Error message/Switching off

Question

My friends Philips TV continually switches off to stand-by mode, could be on for a couple of mins or couple of hours before switching off to stand-by mode, also has and "ERR NICAM" message at bottom left of screen, not sure if related to the switching off issue above,TV is a Philips blackline  I think, could be 5 or more years old, pic and sound fine when working Thanks