Television only has one working line across the screen

When CRT TV's show only a white/bright line horizonatlly It is a failure of the flyback Transformer. Not all that costly to repair. Your old TV will probably still be working when all the latest plasmas and rear projections have been laid to rest. Fancy junk TV's dont get any better programs than those old reliable ones

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It is a calibration problem, let me see if I can find some schematics for your tv.

sounds like a vertical problem, usually you'll see one white line across the screen, but one I worked on would come on and the bottom half of the picture was gone and there were lines across the top of the screen.

If you know how to solder & can find the vertical output chip then you could try resoldering the pins. If this doesn't fix it then it needs new parts.

The vertical output ic needs re-soldered, look for a 5 pin ic connected to a heat sink near the flyback, re-solder the pins. If you are not up to this a local shop should be able to do this and it should not be an expensive tv repair.

The problelm is a defective vertical deflection system. Could be the amplifier, vertical output driver or whole printed board that supports the vertical deflection activity. It is considered to be a serious failure.
The cost of repair will be around $200 to $300.

if the lines go all across the screen and they are like one or two pixel wide,
that is a symptom of a bad lcd panel

it's an lcd filter fault it's betwine lamp and screen before mirror, seems like u will need to replace it but it hard to say without look at it.

if this line is in the picture, that is possible burn in screen. if you have a black bar at the top or faint white lines that come down from top this is caused by defective filters in vertical circuit or bad vertical output. mch

I did not fix the problem, but you have the model number wrong, it is KP-46WT510

I do need some help.

Hi. this is caused by dry solder joints on the frame o/p IC. Resolder all legs of frame chip. Should sort that out.