A single horizontal line that usually travels up the screen slowly. Key is, there is only 1 line at a time on the screen.
This is typically caused by 60 cycle ripple from an A.C. line 1/2 wave power supply. Usually on a low voltage power supply used for a stand by source on an inexpensive or older television receiver, and in some models used as a band switching voltage on some vintage television receivers.
The offending ripple doesn't exactly match the phase of the 60 Hz vertical rate. This is the reason we see the horizontal bar or line up or sometimes down the screen.
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