Have you install graphics driver ?
model KDL-32L4000
When I use the normal setting I do not see this. I have vertical lines of various widths. This started on the left about a year ago. It has gradually grown wider. It is the edge of the normal setting. I now see it on the right.
On one channel I cannot get the full normal. I have a 2 in. band at top and bottom. Cannot full screen either with this channel. This started yesterday.

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