Digital rebel / SLR photos are nearly all black

So???
Is the shutter opening? Put it on slow shutter speed and wide aperture say 1 sec at f4 or wider and look down the lens as you take photo. At some point you should see the sensor as the aperture is nearly fully open. If not then it isn't allowing light to get to the sensor, but if that's all working ok (and I assume you've looked at the photos on a computer and checked they are on the card and the exif info is sensible and they are still completely black) then you have a faulty sensor or processor. Remove battery reinsert and go into menu and reset the camera settings. Report back so???

Have you tried new batteries yet? Mirror lock up such as you have described commonly occurs when the batteries are dead.

If the affected photos were taken using a flash then you simply had the shutter speed set too high. The fastest shutter speed you may use when using flash is 1/90th of a second; with anything faster the second shutter curtain starts to travel across the film plane before the first one has fully crossed so only part of the negative is exposed.

If they were taken without flash then your camera has a faulty shutter assembly which must be replaced. It's not a DIY job, it's not cheap, and on a consumer grade 35mm SLR like any of the Rebel/EOS triple digit models it's usually not cost effective. Especially when there are millions of them lying unused and regularly available for next to nothing on auction websites and for absolutely nothing on FreeCycle/Freegle.

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You have light leak somewhere to the film.
Usually from the bad film door seal.

If you are getting some photos where only part of the image is visible, then I suspect that they were photos where you used a flash.

Cameras have a specified maximum shutter speed for use with a flash, this is called its 'sync speed'. This is the fastest speed that the camera will need to open the lead shutter and close the trailing shutter in order to expose the entire surface area of the image and have it evenly lit by the flash unit. If you shoot too fast of a speed, then the shutter will only be partly completed its exposure and you'll get a photo with only part of the image showing. The faster the speed past the sync speed, the less the resulting area of the image. Most cameras will have a sync speed of 1/250 or less. I think a lot of the Rebel models are 1/90 - consult your manual.

sir, this is CCD problum

The D70S is a SLR (single lens reflex). You cannot use the LCD for taking pictures like the small compact digital cameras. There is no way for the CCD sensor to have any image prior to taking since it is behind the mirror and the shutter is closed.

Lets see if the shutter curtains are opening properly : set to B and open the film back of the camera. Now release shutter and see if the first s. curtain has opened nicely and swiftly. Then release the second s. curtain and again see if you get proper closing of the curtain. If the shutter curtains ( usually just one misbehaves ) is slow to close then the shutter unit needs looking at . ( btw no point pouring liquids like benzine etc. into the shutter curtain are ... will make things worse ).