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How to Replace CRT coolant
in Rear Projection TVs
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How to diagnose bad CRT Coolant:
Note: This problem will only affect the GREEN and BLUE picture tubes.
The RED CRT is never affected, because the wavelength of the red
light does not promote this algae growth
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General Symptoms: Washed out, blurry picture, red portions mostly OK, GREEN images have halos, BLUE portions of images may have halos or be missing entirely.
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1. Switch to a known good signal (go to a video input and use
your DVD if you have a snowy condition from your antenna.)
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2. Turn the color level control all of the way down and remove the screen
and/or the cabinet that contains the mirror. (different for different models)
Do not turn the set off or the color level control will reset to preset levels.
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3. Look directly into the picture tube lens while the set is on.
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3a. First look at the RED CRT. Observe the scan lines in the picture.
These same lines should also be present in the green and blue picture tubes.
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3b. After looking at the RED CRT for comparison, look into the GREEN
or BLUE CRTs. If it is contaminated, it will look like there is a layer of film
that you have to look thru to see the picture. There may also be swirls and other various
contaminates forming. If it is not as clear and sharp as the RED CRT, it is
contaminated, and you should change the coolant fluid.
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After diagnosing, reassemble everything so that you can again see the picture.
DO NOT MAKE ANY INTERNAL ADJUSTMENTS TO THE TV AFTER THIS POINT.
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and its affiliates are not responsible for damage to your equipment, ego, blown parts, county wide power outages, planetary disruptions, or personal
injury that may result from the information provided here.
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