2011 Mitsubishi 3D DLP Owners Thread (740/840 series) - Page 128

And, if I may add, it'll probably still look better than your current picture.

yes definitely. And remember even though it won't be perfect at the beginning and end of the lamp life, it will probably not be discernable with anything but a meter.

Yes definitely. And remember even though it won't be perfect at the beginning and end of the lamp life, the difference will probably not be discernable with anything but a meter.

Replaced the bulb after 3100 hrs and WOW, what a difference! Even the wife said "Whoa, what happened to the tv, it's so bright". We will definitely be replacing the bulb more often now that we know this. Thanks everyone!

Now turn the contrast down to about 40.

These are the settings I used from a fellow 82840 user and I find them to work very well in my light controlled room.

82840 possible calibration settings post

I have the exact same problem. It only happens when watching a 3D movie (which, is working properly)

^^^^

Kinda hard to tell which post you're replying to without a quote - what exactly is your problem?

alright so how does one go about resetting the lamp timer on this set. googling the question doesn't provide a correct answer nor does searching this thread. unless i'm typing in my keywords incorrectly that is.

Can anyone give me instructions on how to correct the geometry on my 73740? I can get into the service menu and the geometry correction, but unsure how to proceed from there.

Everytime I see that post I really don't understand where you are coming from.Perhap you are making bat cave reccommendations.

You really want to see at least 30 ft lamberts even in a dark room and if the set is used during the day as well, 35-45 ft lamberts is better. 50 ft lamberts in a bright room might not be enough.

On the really big sets getting enough light out of them is challenging and means short lamp life. I am currently running 58 contrast and I would run more but the nearly 2000 hour lam'ps color is not balanced enoughany longer to do so. I use a Lumagen Radiance XS and 125 Point color autocalibration. If my lamp had 200 hours on it not 2000, it I would run the contrast at abut 53-54.. the Radiance and ChromaPure can get the colors for all the 125 points it calibrates to average about 1.0 dE. I let white chip above 245 and colors start to clip at 241-242..

This is done in Bright Picture Mode with the lamp on Bright. It absolutely makes the out of box setup a bad joke. What you can do with the built in controls is quite limiting as the set is not linear across saturation levels.If you get it right for the normal 75 percent stimulus and 100 percent saturationl. It will be way off at other levels of stimulus and saturation. Only an outboard video processor that uses 3D LUT (Look up tables) can really fix it.

With the high contrast your dymanic range is much better, the VP allows the gamma to be a a flat 2.22 and I use the factory brightness setting. All the dynamic range and highly accurate color gives you nearly as much light as the set will put out and dead on color with the snap that only proper gamma can give.The picture quality is just in another dimension from what you think the set can do.

I was using a DUO video processor which could only handle calibration for one saturtion level........ Mits really has some goofy internal processing in their CMS. The DUO does allow you to work with Bright Picture Mode which is a wide gamut more and it allows you to get the color points right at the gamut edge. But again, only for one level of saturation and stimulus, virtually every color at every other part of the gamut is wrong.

just replaced the lamp on my 92840 anybody know how to reset the hours for the new lamp? Right now it just shows total hours.

Thanks

There does not seem to be a way to reset just the lamp clock. I am coming to the end of what I consider the useful of life of my second lamp on a 92840 and I am maybe 20 hours shy of 4000 hours.

Greetings:

Were you able to reset the lamp hours after replacing the lamp? if so how?
Was your lamp directly from Mitsubishi or generic lamp?

Thanks.
Ekpen.

It is a set timer not a lamp timer. It's kept on the main board and there is no known way to reset it, unless the main board is replaced with a new one.

I had my Mitsu 92840 calibrated by Chad Billheimer ('Chad B') at the end of last month. I purchased this set primarily for its size rather than performance: the wife doesn't care whether the picture is great, only that she can see it from the kitchen about 40 feet away. Chad created both a properly calibrated mode for me and a 'bright' mode for the wife. Chad was able to improve the picture quality greatly, correcting the horrendous factory grayscale to almost perfect and bringing in an almost equally bad color gamut. After living with it for a month I am still impressed. Just watched the re-mastered "Lawrence of Arabia", looks fantastic.

Chad was doing three sets for me on the same day but he took his time with each one, answered all my questions, and generally did a great job. I will definitely have him back out when I need to do this again.

I have been milking the 2nd lamp on my 92840 a bit longer than I expected. I was pretty sure I was at the end of its useful life when I hit 4k on the TV's clock. I noticed when I changed video cards on my HTPC that I was able to keep the greyscale and gamut pretty close even though I cranked up the contrast. I am letting white clip around 240 and colors are clipping some just above 235. I maybe loosing something in the highlights but for the most part it still looks good and I have gotten another 400 hours. I am stil seeing about 27 ft lamberts... Two more weeks and I will order a lamp.

I am kind of waiting for the next cut of ChromaPure which I believe is imminet. It has some minor math fixes that should improve the 125 point calibration with the Lumagen. There is some new firmware for Lumagens as well that tweaks the caibration a bit.

As to the picture quality with this tired lamp, greyscale is still reasonable, gamut is dead on for hue and saturation with the luminance kind of drifting off. I am using madVR on the PC now for both broadcast andCeton provided cable through JRiver MC 18. I am also playing my ripped local content the same way. MadVR looks very nice using Jin 3 AR and then I also have a Darbee Darblet sitting between the Radiance and the 92840 doing its thing... I still need that 10 inch stand... soon I hope.That would be icing on the cake and actually let me extend lamp life a little as I would be viewing more from the sweet spot. When you stand up even with a 15" stand you can see the picture brighten.

If you had suggested to me I would have mearly 4500 hours on my set at 17 months I would thought that crazy. I have a 5 year warranty on this set so 20k hours does not seem unreasonable to me anymore. It looks like I can get/ tolerate 2500 hours on a lamp. That maybe only 9 months at my usage rate but I can live with 10-12 bucks a month for lamp costs.
All in all this is a vastly better TV than my 2009 82837 which is in a spare room and sees very little to no use these days. Getting 28 ft lambert out of an aging lamp was just not really workable with the 82837. That was a struggle with decent color at 400 hours.

The clear screen has its plusses and minuses but it is big part of why this is such a vastly better set than the 2009 82"

I would love to see the charts from the 92840 calibration. Chad has such an excellent reputation. The Mits CMS is pretty crummy and it would be interesting to me how he handled the competing demanand of getting adequate light out of the set while keeping color reasonable. Even with the Radiance Video Processor and 125 point calibration the Radiance is fightting with a CMS that only wants to play nice at one stimulus/saturation level. The Radiance can fix it fairly well but eventually I might go to an EEColor box that can set color at over 4 thousand points. I already have the signal generator in the Radiance and decent meters. I am kind of nervous about investing in any more processing gear since everything will go 4K in the next year or so and virtually noting I have besides HTPC is up to that. Lumagen is pretty good about offering board swaps when they do a technology change, so hopefully that is not a lame duck device. I know my Darbee is 1080P limited.. The meters and software don't really care, so that is good.

If you are able to post charts, can you provide lamp age and brightness and contrast settings as well. I would also be curious which mode he used as a starting point. I work from Bright which is oversaturated and the Radiance brings the colors to the correct saturation point. I found Natural and Advanced left Blue undersaturated. I don't know if that is typical of the 2011s or just a quirk of my set.
Edited by gtgray - 4/27/13 at 9:20pm

Anyone have good settings for 82740? Thanks