Zenith LCD, D60WLCD

[[email protected]]

OK I got close to 30 year experience, and I want to try something. I
want to get into the light engine of this set.

I don't expect it to be easy and I might not succeed, but I might learn
something.

I have read case histories of yellow splotches. Now another and I own
one that has a blue splotch. This unit also says change lamp, which
means it's the kind that might blow up. With a lamp replacement I am
sure the splotch will still be there, but it raises an interesting
point.

If any abberation can affect one color, like my blue splotch or the
yellow spots, whatever, and the fact that both problems can happen, it
is evidenced that contaminants in the airflow caused it.

This means there might be hope. Since these symptom are possible it is
evident that it is a three panel light engine, just what do you think
the incoming air hits first ? In an LCD projector, to affect color,
like the blue, you need to affect it's plate, or the dichoric mirror
associated with that color.

I would think that yellow spots would be on the plate and blue would be
on the mirror.

Don't bother admonishing me, I have nothing to lose. If I get this SOB
looking good I'll get a hepafilter and figure out how to fit it. The
problem is always the blue plate or mirror, and I bet a million cyber
dollars that it's the first thing to get hit by the incoming air.Look
at how fast it happened too.

To know how to really fix one of these will be a valuable asset indeed.
I also think it is our future, if we stay in this field.We are going to
have to get by with absolutely nothing from the manufacturers. Survive
or perish, that's why I want to take this thing apart.

Has anyone ever tried this ? I got nothing to lose here.

JURB

 

[Bob Loblaw]

I have done several of these over the past few weeks. Hitachi actually has a
procedure posted on their website. They suggest blowing the dust out with
clean, dry air and cleaning the lcds and filters with special lint-free
swabs. I have not had the courage to try the swabs. I expect that would
create more problems than it would solve.
I remove disassemble the light engine only so far. remove the driver board,
lamp housing and air duct ass'y on the bottom. Then you can blow clean, dry
air right through past the areas where the dust accumulates. Unfortunately,
the unit has to be almost completely reassembled before you will know if it
worked or not.
I believe success depends on being careful, thurough, having as clean an
area to work in as possible and more than a little luck.

This has worked for me. I caution anyone who may attempt it that they
consider the risks. Here in Canada, light engines cost me anywhere from
$1200. to $1500. I shudder to think what's going to happen when these things
are out of warranty.

 

[Mike Berger]

They probably won't be available anymore by the time you need one
anyway.