Originally Posted by HomieG
Suppose that your question is posed to me. I guess I could have been more specific in my post. He said he tried with his Auto Iris On or Off. I recommended it not be on auto. There are five (5) other settings that are basically manual iris control. He didn't say which he tried. My recommendation was that he try all of the other 5 non-auto settings.
Question - Rather than putting down other folks replies, do you have a constructive recommendation for the poster who started this sub-thread?
Since he tried it with auto-iris off, then he must have tried it with one of the other five settings. There is no auto-iris off setting aside from selecting one of the 5 fixed iris settings.
Aging or bad bulb is most likely the culprit.
But, I'll retract my "Doubtful" for the power saving mode comment on the prior page, but only because I wasn't aware that there was an Auto setting there. I've always had it set to "On" or "Off". Since the manual is unclear about what "Auto" does, perhaps it is automatically switching from Off to On after the set has warmed up (in gwnelson's case about an hour later). Still doubtful it is responding to room light levels, which is how I read RobbinMerrit's comment, I would imagine a manual would be more explicit about that (and do not recall ever having read about the XBR2's having such a capability), but since the manual does not say one way or the other... Past posts have suggested that bulb flicker can possibly be reduced or eliminated by turning power saving mode off; some have indicated that this did help, some have indicated it didn't make a difference.
So gwnelson, imho it's either some side effect of using the Auto setting for Power Saving mode (try changing it to Off if you haven't aready done so and see if that makes the getting darker after an hour part go away), or your bulb is just getting old and it's doing it on its own for some reason.
If your bulb is in general too dark then you should probably try setting your iris to one of the higher levels (I've always had mine set at "Low", I cannot stand the automatic iris settings) and see if that makes a difference. And if all that makes little/no difference, then there's all those adjustments and settings to play with in the Picture Settings menu (I posted mine not too long ago, basically use Custom picture mode, do a Reset, turn most of the extra stuff off (including the auto iris), stick with the basics (Picture, Brightness, (Color, Hue, Sharpness)), try out the settings I posted a bit ago or adjust with the help of a calibration disc.) If after all that it's still too dark, must be time for a new bulb.