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it sounds like the display may have finally gone out, however i would recommend to check other inputs (AV1, AV2, etc) by connecting a dvd player or game console. it may just be the one input that you have your cable box or coax cable connected to, so testing the other inputs will help determine this. if you get the situation with all inputs, no video but sound works, then you will either need to have your tv repaired or replaced.
there is only 1 hope for you on this one, intermittent color is a touf one, tap on the board with wooden or plastic handel see if you can make the color come and go that way, if so you have a intermittent break in the board, my guess is by one of the big ic chips on the board. if not able to make the problem act up with the taping then you have to look at the croma section and color oscillator section , this is not easy needs skiz and a scope and a little know how. depending on what they need for time a shop would charge 100-210 to fix this kind of problem. sorry this is not what you wanted to hear but is one of the tufer problem to fix on a tv.