I know nobody asked for this, but without a service manual I had to spend WEEKS searching the internet for this information and finally found an obscure note in a post on a usenet newsgroup from 4 years ago. I figured I could summarize it and in the future anyone who runs a search on this site would pull it up pretty easy. If you don't know, the Samsung RPTV's I've dealt with have a weak 9-pt convergence grid available through the standard menus. This is so coarse it's often impossible to even get the 9 points to line up, let alone the rest of the screen. After allowing the set to warm up for awhile (for me the set literally would not ALLOW me to open the advanced convergence settings until it had been running for 15-20 minutes): Press Mute, followed by 1, 8, 3 on the remote. This should bring up a full screen convergence grid. Once you're here there are no on-screen instructions or status display so you're on your own. Here's what you need to know: Button "1" - all convergence settings to NO correction Button "2" - return to factory default settings Button "3" - return to your previously saved settings Button "7" - Adjust red convergence Button "8" - Adjust green convergence Button "9" - Adjust blue convergence (note that there is no visual confirmation of what color you are adjusting so you just need to try it and see the grid move... pressing 7,8, or 9 has no otherwise visible effect, which is why I couldn't figure this out myself) Button "+100" - Red gun on/off Button "0" - Green gun on/off unmarked Button to the right of "0" - Blue gun on/off IMPORTANT - Under flip/slide cover - "Add/Erase" button - save current settings I believe pressing "display" will switch you back to your source material so you can observe the effects of your settings; pressing "display" again takes you back to the grid. Finding this information made my RPTV's picture quality increase 100000000000000x. My convergence and geometry were TERRIBLE out-of-the-box, and I endured it for FAR too long. This has changed my whole viewing experience. I still need to adjust the blue gun's focus, as I have some "blue haze" around white text on black screen, but at least it's equally distributed on all sides! Hope this helps some others who are looking for this information.