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I had similar symptoms about a year ago. Also came on sudden. The red convergence chip had burned out (poor heat sinking on this model Hitachi). Replacing the color convergence chips fixed it. ($50 for parts.) First, however, have you tried the "magic focus" function? That's explained in the manual, which is available online IIRC, but I'd have to look for the link if you need it.
The convergence output IC's have failed and need to be replaced. Sometimes when they go biasing resistors burn open also. These are large amplifiers mounted to heat sinks and have as many as 18 pins soldered into the circuit board. Better be handy at desoldering even if it's only the IC's that are bad.
This might also be called digital array. You might have to do the manual adjustment with the cross hairs on the screen. These, one red, one blue, one green, should all align on top of each other in a white color. If this does not work, you should call 1-800-448-2244 for assistance in finding a local service center.