This was also posted in the huge Official forum, but it is probably worth repeating here where people seeking tips and tweaks can find it. It applies mainly to using Input A (Computer) on the HS51, but you can use it with HDMI as well to see if you are getting all the pixels. The patterns can be used with any HTPC or display.
The attached zip file contains a 1280x720 pixel bitmap file that you can set as your Windows desktop background. It is a 1x1 pixel B&W checkerboard which includes corner markers at 1, 5, and 10 pixels. Set this as your windows background/wallpaper and you can insure that you are getting the full 1280x720 pixels displayed.
If you see any interference patterns using Input A, use Menu, Signal, Adjust Signal, Vsize and Dot Phase to reduce or eliminate them. If you can't see the 1 pixel corner markers, use Signal, Adjust Signal, Shift to move the image around. Once you have it adjusted you must turn off "Smart APA" under the Function menu, otherwise the next time you turn on the PJ it will change the settings. You can always click the APA button on the remote if you want the PJ to adjust the settings, but it never provided the perfect settings for me (although it will get close).
To set this as your background, right click on the Desktop, select Properties. Open the Desktop tab and click Browse. Find the file and select it.
Using this method I was able to get 1 to 1 pixel mapping on a few different 1280x720@60Hz settings from the HTPC, so it may not be necessary to get Powerstrip if your graphics card already supports this resolution and frequency. However, page 57 of the manual lists the officially supported "preset signal #56" settings for 1280x720 if you are using Powerstrip.
The zip also contains some GIF patterns that you can load into an image viewer. 1 pixel vertical lines, a 2 pixel grid pattern and 2 pixel diagonal lines. If you can view all of these with no interference patterns you have the optimum settings. You must make sure you are viewing these GIF images at 100% or FULL size. They are 1386x788 pixels in size, so if you don't have scroll bars on a 1280x720 display they are being scaled down. The Windows Picture and Fax Viewer that opens in XP if your right click a GIF and select Preview has an "Actual Size" button at the bottom that will work.
pixel mapping test patterns.zip 20.521484375k . file