Maxess Plasma (MP32T) Dead. Red standby light On only.

[JasonZaps]

Maxess Plasma (MP32T) Dead. Red standby light On only. Picture and Audio good up until fault.

[JasonZaps]

I have replaced all primary electro caps, even though no signs of leaking or popped top. Opto couplers tested fine.
The power switch (not the mains switch) go direct to the A/V aux board in the centre of the plasma with a control IC and the main power supply circuit is at the right with no signs of damage or any burnt smells.
The TV went off by itself while watching it, was perfect pic and audio until then.