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Mitsubishi HC5000 color separation (iamges attached) - need advice

1297 Views 5 Replies 3 Participants Last post by  Orta
I just bought HC5000. Looks awesome, but I have noticed when looking very close that there is a slight colour separation, most visible on black-on-white lines, goes to about 1 pixel up and down - green on top and red on the bottom (see attached images).


Projector is 16' away from the 117 diagonal 16:9 white screen. Ceiling mounted and using very small lens shift to the left and significant lens shift to the bottom, although when I reset lens shift the separation on the part of the image that I can see seems to be the same.


I wander whether it's normal for this projector? Can anyone confirm similar artifacts or their absence on their HS5000 (or 4900)? I'd appreciate that.

The store sent a refurbished unit by mistake (252 hours on the lamp), they offered to replace it free or send me a new lamp free. Shipping new unit to Canada means paying duty and taxes, so I agreed to get the lamp, it's easier and seems like better value (got the pj for $1800). Then I noticed this colour separation issue, if it is an issue Maybe it's normal and you can't get perfect convergence at this distance?


See attached images - you can't really see the colour separation when looking from 10 feet away, but see extreme closeup and you can see it there. The source on the picture is DVI from the PC so it's not cable (signal is digital). I have a suspicion it's optics and not colour chips, as white pixels are quite clear, but who knows I'd appreciate your opinions on that, and comparisons. Thanks.


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Quote:
Originally Posted by RomanB /forum/post/14115911


I just bought HC5000. Looks awesome, but I have noticed when looking very close that there is a slight colour separation, most visible on black-on-white lines, goes to about 1 pixel up and down – green on top and red on the bottom (see attached images).


Projector is 16’ away from the 117” diagonal 16:9 white screen. Ceiling mounted and using very small lens shift to the left and significant lens shift to the bottom, although when I reset lens shift the separation on the part of the image that I can see seems to be the same.


I wander whether it’s normal for this projector? Can anyone confirm similar artifacts or their absence on their HS5000 (or 4900)? I’d appreciate that.

The store sent a refurbished unit by mistake (252 hours on the lamp), they offered to replace it free or send me a new lamp free. Shipping new unit to Canada means paying duty and taxes, so I agreed to get the lamp, it's easier and seems like better value (got the pj for $1800). Then I noticed this colour separation issue, if it is an issue… Maybe it’s normal and you can’t get perfect convergence at this distance?


See attached images – you can’t really see the colour separation when looking from 10 feet away, but see extreme closeup and you can see it there. The source on the picture is DVI from the PC so it’s not cable (signal is digital). I have a suspicion it’s optics and not colour chips, as white pixels are quite clear, but who knows… I’d appreciate your opinions on that, and comparisons. Thanks.


That looks like a symptom of misconvergence (MC). This occurs when the R,G and B light from a three chip projector don't converge in the same spot on the screen. Some MC is normal usually on the outside of the screen area.


The attached photo is from a Sony Pearl.


D
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Is this photo of a normal Pearl or does it illustrate a problem that needed to be fixed?
Thanks for the quick reply BTW. I can see this issue with black-on-white only, within abour 4-5 feet from the screen, it's not visible from normal viewing distance (10-12 feet), but I guess it it would not occur, the image might be crisper.

Quote:
Originally Posted by RomanB /forum/post/14116030


Is this photo of a normal Pearl or does it illustrate a problem that needed to be fixed?

I exchanged the unit but I believe Sony's tolerance is 2 pixels on any part of the screen. Not sure about the tolerance of the Mits.


D
I'm not sure what the problem is, but the Epson 1080 had a similar issue people dubbed Rainbow Text . Is it possible for mis-convergence on a 3LCD PJ to create yellow? Not sure if this is the same thing you're seeing, your pictures look mostly like bad convergence, but there's some yellow going on there too.
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