I have a 2005 Samsung lcd (65") model s6187w that is powering off by itself. Once it does this - after watching tv for a couple hours- I turn it back on and it will turn off again more frequently (after about 20'). is the tv just old? ive tried reconnecting everything.
It sounds like an issue that will require service. If you have tried unplugging it for 5 minutes and the issue occurs on all sources and inputs, the next step would be service.
You can find a service center using the following link: Link
