I have had two TV's of the same model with the same fault. The 1st one was fixed by changing the two 3kV 5pF capacitors on the HV side of the inverter transformer (C230 & C231). 2nd one worked for a while with this fix but failed again a few days later. I guess there is a fault on the inverter transformer, I'm trying to source one, or a working power board.
Dan.