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Are you connected to cable TV or an outdoor antenna? If on cable TV check the signal on another TV or if on an outdoor antenna you will need a digital TV adaptor to pick up local stations due to them not being available in analog anymore. Please take moment to rate my answer. Thanks...
If the shrinkage is just the top & bottom then it is relatively easy/low cost fix. Most probably, a capacitor in the vertical section is nearing end of its life. This would be the biggest of the bunch and would be something like 47uF/50V.
If however, the shrinkage is on all four sides, then it is the master power supply that is at fault. Chances are the main B+ is getting low which cold be caused by the big filter capacitor or an erratic regulator. This is not a simple fix and would require the services of a qualified professional.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
If you remove the back of the TV (be very careful of the flyback transformer as it can kill you! its the little lead that goes straight to the back of the tube) and look at the old connector. It is called an F81 barrel connector and the old one is probably just soldered in, you can get another one at radio shack or flag down a CATV guy and just ask him for one and solder it in inplace of the old one. Or just use the RCA inputs.
Sounds like DRY JOINTS WITHIN DFS MODULE.
This is a pcb within a rectangular metal screened box on the left hand side of set when looking from the front.
Will need resoldering be carefull very fine print will need decent soldering iron with fine tip & poss magnyfying lamp to aid looking.
If your not at all sure take to repair shop.
This TV is nice set has one of the best crt pictures you can get.