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The problem may be related to bad capacitors on the PIP module. This is a commom fault as vertical sync runs through the PIP board and this is the symptom of the pip board having bad capacitors the TV rolls.
Rolling picture could be a pip module problem as both horizontal and vertical sync goes through the PIP module. These sets have been known to have bad caps in the pip board causeing loss of vertical sync.If you need any more info let me know.
Try hard reset first==Unplug ac cord overnight,
then try again.Possible signal board trouble--
Practice visual acuity technique==look for CRT
coolant leak on circuit board.
Also suspect PIP PCB==can be by-passed by a knowledgible tech.
There are two common problems with this set that cause the symptoms you described.
Both of them are caused by capacitors:
CHECK C2P05 100 UFD 16 V OFF PIN 3 OF IC2P01.
CHECK C2P08 100 UFD 16 V OFF PIN 3 OF IC2P03.
They are located on the signal PCB. Both capacitors are inexpensive and will more than likely solve your problem.
Hope this helps.
The Main Picture will eventually go out or at least become distorted. Generally the PIP circuit can be repaired by replacing a couple of capacitors. Probably a job for a Pro but it will need to be done at some point.
Does you set have PIP (picture in picture)?
If it does then the PIP module has a bunch of capacitors that have gone bad (dried out and leaked) causing you to loose vertical sync.
Vertical synchronization is what locks your picture keeping it from rolling.
Even if you don't have PIP then still you have a vertical sync problem.
The set would have to be checked by a tech to find exactly what's happening.