Green drive and green cut.
 

Hi.

Could someone tell me please what the difference is between green drive and green cut? Both can be adjusted separately via the service menu on the flat screen Toshiba CRT TV I've got. Blue cut and blue drive are also adjustable separately but as far as I can find, the only adjustment for red is red cut.

Having made a complete balls up of the picture geometry (never drink cider then think you can improve things), next evening I managed to work my way through it and got it back to normal (more or less). At its worst, the red tinted dial of Big Ben shown in the opening sequence of "The day the earth caught fire" looked as if it had been painted by Salvador Dali. Seriously.........

The "cut" is similar to brightness in a B&W set, and "drive" is similar to contrast.

Yep -cut affects the blacks, and drive affects the whites. Getting the blacks to be black and untinted by adjusting cut is most important.

On the 19" I'm repairing the flyback on, it has BIAS on the back. What are those for? They seem to be similar to cut.

Thanks for all your help; just maybe I can give a bit back.

An odd bit of information that's stuck in my mind since the 1970's. I think the effect of BIAS is similar to TINT and only works with NTSC, or as sometimes happened in the 1970's, cheap NTSC imports brought into the UK and modified to work with PAL.http://audiokarma.org/forums/images/editor/color.gif

old_tv_nut
Quote:
Originally Posted by wa2ise View Post
The "cut" is similar to brightness in a B&W set, and "drive" is similar to contrast.
Yep -cut affects the blacks, and drive affects the whites. Getting the blacks to be black and untinted by adjusting cut is most important.

Yes. When I bought the set (32" flatscreen CRT, for the equivalent of $35 I don't think I was robbed) it had a great picture on highly lit scenes but anything black showed up with a reddish tint. Taking red cut to absolute minimum has fixed it, but the man who told me how to do this also warned me that an adjustment that extreme indicated that the tube might be on its way out.

Strange how it comes back to you.
 

I remember back in the 1970s a friend telling me that one way to check if a colour TV was set up properly was check how well it could handle a black and white picture.