I have a sony bravia kdl-40w605b.

There is no picture but the sound works fine at least I can hear the beeps from the menu even though I cannot see it.

The backlight is working fine.

This would normally be put down to a t-con failure however there appears to be no dedicated t-con board. The t-con cable goes directly from the mainboard to the screen.

I have replaced both the mainboard and t-con cable with no joy.

Is there something I am missing? Could this be the power board or something else?

Update.

So new power board caused 6 red blinks so I'm guessing that I either got sold a duff board or it's the wrong board despite having the same model number.

Im including a picture of the boards now.

So I figured it out. I feel like an idiot