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When you have two vertical half frames, it means that the vertical oscillator is running at twice the correct frequency. Sometimes all you have to do is adjust the vertical hold control differently. If there isn't enough range in the vertical hold control to bring it to the correct frequency, check resistors and capacitors in the vertical oscillator stage. Make sure all resistance values are on target, and the capacitors match the values in the schematic.
Your picture looks a little strange. You might be running at 1.5X the correct frequency, which should not lock all that well.
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