In background color so pink red

How? You're seeing the best picture from your TV now. If you want much better than that, look outside on nature.
If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/

If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

For Windows 8 see...
http://www.eightforums.com/tutorials/5572-screen-resolution-set-displays-windows-8-a.html
For Windows 7 see...
http://windows.microsoft.com/en-US/windows-vista/Change-screen-resolution

Ye part hi fault hota hai bar bar

Visit this link. It has all details about how to enter the service mode to Sansui sets.

Type in this link address, [without brackets] either to Google Search Box or into the Address Bar to your browser and press Enter. It has all the details about how to enter into the service mode to many brand TVs, and how to adjust data values.

electronicshelponline(.)blogspot(.)com

In name [Electro-Help]

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dear,i also had suffer from it's service menu code. in some days ago i had been seeing a web site, their was had every service menu.then i got your sansui tv model.your sansui "ctvk2k21"model's in the IC no. is "tda9370ps/n3/a/1932" service menu is press "menu(from remote) & 0,3,2,3(from remote)".for more information call me for in any electronics gagged problem.

sansui k2k 21 tv service code

Hi,
Y sus problem with your TV. You need a basic tv knowledges to repair it yourselves. Regards

To or three likely possibilities, there is an open element in the green gun of the picture tube, or the emission is very low, the other possibility is a shorted video driver transistor on the video board.