Here are some of the LCD TV options available for you at price range of Rs. 20000.
Philips 26PFL4306 26 Inches LCD TV Under budget of 20K this TV seems to be good fit for the screen size and the feature set. It has HDMI and USB port (2 each) and ability to recognize lot of file formats that you can play on the TV. Mounting is currently desk only. Though this is not a smart TV, it definitely has a good set of features. As far as the pricing goes it is costed at - 17,625 Rs. You may find the TV model on the Snapdeal or in philips retail store or croma.
Price : 17,625 Rs
LG 42 HD LCD TV - 42LN5400: This model from LG is full HD compliant. It has 42 inch of screen size. It has HDMI and USB port (2 each) to the TV. TV allows wall mount and desk mount. It has around 8 different aspect ratio screen size for your TV. You can find the TV on shopclues for the price of 19,379 Rs. You may also find the price lower in croma and the LG retail service.
Price 19,379 Rs.
Toshiba 32 inch 32PB2E HD LCD This model from Toshiba has 32 inch display screen with 1366 x 768 Pixels resolution. You may get HDMI and USB port (1 each) on the model. It has only desk mount option. In term of warranty it offers 3 years onsite warranty for both retail and online purchase. The TV is priced at Rs. 19,936. You can find the TV available on kaunsa.com with this price.
Price: Rs. 19,936
Haier L32M3A : This model from Haier has 32 inch display with full HD 1920 x 1080 Pixels resolution. It has support for both HDMI and USB port. It is full HD compliant. In case of audio, it has 5 side surround sound system. It has both wall and desk mount option. The TV can be purchased online on Amazon India at the price of 15,300 Rs. TV is good with warranty front as well as it has 2 year warranty.
Price : 15,300 Rs.
Hyundai (32) LCD HY3240HHNThough hyundai doesn't have many good models under this budget. But this model from the hyundai has 32 inch screen. It has HDMI and USB port (1 each). It has 2 year warranty. You can find the product on snapdeal at the price of 15,900 Rs. TV also has the wall and desk mount option. This is not a smart TV but you are getting almost every feature same as LED TV minus the screencasting and other smartTV features.
Price : 15,900 Rs.
A smart TV would be preferable. Smart TV in LCD for this price range are not available from known brands. You may have some other brands like mitashi and Haier for smart TV under 20k but with LED displays. If you prefer established brands such as LG, Samsung, Sansui then you may want to go for the LED Smart TVs over 40K budget.