Hi five Astracat! Together we've cracked it, appreciate the help. 
Changing U6301 has resolved the problem, TV now back up and running. Just to confirm for anyone looking to fix the same power supply showing the same symptoms and they should subsequently stumble upon this post. The dc voltage to pin 7 of U6301 should be around 14V dc when working correctly. If you have the skills to lift the pin 7 re-measure the voltage at the PCB sniff point and see if it goes up to 15V which supports the IC failure as I found.
Hi, with interest I have been reading this tread as I also have a faulty power supply board. It also has a faulty U6301, apart from some other components. Where could you get the replacement for U6301? I am living in Coventry and have difficulties getting hold of these components.
I have put the list of components that I need here:
Q6301 -> STW12NK80Z
U6301 -> UC3843A
R6310 1206J10 (smd) smd size 1206, 10 Ohm (1/8 watt min.)
R6311 20K (smd) (1/8 watt min.)
R6327 1K (smd) (1/8 watt min.)
D6304 4146 (smd) (1N4148 Fairchild)
R6312 -> 0,27 Ohm 2 Watt
R6301 -> 68K 2 Watt
Q6302 -> MPSR44 (MPSA44G ON Semiconductors)
D6303 -> 4148 (smd) (1N4148 Fairchild)
Optional:
CY6201 -> 2200P, 250V (YL)
CY6202 -> 2200P, 250V (YL)
If anyone could help me out getting these components together, I would be very grateful, or even if somebody could help me with soldering of these smd components, that would be fantastic.
some pictures of my PSU can be found here:
http://www.mijnalbum.nl/Album=WQDMNCI3thanks,
Michael
