I have a 3 yr. old PN64D7000 that just had both the power board & main board replaced ( tv kept turning on & off).
The picture is now very dark, I have what I think is the setting I set up 3 years ago. I set these after the the repair but the picture is still very dark. Here are my settings:
Movie mode,
Cell Light 18,
Contrast 89,
Brightness 50,
Sharpness 10,
Color 51,
Tint G51/R49,
Color Tone Warm1,
Noise filters Off,
HDMI Black level Normal.
Advanced Settings:
Black Tone Dark,
Dynamic Contrast Low.
Everything else at the default setting
I have raised the brightness to 100, still dark picture.
Any suggestions?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic