My loverly toshiba crt has a problem, ive noticed that the tv CAN display a perfect black pcture but when i have a source input regardless where its coming thru, there is a slight white trace at the top and bottom of the left part of the screen, not very noticable but i know its there for example on the DAB channels using ntl those of you who have this will know that the picture is pure black with the radio text, this is where it shows ??
its not the scart, this also happend thru the tuner and component, thou when no source input is selected ie: and unused AV channel the screen is totaly black it looks great !
Sounds like a bad capcitor in the vertical drive or output circuit on your TV set. This will most likely get worse with time and the picture will probably collapse to a thin line across the middle of the TV set. Take the set into a repair depot becfore a minor repair turns into a major one. Good Luck and let us know if you had the TV set repaired.