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IM GUESSING ITS A LAPTOP SCREEN OR COMPUTER IT COULD BE SOME WATER TRAPPED INSIDE OF THE SCREEN LIKE CONDENSATION WHICH COULD MAKE A PRISM OF LIGHT LIKE WHEN YOU SEE A RAINBOW BECAUSE ITS SUNNY AND RAINING
verify that the P/N switch is set to the color system of your country. N (NTSC) for US and P for most of Euroope and Australia;
depending on how "old" the TV, the Screen Resolution of the Toshiba may have to be brought down to the lowest possible setting;
additionally, the Screen Refresh Rate may likewise need to be lowered say 60 Hz;
all of the connections you mentioned are video connections. However, only 1 should be used. You may have to experiment (again depending on the TV) which setting & connection would give you the best picture;
offhand, the component connection (if applicable, the red/green/blue cable) would give the best connection followed by S-Video and last would be yellow (composite).
Your screen may need degaussing. The symptoms are colored blotches, usually around the edges of the screen. This is caused by magnetism in the screen itself . If this is the case a repair person can use a tool called a degaussing wand to remove the magnetism and fix the picture. Some TVs have the ability to do this themselves, it depends on the brand and model
replace the lamps and then run the synch routine from the main menu. unfortunitly with the expense of the lamps and the low price to replace projection tvs it might not be worthwhile to fix but just replace.
HINT wait till after new years, LCD large screen tv sold about 35% of what was expected during xmas so they will be real real cheap after the 1st of the year