Samsung LE40C530 no backlight

[JLB]

Hi folks, I'm new to this forum, wonder if can contribute.

By now, have this baby in my hands, and my experience and electronics equipment aren't that far.

Facts:
Inverter board replaced was first suspicion of the owner, who ordered one and replaced it. No results.

When I got access to the unit, checked the power board BN44-00340B.

PFC-OUT reads only 155V. I don't have any information on how much should be there, but my guess it should be way more isn't it?

Mosfets QP801 and QP802 show 155V at Gate (pin 1) and Drain(pin 2) ? I'm puzzled to have the same readings in both drains and gates, I wonder those are damaged and internally shortned.

Best thing would be to replace the full power board, but I wonder is there anything else I could check?
BTW, I don't have an oscilloscope, just a multimeter...

No 800V output at CNI801, actually getting 0V here.

I wonder this rings any bells on you from your past experience?

Many thanks!