Screen has 3 black horyzontal lunes

Sounds like you pulled the TV apart, good luck. Hope you earthed yourself. You could try a replacement t-con board. if that was the problem. http://electronicshelponline.blogspot.com.au/2012/06/how-to-replace-faulty-tcon-board.html

Hello Sashaone,

The F3 has the most extensive selection of focus screens ever made for a Nikon camera - 22 in all. The "L" and "P" will give you the diagonal split image rangefinder that you love. The difference is that the L has a groundglass/Fresnel lens field around the split prisms. The P has a microprism collar and an inscribed horizontal and vertical line forming a large cross.
You should also be aware that with slow lenses with maximum apertures of f/5.6 or so, these prisms tend to black out. Here, Nikon has solutions too, including the R screen, which has gentler slopes on the prisms to combat blacking out with small maximum aperture lenses. The R also has grids to help with composition, similar to the E. Then there are the all matte, all microprism, aerial image screens (C, M) too.
Personally, I have the C E K M R screens, in alphabetical order.
Some subset of these screens are available for the other Nikon F series cameras (F, F2, F3, F4, F5, F6), as well as the FM2, FE2, FM3a line, which can also interchange screens.

Thanks.

The line is there because the vertical deflection unit - the one that spreads that line across the entire screen to form the image - has failed. Replacing it is a job for a professional, or at least an experienced amateur, and the parts will be quite difficult to find for such an old tv . 

yes this could be the start of bad picture tubes . but you can adjust g2 controls and get rid of the line

look for a button on the remote cont marked n/p or np and press it hope that solves your problem

try your monitor to other computer or try other monitor to your computer to see where is the problem

This sounds like it might be a defective CCD imager. If so, Canon should fix this for you for free, including free shipping both ways. This is regardless of your camera's warranty status. Please check the following two links for more info:

http://camerarepair.blogspot.com/2007/11/canon-digital-cameras-showing-black.html

http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&fcategoryid=225&modelid=13390&keycode=2112&id=29819

Applicable cameras include:
A40, A60, A70, A75, A80, A85, A95, A300, A310, S1 IS, S60, S200, S230, S330, S400, S410, S500, SD100, SD110, IXUS V2/300/400/430/500, IXY Digital 200a/300a/400/450/500

Dead CCD

There are no adjustments for this problem,if the unit has been working good for 3 years and suddenly gives you this pix is time to call a qualified technician,among many reasons you might have loose solder conections in the horizontal drive circuit or poor regulation problem in the power supply,if you dont know how and where be safe and call a Technician.

There are two display modes newly added for the DiMAGE 7i, grid and scale. The grid mode is to show a grid over the entire screen. This makes it easy to align the camera to objects vertically or horizontally. In the scale display mode, horizontal and vertical lines cross at the image center to divide the view to four sections, and each axis is scaled. This function is useful for close-up photography. The grid or scale on display is not recorded.