If you are going to ISF calibrate, try calibrating the set yourself before ISF so you can see how close you are to ISF calibration. Write down the settings too, so you can compare it to the ISF settings. This will show if the money spent on ISF calibration is really worth it.
I did all the DIY tweaks I could to my 46" Mits. Using AVIA and all the tweaks from "the spot" electrical focus, geometry alignment, colors, SVM...etc.
Even after doing all that, an ISF calibration went far beyond and my picture is now stunning. I had it ISF'd back in February.
Tweaks like adjusting the grey scale and getting as close as possible to 6500k across the screen require a computer and special software. Both of these tweaks are very important and cannot be done using AVIA and the like.
An ISF calibration is very worth the money spent.
...and yes, put at least 100 hours on it first.
Here is what I can remember that was done...
1. Removed the glare screen
2. Manuel Focus
3. Electrical Focus
4. Disconnected SVM (scan velocity modulation) wires from the circuit board
5. Set Grey Scale
6. Set Overscan
7. Tweeked the Geometry
8. Centered the image
9. Adjusted all the user settings; sharpness, color, tint, etc...
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