AVS Special Member
Join Date: Jun 2008
Location: Sudbury, Ontario, CANADA
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Most drift is in the first 1000 hours of viewing.
After that, it depends on the quality of the electronic components. When I look at boards inside the TV using 10 Volt capacitors, in a 12 Volt system, and with the periodic spikes, brown outs, offs/ons in a short period of time, and with most people without UPS protection, values change. Ever calibrated? The night before - dead on the mark - next day, not so dead on the mark. As time passes, the re-scan results will vary.
Current UN65HU9000 I calibrate - CMS values change very little: a click here, a click there, but the 11/21 Point Greyscale, totally different story. Will it ever settle down as well? Time will tell. My 5 year old LG 55LHX - values over 5 years have never been consistant. Blues rise, Reds fall. The older they get, Blues decrease and now Reds rise. Wife's LHX, currently the Greens are dropping. So re-calibrating keeps your set at the top of it's game. Besides, gives me something to do after the wife goes to bed at 10PM, whereas I'm up to 1 to 3AM.
Also, remember the electronics in your TVs boards were purchased under the bidding process! Then to, engineers don't necessarily get it right. etc.