!
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