I am looking at buying a rear projection HDTV. I'm partial to Hitachi,
but am looking at the Sony KDS line, and the Mits DLP's. From a tech
stand point, which would tend to be the long term runner between these
technologies as far as dependability? Any thoughts would be greatful.
Thanks group.

[This followup was posted to sci.electronics.repair and a copy was sent
to the cited author.]

In article om,
says...
I am looking at buying a rear projection HDTV. I'm partial to Hitachi,
but am looking at the Sony KDS line, and the Mits DLP's. From a tech
stand point, which would tend to be the long term runner between these
technologies as far as dependability? Any thoughts would be greatful.

One item to know is that most DLP's (unless you are willing to spend
$$$$$$$$$$) have only a single mirror chip. It generates the 3 colors by
having a little wheel with colored lenses spin between the light source
and the mirrors to generate the colors. You can often see a rainbow
streak on fast movements, or if you move your head.

Some newer DLP's are using LED's to generate the colors. Some newer
DLP's are spinning the wheel faster to minimize the rainbow effect.

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Thanks for the info, this is also the only draw back I could find with
a DLP. Haven't seen any negative comments yet on the SXRD. I plan on
spending about $3,000 total, and would like to buy the top of the line
for what this will get me in rear projection HDTV. Thanks again.

Andrew Rossmann wrote:
[This followup was posted to sci.electronics.repair and a copy was sent
to the cited author.]

In article om,
says...
I am looking at buying a rear projection HDTV. I'm partial to Hitachi,
but am looking at the Sony KDS line, and the Mits DLP's. From a tech
stand point, which would tend to be the long term runner between these
technologies as far as dependability? Any thoughts would be greatful.

One item to know is that most DLP's (unless you are willing to spend
$$$$$$$$$$) have only a single mirror chip. It generates the 3 colors by
having a little wheel with colored lenses spin between the light source
and the mirrors to generate the colors. You can often see a rainbow
streak on fast movements, or if you move your head.

Some newer DLP's are using LED's to generate the colors. Some newer
DLP's are spinning the wheel faster to minimize the rainbow effect.

They're also adding color segments to the wheel so that each revolution
produces each color two or more times....

jak

In article ,
says...
Andrew Rossmann wrote:
[This followup was posted to sci.electronics.repair and a copy was sent
to the cited author.]

In article om,
says...
I am looking at buying a rear projection HDTV. I'm partial to Hitachi,
but am looking at the Sony KDS line, and the Mits DLP's. From a tech
stand point, which would tend to be the long term runner between these
technologies as far as dependability? Any thoughts would be greatful.

One item to know is that most DLP's (unless you are willing to spend
$$$$$$$$$$) have only a single mirror chip. It generates the 3 colors by
having a little wheel with colored lenses spin between the light source
and the mirrors to generate the colors. You can often see a rainbow
streak on fast movements, or if you move your head.

Some newer DLP's are using LED's to generate the colors. Some newer
DLP's are spinning the wheel faster to minimize the rainbow effect.

They're also adding color segments to the wheel so that each revolution
produces each color two or more times....

What gets me is you have this super-high-tech, HDTV, and it has a
mechanical motor and a spinning wheel in it!! Makes me think of the
original CBS color TV process approved in the US before saner heads
prevailed. It was quickly rescinded and changed to NTSC.
http://en.wikipedia.org/wiki/Ntsc

I have CRT HDTV (direct view), and probably won't update until LED or
similar backlighting becomes more standard. Replacing an expensive lamp
every 2 or so years seems like a step backwards to tube electronics!!!

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.att.net/~andyross

Both are great sets. I sell and service both and each has its pros and
cons. The down side to the SXRD is a more complex optical path inherent in
three chip systems and a history of some color anomolies. We have not seen
any of the latter, but others have reported having problems with color
uniformity. Newer models seem to have less complaints.

In the Mits line get the 731 series if you want to be able to calibrate
color most precisely and for the value point in the line. In the SXRD stick
with the lower end sets for the best value. The higher end sets (XBR) have
a slightly better DRC for 480i sources, but otherwise are not much different
in performance.

Leonard

"Golf" wrote in message
oups.com...

Thanks for the info, this is also the only draw back I could find with
a DLP. Haven't seen any negative comments yet on the SXRD. I plan on
spending about $3,000 total, and would like to buy the top of the line
for what this will get me in rear projection HDTV. Thanks again.


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One item to know is that most DLP's (unless you are willing to spend
$$$$$$$$$$) have only a single mirror chip. It generates the 3 colors
by
having a little wheel with colored lenses spin between the light source
and the mirrors to generate the colors. You can often see a rainbow
streak on fast movements, or if you move your head.

What kind of motor do they use, and what speed does it run? How about life
expectancy? Greater than the lamp?
Just curious . . .
thanks,
Tom

"t.hoehler" wrote in message
m...

One item to know is that most DLP's (unless you are willing to spend
$$$$$$$$$$) have only a single mirror chip. It generates the 3 colors
by
having a little wheel with colored lenses spin between the light
source
and the mirrors to generate the colors. You can often see a rainbow
streak on fast movements, or if you move your head.

What kind of motor do they use, and what speed does it run? How about life
expectancy? Greater than the lamp?
Just curious . . .
thanks,
Tom

It varies with brand. Most would have a life expectancy far greater than
the lamp. A great deal of the concern comes from lots of early failures in
RCA and Samsing sets. In four years of selling and servicing DLP products
(neither of those brands), we have had exactly one bad color wheel motor,
and that was a virtual DOA, well within the warranty period. IME, it is far
less of a concern than optical path problems on LCD and LCOS sets, or
phosphor aging in PDPs.

Leonard

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