lg lcd tv rz32lz55

[stu]

this lg lcd tv is driving me mad..soon as you power it up it runs with a great picture for approx 2 seconds then the screen goes blank..i have changed the inverter board but the fault still remains..cant find anything obvious so anyone got any ideas or circuit diagrams would be great.
i cant hear any sound either but it does not stay on long enough to find out! :wacko:
i am sure it has chassis number ml041a

many thanks