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Hello, This indicates an Automatic Gain Control (AGC) problem often caused by a dried up capacitor. You will probably need a schematic to go much further. This could be a problem in the tuner, IF, or video amplifiers.
The following assumes you are sure the signal source is strong - try a VCR or other local one (channel 3/4, not the RCA jacks).
(From: Glenn Watkins (email@example.com).) Substitute a variable voltage source for the tuner's AGC voltage. Most of the time the range of AGC is from 1 to 7 volts. If you can get a decent snow free picture with an external AGC source, then the tuner is probably OK.
This is will require you to open the back cover of the television alongside an ohmmeter to read components on the printed circuit board of the television.. Take care
the transistor that controls the fan has shorted out and needs to be replaced, follow the wiring down from the fan to the pc board and trace the connection from the plug to the transistor, and replace,,,good to go, let me know how that worked
Unfortunately, without me seeing it I can't tell all what you will need to put it back into optimum performance. Older projection sets are pron-ed to having the coolant replaced for the 3 picture tubes. I don't know the quality of the tubes themselves, so it's really tough to make a call on your set. If it's just fluid, I would say you would invest $300.-400. in work. I don't believe it's worth putting that much into it if that's what it needs. Of coarse this is only if you have a projection set, you didn't state what model of set so I'm assuming it is one. Hope this helps......
id guess your set is like a 50v500 or 50v720 its a lcd rear projection
the blue cloud come from a warped lcd plate in the optic engine and would require replacment to correct this problem
if you have a extended warranty you would want to contact them
if not you might contact hitachi consumer affairs and ask them if there would be any assistance with this repair