AVS Forum Special Member
Join Date: May 2008
Location: San Francisco - East Bay area
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 188 Post(s)
Samsung service menus should never be diddled with. You are asking for trouble. If you do the wrong thing (and it is supremely easy to do the wrong thing because the remote doesn't work as logically when you are in service menu mode) you can literally ruin a Samsung TV.
AVS is littered with pleas for help from people who messed-up their TVs by going into the service menu. They typically say something like "I know everybody says not to go into the service menu, but I thought I could do it anyway because I'm a technically savvy person. But something changed and now my TV is unwatchable."
You cannot fully evaluate black level performance unless you have a test pattern with individual digital black levels... meaning 16, 17, 18, 19, 20, 21, etc. Patterns with % steps (like 0, 1, 2, 3, 4, etc.) jump a little more than 2 digital levels for each 1% difference. So if the PLUGE pattern has -2%, 0%, and 4% bars you are never seeing what is happening at digital 17 - 23 (or thereabouts). For consumer video, you want to make sure all your sources are in 16-235 mode. If you are using YCbCr 4:2:2 you should be, by definition, in 16-235 mode but some products allow non-standard settings. If you are in RGB mode, you can choose between 0-255 and 16-235. Since consumer video uses 16-235, to avoid inevitable rounding errors, you should stick with 16-235 mode if you are using RGB formatted video from consumer sources (cable, satellite, Blu-ray movies, etc.). You may find a digital level pattern on some test/setup discs, but I don't use any of them often enough to remember which ones have it and which do not.
You didn't include enough of the model number to indicate whether this is a plasma or LCD TV (there's no such thing as an LED TV, they are just LCD TVs with LED backlights unless it is an OLED TV which are still quite rare). Plasma TVs have brightness limiting circuits to prevent the TV from overheating when too much of the screen is bright. When you use a pattern or image (like a hockey game) with a lot of white area, you'll see a lot of brightness limiting that might lead you to think something was wrong with a the whites if you were looking at the right sort of content.
"Movies is magic..." Van Dyke Parks
THX -- ISF -- HAA