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Philips has had a big problem with there coolant fluid becoming cloudy. The only way to clear it up is to have the fluid changed. With every projection crt tv there is a layer of cooling fluid between the face of the crt and the lens. This coolant cools the face of the crt. Over time the coolant breaks down and the light coming through gets distorted. The crt's have to be removed from the set to do this.
Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.
If decide to do yourself, ya only have to do the green and blue ones, the red light spectrum won't allow fungal growth. Pull whole CRT assembly out to prevent spilled/leaking glycol from onto lower main boards
Isolate filament voltage from CRT,i.e. unplug
Crt socket from pix tube.Measure filament voltage on CRT PCB.If present,suspect bad pix tube.If missing,solder any/all connects in
filament circuit,meaning CRT board first then