CurtPalme.com Home Theater Forum

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

Got my G70...and I notice what appears to be dark flecks of dust only on the green tube. Makes me think it's green pigment from the c element. It is definitely not on the outside of the housing...it is behind.

I'm wondering if exposure to cold could cause this? or transport? or what?

What is between the green c element and the outer glass which I can touch? Is there glycol in there? Or is it behind the c-element? I'm not an expert in the field of lc....maybe I'll have to drain the glycol?

Again...it's only on green. Red and blue are perfect, and it wasn't there last week.

I tried to take a pic by my camera phone just doesn't capture it.

Tom.W · Joined: 09 Mar 2006 Posts: 6635

Try replacing the glycol in the Green tube.

Looks like the price has gone up ! Shocked

http://www.mcmelectronics.com/product/20-4275

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

I have a bunch of glycol here...any idea what happened to it? Did transit jar some dust or something loose? Very strange...

Tom.W · Joined: 09 Mar 2006 Posts: 6635

Does it look like air bubbles or contamination ?

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

The Fungus is upon you.

CIR Engineering · Posted: Sun Dec 13, 2009 3:43 pm Post subject:

It's not from the c element.

Remove the lens with the four shiny screws that surround it at the base (don't remove the black Alan screws). With the lens removed, check to see if the dirt is in the lens or between the c element and the tube. When you discover that the dirt is between the c element and tube, you can remove the c element and remove the contamination.

Between the c element and tube is the glycol coolant. You must remove the tube and stand it upright or the coolant will all spill out all over the place when you take off the c element. If you are bold (this is how I do it), you can leave the tube in and stand the projector on its ass end with the c element facing up (have lots of rags handy just in case.

Remove the c element cover with the four Alan screws. The c element will likely be stuck in place. There are little holes between the c element and bellows at either two or four locations. Use a small screw driver to lightly pry the c element free. Set the c element aside and use a syringe to suck the pieces of dirt out of the coolant.

Slowly reinstall the c element and tip it as you do so to trap the least amount of air as possible. If the tube is out of the projector bleed the air out. If the tube is still in the projector don't worry about the air as it will not hurt anything anyway.

All set.

craigr

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

any idea what this stuff is? I guess shipping knocked it loose?

I was looking with the lense off...it looks like small debris that could be wiped away, only it's behind the glass. Is the glass the c-element or no?

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

Got pictures?

Tom.W · Joined: 09 Mar 2006 Posts: 6635

The plastic c element is L4 in the drawing.

http://www.google.com/patents?id=KWZ7AAAAEBAJ&printsec=drawing&zoom=4#v=onepage&q=&f=false

Most likely when you moved the projector you stirred the fine particles that normally settle to the bottom of the gylcol chamber. If you wait a few days the fine particles should settle to the bottom. If you see any fungus you will need to replace the glycol. Try not to touch the front or rear of the plastic c element as it scratches pretty easy.

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

that makes some sense...this was on a ceiling for quite a while...now it's on my table in my basement. I suspect it may clear up in a couple of days too. I'm not keen on messing around with it too much at this point.

I was able to replace the front glass on my PG...but I also didn't care if I screwed it up. I really do care if I screw this thing up...it's freakin' pristing...and ken whitcomb calibrated to boot Smile

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

I just took the lenses, boards and remote...plenty of room Smile

I'm not afraid of messing with the magnetics...but opening up an LC tube housing...etc. I've never done that.

Mark_A_W · Posted: Sun Dec 13, 2009 10:02 pm Post subject:

There shouldn't be any junk in the housing.

However. I have seen a few C elements that got some had some sort of chemical reaction/corrosion occur in the optical coating. From memory, this was on the outside face, not inside.

Can you take a pic Ben?

And it's dead easy to remove the C. Make a simple jig with a hole in it to bolt in your vice, holding the tube pointing straight up.

Undo the screws holding the C element in, take off the retaining plate, and pop out the C.

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

it looks like dust...darker colored dust in the glycol. I tried a pic, but I can't get it to show what it is I'm seeing. I'll get my brothers camera and post a pic.

So, tube straight up and the pop off the top piece with an allen key? Might glycol spill out over the top? Hopefully not?

Mark_A_W · Posted: Sun Dec 13, 2009 10:40 pm Post subject:

No, the glycol should stay put. Terry does G90 tubes in the projector, with the whole thing pointing up.

It's Marquees and sometimes Barcos that have issues with the glycol usually. I have heard of a G70 glycol going a bit cloudy, but that's all.

Oh well, not too hard to fix.

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

yah, well....error code 21...that might be harder to fix! Sheesh!!! Crt is NOT for the faint of heart...new thread on error 21.