most tv manufacturers have local repair people to come to your home to fix them . I know Panasonic and pioneer do
thats if you want a warranty repair
if the shop stuffs up and the courier damages it in transit or whatever, you've got the hassle of waiting for couriers etc...
Some dont mind this (myself included) but others do. Theres no doubting that good old high street shopping is the most convenient, especially with expensive electricals.