Vestel switches off after 10 secs

[thegasman]

I have a Technosonic 37" screen which has developed a fault where it switches off after about 10 - 30 seconds. While it is on the screen looks fine and I can use the menus. After it goes off the standby light goes off too and it needs to be left a few hours before it will switch on again.

Vestel 17MB15E-7 and 17PW15-8. No obvious damage to capacitors or fuses etc.
Any ideas?

Thanks.