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The Height adjustment is off... look in the back of the TV set, it has some knobs in the back, one should be vert.lin for Vertical Linearity adjustment, and there is another call Vert.Hgt. for Vertical Height adjustment. try adjusting the Vertical Height first with someone watching in the front of the big TV to see if the top comes back into view, you might have to adjust the knob very slowly one way then the other way, to make this adjustment. If it doesnot adjust take it to a TV shop to get it repaired.
Its not a problem you can easily fix. Many Mits TVs of the mid-90's had a PIP board in them that had dried up surface mount capacitors on them. The board would have to be either re-built or replaced at a considerable cost.
Do not try to adjust anything yet!! Adjustments do not get out of alighnment all of a suddenly. The convergence adjustments are there to do minor aging alighnments. I would first check for bad solder connections on the convergence IC's first.
The P52940 uses the 195 series chassis. The vert/hgt control is for vertical height. It adjusts the size of the picture from top to bottom. If your picture is flipping, it most likely means that something is wrong in the vertical circuits. I have seen fluid leak out of one of the CRTs and drip down on the vertical output IC, causeing the picture to go crazy vertically. The set should be serviced by a qualified tech experienced in the RCA 195 chassis.
When you say horizontally, do you mean it collapse or it scrambles. Because the 2 are different problems. If you pictures shrinks or collapse then it is in the vertical circuit. and if it scrambles itself almost like you can see the picture but it is broken up over and over again, then this is video problems in video circuit. Need more info
Yes you are correct, no days these TV sets have an automatic vertical hoild, and no I am sorry to say, there is no adjustment for you to make. there is a problem in the PIcture in picture circuit if there is one or the sync sepaqrator circuit has a problem. most likely a bad capacitor or a bad diode. This is a solid state set and there are no user replaceable parts inside them unless you know how the circuits work and can trouble shoot printed circuit boards. You are best to call in a pro to assist you in this repair. Good Luck