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Hitachi projection TV-green smear??!

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Old 09-19-2008, 10:35 AM   #1
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Default Hitachi projection TV-green smear??!

Hi Guys!
I just joined this awesome forum to ask a question. I recently acquired an old Hitachi projection TV, one of the older models that is housed in a giant wooden case with doors. The model number is CT5582K. The TV works pretty well but there appears to be a green smear on the screen that is not on the front where it could be cleaned. It looks like some kind of stain. I did remove the screen to clean the mirror and the three color guns inside to help reduce a grainy picture I was receiving. That seemed to help a bit.
Anyway, while I had the screen completely off, I thought I could wipe off that green stuff. Trouble is, the screen (both the thick one on the back and the thin one in the front with the ridges on it), appears to be perfectly clean and I can't find even a trace of green stuff. So I put the screen back on and the green is still there.
This is completely baffling me. Where does it go when I take the screen off and why can't I see it to clean it? I didn't want to completely pull apart the two plastic screen pieces because they are held together buy some black, paper/tape like substance.
Any help you guys can provide would be great as I would really like to get rid of the green smears. They are mostly visible when the screen has a light background. Other than this smear and a bit too much grainyness ( I figure it's because this is an older model manufactured in 1989) I love the thing! Please advise what I should do.
Thanks guys and I am happy I found you all!
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Old 09-19-2008, 01:36 PM   #2
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Welcome to the forum!

Did you try holding the plastic screens up to a bright light to see if it is even on the screen itself? That would be the first step to eliminate each part of the light path, and what I would do.

You said you cleaned the three CRT guns, but you didn't say HOW you cleaned it. Did you use just distilled water on a slightly damp cloth? Also how did you clean the mirror? Did you clean it with something besides Windex which can cause streaking?

If you are sure it is not the screen, the mirror, or the lens on the 3 CRT guns, then it is likely the blue or red CRT guns themselves that have gone bad, OR it could be a circuit board that is messing up the signal strength for each color that is causing it.

Is the "smearing" covering the whole screen, or is it always in the same area on the screen that is less than the full screen? If it is not the full screen, then I would think it is somewhere in the light stream and if you cannot find it, you would either have to hire someone to clean it properly, or replace the set.

Hope this helps & good luck!
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Old 09-20-2008, 08:42 PM   #3
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Quote:
Originally Posted by PFC5 View Post
Welcome to the forum!

Did you try holding the plastic screens up to a bright light to see if it is even on the screen itself? That would be the first step to eliminate each part of the light path, and what I would do.
Hi PFC and thanks for the welcome! Yes, the screen was up against a sunny window and I saw no green smear.

Quote:
Originally Posted by PFC5 View Post
You said you cleaned the three CRT guns, but you didn't say HOW you cleaned it. Did you use just distilled water on a slightly damp cloth? Also how did you clean the mirror? Did you clean it with something besides Windex which can cause streaking?
I didn't use any kind of liquid cleaner; I simply gently wiped the guns and mirror down with the rag the eyeglass store gave me with my eyeglasses.

Quote:
Originally Posted by PFC5 View Post
Is the "smearing" covering the whole screen, or is it always in the same area on the screen that is less than the full screen? If it is not the full screen, then I would think it is somewhere in the light stream and if you cannot find it, you would either have to hire someone to clean it properly, or replace the set.
The smearing is in the exact same spot and never moves. It's about 5 inches long and looks almost like green Kool-Aid or green food coloring is on the screenfront. It looks like a paint smear that's right on the front of the screen, but obviously isn't.
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Old 09-21-2008, 03:19 AM   #4
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Quote:
Originally Posted by Brody View Post
Hi PFC and thanks for the welcome! Yes, the screen was up against a sunny window and I saw no green smear.


I didn't use any kind of liquid cleaner; I simply gently wiped the guns and mirror down with the rag the eyeglass store gave me with my eyeglasses.


The smearing is in the exact same spot and never moves. It's about 5 inches long and looks almost like green Kool-Aid or green food coloring is on the screenfront. It looks like a paint smear that's right on the front of the screen, but obviously isn't.
Try shining a flashlight into each of the guns and look for any anomaly in what you see. It sounds like one of the CRT guns is causing this so you might find out which one this way.

What about the mirro? How did you clean that? and did you try cleaning each thing a second time and see if the "smear shifts on the screen? That could tell you if it is something on the surface of an item in the light path that is causing the problem.

Hope this helps!
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Old 09-21-2008, 10:37 AM   #5
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Hi again PFC! Thanks again for the quick reply! I actully didn't use any liquid cleaner on the mirror either...just the eyeglass rag. I do know the smear stayed exactly in the same spot; both before and after I cleaned the guns and mirror. I didn't, however, shine a flashlight inside the guns.
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Old 09-21-2008, 04:51 PM   #6
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Try using that flashlight and look for ANY (even slight) anomaly in what you see. It could help figure out which gun might be causing the problem.

Good luck!
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All Klipsch RC-25(ctr),(2)SS1(surr),(2)SS1(rearSurr)
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For SACD/DVD-A Samsung HD-841
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Old 09-27-2008, 04:11 PM   #7
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Hey PFC! Well I have discovered beyond the shadow of a doubt that it is the red trigger gun. Although ill advised, I opened the screen with the TV still plugged in and looked into teh red gun. Aside from now being blind, I did see the EXACT streak inside the red gun that we've been seeing. I also noticed the TV flickers from a GREAT picture to a red tint every now and again.
I imagine this is a terribly expensive repair right? I did get this TV for free recently and only had to pay $245 for a mover to get it up to my apartment so I suppose if it's a couple hundred bucks I might just do it.
Any ideas?
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Old 09-28-2008, 03:48 AM   #8
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At least you now KNOW what the problem is. I would either call around to various repair shops to see what the prices are for the part and install, or try to get instructions for your brand/model display and see if you can do it yourself if you think you are up to the task.

Is it possible that cleaning the lens again could clean the smear off the red gun? You could always try that with distilled water on a micro-fiber cloth.

Good luck!
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Denon AVR-887
Klipsch RP-5 Pwred Towers (mains) (525 watts peak each 12"Subs)
All Klipsch RC-25(ctr),(2)SS1(surr),(2)SS1(rearSurr)
Toshiba (2)HD-A20,PS3,BD35
For SACD/DVD-A Samsung HD-841
Panny 50pz80u plasma
SETTINGS
RCA HD50LPW162 50"DLP w/HD2+
SA 3250HD
47" LCD+Yamaha5790+HD-A1(bedroom)
Harmony 680 + (2) 670s (amazing remote/support)
Game room with Onkyo receiver & B&W Speakers
The_Cable_Game
Take the high ground and be happier
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Old 09-28-2008, 08:38 AM   #9
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HI PFC,
Well the smear appears to be down inside the red gun when you look inside the top lens...it's not just on the top surface. I tinkered VERY gently to see if I could pop the lens off the top but it didn't give easily and I didn't want to risk breaking it completely. It's also VERY hard to find any reference to this TV online as I was hoping to find instructions on how to take apart the top lens so I could get in there and clean it.
I'm also concerned that it may not even be worth cleaning if the red gun is faulty anyway...as I said, the picture has a red tint to it that "flicks" from normal picture to red tint intermittently while watching. Is this also the red CRT gun going bad? I really don't know much about these things which is why I am hesitant to mess with it. I wouldn't even know what to look for to fix the flick problem...which I am more concerned about at this point than the smear.
I do see some king of screw that appears to be some kind of alignment screw as it has little ruler marks on it. If anyone knows what I should look for in terms of the "flicking", I'll take the TV apart again.
Thanks PFC!
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Old 09-28-2008, 01:44 PM   #10
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Here is a place that says they provide free service manuals if you feel adventurous:

http://www.eserviceinfo.com/fulltext.php

Good luck!
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Klipsch RP-5 Pwred Towers (mains) (525 watts peak each 12"Subs)
All Klipsch RC-25(ctr),(2)SS1(surr),(2)SS1(rearSurr)
Toshiba (2)HD-A20,PS3,BD35
For SACD/DVD-A Samsung HD-841
Panny 50pz80u plasma
SETTINGS
RCA HD50LPW162 50"DLP w/HD2+
SA 3250HD
47" LCD+Yamaha5790+HD-A1(bedroom)
Harmony 680 + (2) 670s (amazing remote/support)
Game room with Onkyo receiver & B&W Speakers
The_Cable_Game
Take the high ground and be happier
PSN: PFC5
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