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You might have blown an in line fuse. It would be right where the power cord hooks up to the TV. If that's the case and you replace it and it blows again call the repairman. Real good chance it just blew though. Good luck.
Turn down your color and see if the screen has a normal black & white screen. If it doesn't then the CRT is bad (picture tube). If it is black & White then you have a either lost your red or blue.That problem will be in your video driver circuit of which a service center can handle.
if your tv has a warranty take it back to where you you bought it.or check if your remote has the zoom feature,if it does zoom it back.or else you will have to call the repair man to program it for you.
The circuit board is probably broken. OR maybe also the picture tube.
If service shops in your area give free estimates, it might be ok to have someone checkit for you. Newer tv's however can be replaced cheaper than repaired unless they cost several hundred dollars.
The smaller size of the circuit boards make it very difficult to repair them.