wrote in message
...
This thread is a bit confusing. To got one person talking about a color
wheel and another talking about a dichroic mirror.

The twain shall never meet. there can be a DLP without a color wheel, but it
will be a three panel and it will have dichroic mirrors. Though I don't
believe it has been done, there could be an LCD with a color wheel, but it
would need one superfast refresh panel.

Why don't you just post the model number.

You have two completely different scenarios here, and one main point, is the
red dull in the OSD generated inside ?

If it is a three panel of whatever type, and the fault appears in the menus,
you are looking at a fried dichroic. If it is a one panel it is most likely
the color wheel but a physical inspection is warranted.

If it only has a three section color wheel that's one thing. They just are n
ot very likely to fail in that way. If they do you will see it, there should
be a band where the light was. If it has a seven segment color wheel, yes it
could quite have darkened but it's not all that likely.

Incidentally one brand of these does get a fault in which the red section of
the seven segment wheel breaks free and then not only is the color screwed
up, the thing vibrates like all hell.

Why no model number ? Or did I miss it ? I do believe I read the thread
here. Hell, I might have the service manual on my harddrive. sure you have
it, but I don't know what this thing is and we don't even know if it's a DLP
or LCD or lycos or what.

If it's a seven segment color wheel and the red looks good, it probably is
in the signal processing. That is a whole different basllpark.

J

+++++++

The dichroic is the parabolic reflector behind the discharge lamp, letting
through IR and reflecting visible light. 3 sector colour wheel. If I can rob
a colour wheel from a defunct projector I will try its red sector in the
light path of this one just to check the white areas go red etc in the
output image.
As putting a normal mainly white image through the projector from a graphics
package, ramping up the red slider to 200 so the pc monitor image is redded
out , the projector image is no change in the white areas , so I suspect
signal processing area fault