I had my meter on my TV yesterday and noticed some strange behavior when switching between picture modes.
My original intent was to develop daytime calibration. Since I have a very bright room during the day, I was going to start with 65ftL light output at 100IRE and see how it looked. After adjusting the the basic controls to obtain this target, I got curious about the 100IRE light output of the Vivid and Sport preset, so I switched over and measured them (Sport measured brightest at 118ftL). Anyways, when I switched back to ISF Expert2 to continue, I was no longer at 65ftL @100IRE - it was much higher. I continued taking measurements and noted that the light output was dropping slowly with each reading. After 2-3 minutes it finally settled back down to the original 65ftL I had before switching a super-bright picture mode. I repeated this process many times with the same result. I found that the only way to get ISF Expert2 to immediately 'recover' from viewing an extremely bright picture mode was to cycle the power on the TV.
So, my conclusion is that my 47LD520 can't make an immediate change between picture settings that are drastically different from one another. I am wondering if this indicates something is wrong with my set, or is normal LCD behavior, or is common behavior amongst the LG LD series.
I would really appreciate it if someone else with a meter (Phase
) would try this and let me know if you see the same results.