Answer: Dear You may want to get him out of this habit quickly as it is quite addictive and you would be aware of all the repercussions of eating in front of tv !
1) For a good cause, lying is not bad. So, initially, say that TV is not working or that there is no power and then try to feed him with the following methods. But dont get frustrated if he eats less than what he eats if he is in front of TV - slowly the amount will increase and it is a worthwhile sacrifice to get him out of the habit. Importantly, Tell yourself / convince yourself that TV is not an available option for you or for the kid at all !
) Nothing like our traditional way of feeding - show moon in the night and tell a story (the more outrageous and unbelievable it is, the quicker the food goes in!); in daytime, keep him in a place where he can see outside world - birds, trees, dogs, people going about, engage in conversation or tell a story and feed him. Could be balcony.
Give him small rewards for eating on time and without watching tv - reward could be the time to watch tv after he finishes eating. Or the star system, after he is little big - basically, give him a big sheet, ask him to give himself a star whenever he finishes eating and end of a week/month, count the stars and buy a gift. But there is a subtle difference between bribing and rewards - you need to be careful of that boundary.