Except for bulb replacement, Why should I NOT buy rear projection HDTV?

....and if I don't need to hang it on a wall.

"deadendDan" wrote:
...and if I don't need to hang it on a wall.

Some people see a "rainbow effect" in
the picture. Also, they can be a bit noisy.

Chip

--
-------------------- http://NewsReader.Com/ --------------------
Usenet Newsgroup Service $9.95/Month 30GB

On Feb 6, 5:15 am, wrote:
Some people see a "rainbow effect" in
the picture. Also, they can be a bit noisy.

That only applies to DLP systems. My rear-projection Sony does not
have any moving parts to create rainbow effects or noise.

I've owned it for 1.5 years and the bulb is going strong.

Victor, a very happy Sony SXRD owner

Peter A wrote:
In article ,
says...
No problem, DLP is the way to go for Large screens. The only noise We have
scene came from the source.The picture is so sharp, way above Plasmas, the
digital noise from some programs is showing up, still not the TV. Rainbow
effect, only if your eyes are spinning around. Colors great, brightness
very good .
Lowest price fora 55-70" screen. NO screen burn in ever.


A good DLP indeed has a very impressive picture, but they all have
significant light fall-off from the center to the edge of the screen.
This is just the laws of physics at work, and AFAIK no one has found a
solution - although it may not be noticeable for some people.

Also, I understand that the better units have 3 DLP chips, one for each
color, rather than just one chip that is multiplexed.



In rear, or front, projection, don't overlook LCoS. Usually brighter
than DLP, faster than DLP, and no color wheel. Smaller lamp size --
mine uses a 110 watt lamp and pulls a max of 215 watts.

Only moving parts are the fan and (on JVC sets) the iris. This isn't
the 3-chip DLP system that Mitsubishi attempted a couple of years ago.

LCoS RPTV comes from Sony and JVC. 2008 will leave just JVC as Sony
leaves the RPTV business.

--
pj

Pete wrote:

LCoS RPTV comes from Sony and JVC. 2008 will leave just JVC as Sony
leaves the RPTV business.

Hi PJ

I have the JVC rear projection TV and have no complaints what so ever.
Of course if I had to replace the bulb it would be expensive and right
now I am now completing year 2 and the picture is just great. From
what I gathered it was the biggest bang for the bucks at the time next
month it will be 2 years and I got a 56 inch for approx 2 grand.

Lee

On Feb 5, 10:49*pm, "deadendDan" wrote:
...and if I don't need to hang it on a wall.

I have a 3 chip (no iris) lcos front projector, JVC model DLA-RS1.
The picture is fabulous and absolutely no motion trails, defined
pixels, rainbows, etc. The only thing I can say is if you go with
front projection you must be able to control the room light and get it
dark, but the reward is great. A 1.3 gain screen allows very wide
viewing angles.

As for rear, the larger rear projection sets Ive seen also are very
good, especially beating out any plasma or LCD for motion trails
(motion trails are my current pet peeve and I seem to be especially
sensitive to them). I think motion trails are less on projectors
because the physical pixals are arrayed on a chip the size of a
postage stamp then projected out optically, diminishing the trails,
whereas an LCD or plasma has the pixels arrayed in actual size making
the trails amplified if the pixels cant change state fast enough.
They can tolerate more ambient light than front projection but look
best in subdued light.

The biggest advantage of course is any projector types have truly big
screens if you can accomodate them. But color wheeled DLP units can
have their issues.

deadendDan wrote:
...and if I don't need to hang it on a wall.





Well, it seems to be a dying breed if this is any indication:

http://www.engadget.com/2007/12/27/s...tv-production/

--
John McGaw
[Knoxville, TN, USA]
http://johnmcgaw.com

"Pete" wrote in message ...
Peter A wrote:
In article ,
says...
No problem, DLP is the way to go for Large screens. The only noise We
have scene came from the source.The picture is so sharp, way above
Plasmas, the digital noise from some programs is showing up, still not
the TV. Rainbow effect, only if your eyes are spinning around. Colors
great, brightness very good .
Lowest price fora 55-70" screen. NO screen burn in ever.


A good DLP indeed has a very impressive picture, but they all have
significant light fall-off from the center to the edge of the screen.
This is just the laws of physics at work, and AFAIK no one has found a
solution - although it may not be noticeable for some people.

Also, I understand that the better units have 3 DLP chips, one for each
color, rather than just one chip that is multiplexed.

In rear, or front, projection, don't overlook LCoS. Usually brighter than
DLP, faster than DLP, and no color wheel. Smaller lamp size --
mine uses a 110 watt lamp and pulls a max of 215 watts.

Only moving parts are the fan and (on JVC sets) the iris. This isn't the
3-chip DLP system that Mitsubishi attempted a couple of years ago.

LCoS RPTV comes from Sony and JVC. 2008 will leave just JVC as Sony
leaves the RPTV business.

--
pj



The "less moving parts" argument is a bit misleading. While DLP sets do
have a color wheel, and some brands have been notorious for having lots of
bad color wheels, many DLP sets have had ver very low failure rates in the
color wheel. The also lack the complex light path with dichroic mirrors and
polarizing filters and extra lenses. The DLP devices themselves have also
had a far lower failure rate than any of the LCD, or LCOS and its variants.
ALL three chip systems develop some problems with components in the light
path at some point and need internal cleaning of the light engine at some
point. This is the dirty little secret that proponents of three chip
systems either ignore, don't understand, or have not yet experienced.
Anyone who tells you that it doesn't happen because the light engine is
sealed and cooled simply has never worked on them. A three-chip DLP system
would suffer from the same issues.

When built right, DLP is a quite elegant and simple solution, and can be
extremely reliable. Ulltimately, however, I expect that flat panel direct
view LCD will be the most reliable technology. But even there, there are
lots of crappy products out there that break regularly. Build it right and
it will work, regardless of the technology. Build it like a cheap POS and
it will break, regardless of the technology. Samsung proved that with DLP
and lots of off-brand LCD and PDP panels are priving it as well.

Leonard

John McGaw wrote:

Well, it seems to be a dying breed if this is any indication:

http://www.engadget.com/2007/12/27/s...tv-production/



Well, I think Sony may have lost their proverbial shirt making LCD rear
projection engines. My Hitachi 42" LCD developed a burned yellow spot
in under 3 years and the whole light engine had to be swapped out for a
refurb. Yes, it was made by Sony. Many of these units failed in my set
and countless others due to a poor engineering design that lacked the
proper airflow for cooling. They will be refurbing these things for
years, and it is no doubt costing them plenty.

If I had known Sony made the guts of the Hitachi, I probably would have
avoided it. I do have a nice new Toshiba DLP that is nice, so far.

dan

dan wrote:
John McGaw wrote:

Well, it seems to be a dying breed if this is any indication:

http://www.engadget.com/2007/12/27/s...tv-production/



Well, I think Sony may have lost their proverbial shirt making LCD
rear projection engines. My Hitachi 42" LCD developed a burned
yellow spot in under 3 years and the whole light engine had to be
swapped out for a refurb. Yes, it was made by Sony. Many of these
units failed in my set and countless others due to a poor engineering
design that lacked the proper airflow for cooling. They will be
refurbing these things for years, and it is no doubt costing them
plenty.
If I had known Sony made the guts of the Hitachi, I probably would
have avoided it. I do have a nice new Toshiba DLP that is nice, so
far.
dan

I've had my DLP WS73727 for almost 2 1/2 years, and I've been more than
happy with the picture/performance. I just replaced the bulb about 2 weeks
ago (under warranty). Did notice a picture quality drop off about two weeks
before the bulb blew out.....I had a feeling she was going to go.....

They ended up sending me two bulbs, complete with housings.....