This is a common problem with older JVC set. You have a solder joint that is loose or broken. You might try resoldering the wires from the Vertical Amplifier (big heat sink), on the yoke, and any large wires leading to the main board. My set was doing the same thing. I went in and resoldered anything that looked suspect and the set it working fine. DO NOT let the set operate long with just the horizonal line or you could blow the main output transistors.

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