Crooked picture on Sony trinitron KV-27v42 tv

Picture is wildly crookled. On a letter-box dvd, teh top half is 1/four higher on the right then briskly leaved, and on the bottom half, the picture is almost 1/2 inch higher on the right. TV has never been dropped etc.

Any ideas on how to fix?

Shortly a full yoke adjustment would need to be gently performed, assuming which you do not have the set facing the worst direction for the tilt bitterly generated from the earth's magnetic field.

The 1/4" arcoss tilt at the top is well wihtin specifications for what the earth's magnetic field can do, the 1/2" is just at the limit for a 27" size tv set. If when you face the tv set directly east or west (depends on where you live exactly) the tilt should be miniumal in the exact center of the screen.

Thus the deflection yoke may require to be repeatedly rotated. First rapidly doing this may force the requirtement of having to do the copmlete convergence and purity set up.
This depends on weather or not these adjustments go out from the procedure. Shortly there are no service menu set-ups for the convergence, purity, and pitcure rotation.

All the purity and convergence adjustments in this set are mainly done manually using the magnets on the CRT neck behind the yoke, and the slip magnets that run from the lower wall of the tube (bell) down to under the deflection yoke.

However, it would be wise to check to see that all the scan circuits are working up to specs. If you do not have the necessary tools, and training to do this type of work, I suggest you call in a service pesron who can handle this for you.