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Tip by DJRobx:
"Someone posted a question about the IRIS in another thread, and it received
lots of negative responses due to the horrible default values and lack of ability to
You *can* control the IRIS through the service menu, and it's one of my favorite
features of the set. I can now enjoy my set in any ambient light and not have to touch my
perfectly-calibrated brightness setting.
DISCLAIMER: When doing anything in the service menu, always write down
the original values and don't muck with anything else as you can screw up your set!
How it Works
The Iris is a light sensor that returns a value 0-255 that represents the ambient light
in the room. Your TV can hold 3 different brightness and contrast settings that it will
automatically adjust to as the light changes.
Before you Start
First you need to decide where you want your brightness and contrast values for a dark
room, a lighted room at night, and daylight.
Start with a dark room at night, and adjust the brightnes and contrast controls the
minimum setting. This is 0. Count the number of steps it takes to get to the brightness
and contrast setting you want. Write down the number you get for brightness and contrast,
and label them BR0 and CN0 respectively. (Note: the center is 15, and the far right is 31)
Now turn the lights on, and repeat the above process. Label those numbers BR1 and CN1.
Wait until daylight. Repeat the above process again, and label those numbers BR2 and CN2.
Go into the Service Menu (Menu, 2, 3, 5, 7). Press the <Audio> button until the
display reads "IRIS". Press Video to scroll through the available settings:
CN0, CN1, CN2 (0-31):
Enter the three contrast settings you wrote down by using the up and down arrows on the
BR0, BR1, BR2 (0-31):
Enter the three brightness settings you wrote down.
These are the sensor values at which the set will change brightness settings. For
example, if 0TO1 was 100, and 1TO2 was 200, a reading of 50 would be setting 0, 150 would
be setting 1, and 230 would be setting 2.
Unfortunately, there's no way of telling what the current IRIS reading is. But, in my
environment, I use an extremely low 0TO1 setting (42) and an extremely high 1TO2 setting
(240), there doesn't seem to be a lot of room in between. This is what requires the most
Press <enter> to save the new settings, and you're done! Enable the Iris and
start experimenting with different 0TO1 and 1TO2 values to make the set adjust itself at
the right times based on the ambient light."