How to change the aspect ratio?

[vlinus]

My TV is Onida 32 inch LCD.It has 3 aspect ratios.am using sun dth.None of the aspect ratios is correct.In one aspect ratio,i get the correct picture but it wont utilize the full screen space.Other aspect ratios uses the full screen space but the picute size varies.Can I change the aspect ratio of the SUN dth incoming signals to match to suit the TV screen .

 

[TeluguGuy]

Try calling up the CSE and seek their help.