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Yep, the video circuit is where I checked. When I cranked up the sub brightness control and looked at the picture more closely, I noticed that the picture is not very sharp and there are black streaks, especially when writing is present.
I suddenly remembered an '80's 19" "PC" chassis GE doing that and it was a small value electrolytic in the 200V line to the video output stages. I've already checked the electrolytic in the 200V line in the Toshiba and it is good. I'm going to check the rest of the electrolytics in the power supply. Maybe I'll get lucky.
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