Originally Posted by CPanther95
I've searched the thread and found a number of you that have adjusted for overscan, but not a lot of details on the specifics.
This is meant to be humorous, right? I'm not trying to be facetious, but this subject has honestly been discussed in great detail in several threads... especially in a number of recent threads posted by new XBOX owners seeking to tweak their Sony sets (e.g. XBR960) to eliminate overscan.
Assuming you're into the service menu (and are familiar with how it is entered, used, saved, and exited), the primary recipe approach is fundamentally twofold: (1) use the VPOS and VSIZ items in the 2170D-1 group, and the HPOS and HSIZ items in the 2170D-2 service menu group, to adjust the "background raster" (aka "canvas") in both horizontal and vertical directions. Then (2) in the MID3 group you use 0 (VDHP horizontal position), 1 (VDHS horizontal size), 2 (VDVE vertical position) and 3 (VDVS vertical size) to manipulate the 1080i/720p "image" on top of the "background" (i.e. within the "background raster").
2170D-1 and 2170D-2 are used to adjust the "canvas" to reach to the physical edges of the screen, so that the image then placed on top of it can utilize all available screen real estate. MID3 is used for the 1080i and 720p image size and placement adjustments, within the background raster area set by 2170D-1 and 2170D-2. You position and size the image over the background so that it is fully visible and reaches to the extreme edges of the background for 0% overscan. Then you enlarge it just a bit more in all four directions (using the test pattern on your screen as the guide) to "crop" out the video noise which you may see at 0% overscan, losing perhaps 1-2% of the image in this final "overscan" adjustment.
As you get into each part of the adjustments, clicking up or down one unit at a time so that you see the precise results of your tweak, you focus on getting the extreme outer edge of the test pattern rectangle visible on your screen. When you're done (at 0% overscan), the complete rectangle should be totally visible on all four sides. No wasted screen, and nothing eliminated (at 0% overscan).
There is an assumption that you have a proper 16:9 test pattern on your screen, the best of which can be found attached to this post
which if you can connect your PC to your HDTV is ideal. If you have a video card like ATI Radeon 9800 Pro, it has a second DVI head and you can connect it to your Sony with a DVI-to-HDMI cable setup. Or, you can get the ATI DVI-to-component adapter and connect the second head to your Sony with component video cables.
Otherwise, you can use Avia or DVE DVD's to display geometry and overscan test patterns, though at 480p. Using DVE, you can go to Title 12 (Display Setup Patterns) and then Chapter 17 (1:33 overscan pattern), with the latter "spread" to 16:9 by the MODE button on your remote.
"Blow-by-blow" as well as instructions for service menu entry, exit and use, can be found in this post
A bit more editorializing can be found in this post
Hope this helps.