Asteroids wild northern lights halo?!?

have only seen problems like this twice. one was the monitor is improperly adjusted the other is that the transistor for the gain of the z axis had drifted out of spec.

on the game board
 
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- Try turning the brightness down on the deflection board. You may also need to adjust the contrast to compensate.

- If you still see the retrace lines even with the brightness turned down, it's a problem with the Z axis signal, which could be on the deflection board, or the game board.

If the monitor has never had a proper rebuild, it will need one. So that would be the next thing to do. (Cap kit, and reflow all header solder joints to start, then see where you're at.)
 
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