Originally Posted by Derek Dean
Just to clarify, it seems that each TV is individually tuned at the factory (via the service menu) so that they all leave the factory performing more or less the same. Since the calibration required to achieve this level of uniformity is slightly different for each set, the numbers you see in your service menu will likely be slightly different than some other G20/25 owner's numbers.
That is why D-Nice has so thoughtfully given his setup as a discreet number of clicks up or down for each setting, and also why it is CRITICAL that BEFORE you change anything in the service menu that you either photograph each of the 8 pages in the service menu or write down all the numbers. That way you can always return to your original settings if you get confused and need to start over.
And of course it's vitally important to do the adjustment for both HD and Std sources because, at least in my case, broadcast TV comes in 2 flavors. Most of my over-the-air primary channels are in HD, but the sub channels (8.2, 25.2, 46.2 etc) are all in Std 480i, so I used my best primary HD channel to set my color for the HD matrix (I used the Tonight show, but Wheel of Fortune or David Letterman works good too), and then switched to a sub channel to set the SD matrix.
Personally, for those faint-of-heart, or who are not willing
to be methodical, follow the directions EXACTLY, and keep good notes as they go, I would recommend NOT
going into the service menu. Just use the the Custom Picture mode and adjust the color in the pro-settings menu. You can get very close doing that, and you don't have to worry about doing a separate setup for both HD and SD channels.
However, I love tweaking, so I followed D-Nice's instructions to the letter and got very good results, but not perfect...... so I returned everything back to the original settings. Then I slowly and methodically began playing with each of the cut and drive (drv) settings (Red,Green, and Blue) until I got a good feel for what each did. I found that the cut settings adjust the relative balance between the 3 primary colors, while the drive settings adjust the intensity of each color present in the image. I was formerly employed as a professional color photographic printer, so I already have a good understanding of color. I like using the flesh tones for my color adjustments, while watching both light areas and dark areas for fine-tuning.
After break-in, my G25 exhibited a fair amount of green and yellow tint, so I simply kept slowly dialing out green and adding blue, just a few clicks at a time
. Then I would save it by turning off the set, turn it on again and watch for a while, and then adjust a bit more as needed. The first couple of times I got a bit to far off, so I simply adjusted the settings back to the original start points and started over. After about an hour I got the color almost perfectly tuned.
By the way, I found it's very important to get your brightness, contrast, gamma, panel brightness, etc. set correctly first, because that can affect how things look, and make sure that if you are going to be using the Custom Picture mode that you have all the colors in the Pro-settings menu set to 0 before starting the tuning process..... and above all, make sure that your color temp is set where you want it BEFORE you start.
What's neat is, once you understand that each Color Temp has it's own set of service menu adjustments, you come to realize that this gives you 5 separate completely tunable setups. That lets you tune the color differently for 5 different components if you like, but still allows you to use the Custom Picture mode for each component to adjust gamma, panel brightness, etc. Very flexible indeed! Again, not for those who are easily flustered, but lots of fun for those who like tweaking.
Of course, now that I've got it tuned, it seems to look great using that one setting for both broadcast TV and my Blu-ray/DVD player, both day and night. Go figure
I do love my G25.