1. No customs duty if it is less than 25000 INR.
2. No price comparision will be done in airport if you provide them the receipt or bill.
3. Original bill is must.

almost all airlines do not charge any thing for 32" TV as its size is in acceptable limits.
37" and more are exceeding the size and most of the airlines are not accepting. Check with them before you travel with 37" or 42" tv.