Picture shringking 2 side horizontaly sony tv

SOURCE: vertical/horizontal

Since you can bang it to heal it some, try checking for cold solder joints. Caps and IC's next. Careful TV's store up to 3000 K volts unplugged. Enuff to kill.

SOURCE: tv picture shrinks to one small line across the middle the screen.

resolder vertical output ic pins

SOURCE: Ct-36g23

In older CRT televisions the horizontal power supply can start to degrade causing the picture to shrink.
Take it to a qualified repair man to have him replace the particular components that are starting to die. This repair will require identifying the particular component and replacing it. 
Often times just finding the bad component can take hours of troubleshooting by a skilled technician.
Tho, before you take it in try ruling out one simple issue like bad mains voltage. Try plugging it into a different outlet in a different part of the house.

SOURCE: Picture on RCA TV shrinks to a horizontal line

Hello,
Sounds to me you have a cold solder joint ( loose solder connection ) on the printer circuit board around or on the vertical chip or on one of the vertical capacitors. You may also have a bad vertical chip or a bad vertical capacitor, but I doubt it since it did come and go. I'de get a soldering iron and some solder and touch up the connections. I will remind you that you need to always excersise saftey by making sure, before removing the back, unplug the TV from the wall, and use care not to come in contact with the large red wire going to the back of the picture tube as the picture tube can be turned off and still store lots of voltage ( up to 35,000 volts). Always stay safe and when soldering, use care not to run solder across places that will make a short.
Good Luck and I hope this helps
Ed Meshechek ( Radio Man )
NC Electronics
Mills, Wyoming
307-266-4675

SOURCE: Shrinking Picture

problem is bad soldier on the vertical IC , this part needs to be resoldier to solve your problem, its a simple job for any tv repairman.