Yes you are right , the fault is a failure of the verrtical output. Now this can be related to a failure of the sync pulses, the vertical drive to the outputs. If you have a scope you can trace to confirm as this circuit is not available. Ideally the other way is to replace or even with the set switched on - with care- use the right value capacitors in parallel on the vertical side and the fault will clear if there is one faulty. Otherwise it can also be a fault in the vertical driver or the deflection coil, check solder joints on the output.
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This is more like a vertical foldover. I get a single thin line in the middle of the screen from side to side. Audio is fine. Has this issue with another tv some years ago and it was a capacitor. Problem here is I dont have the schematics for this TV so if someone has an idea which caps to check that would be great. Thank you
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