TV TURN OFF (by 2 users)

If this happens after it has been on for 5 to 20 minutes and can be turned back on after 10 minutes or so, there is a transistor labelled Q601 whose collector lead has been formed and is too short to project through the solder on the circuit board. When it gets hot it pulls away from the solder.
If this happens right away or after only a few seconds, there is a 3 terminal voltage regulator with 7805 in its part number that may have a low output voltage rather than 5 volts.