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NotTaR of Television Sets : Vertical brightness or color bars
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1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying.
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These are typically more or less equally spaced possibly more evident at
the left side of the screen. They result only in brightness or color
variations, not deflection speed. Diagonal lines are straight and not
squiggly.
Note that the appearance of these bars differs from those caused by ringing
in the deflection circuits where diagonal lines will show a squiggling
stair-step appearance.
The most likely cause is a dried up electrolytic capacitor in the scan derived
power supply for the video or chroma circuits or video output. Check for this
ripple with a scope or test/replace any suspect capacitors.