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Picture reduces to horizontal line

The TV is an old Grundig CRT model. The picture suddenly reduces to a horizontal line that is fixed about midway down the screen. This can resolve after the TV is switched off and on again after a while. Why this problem? Is this due to heating ?

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Andrew Azariah what model is your TV? Is it a single horizontal line all across the screen?

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Isn't that called wide screen?

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