Read somewhere saying that this is not burn in but called pixel persistence. Burn in only applies to those phosphorus based tv like plasma. Usually it will go away after a while if the pixels are not stucked or dead. Try to watch it in 16:9 format for a while to see whether it will disappear

Maybe not that ppl don't believe it but hardly see a case like this.

Not sure is there anyone else who also watch it in 4:3 for long period of time have the same issue before ? Good to share for everyone's knowledge on this.

It doesn't make sense to me also to have light source based TV to have burn in. Has the problem gone away eventually or it has become permanent dead in pixel transition ?

Maybe they were using the cheapest LCD TV they can get for cost saving like those in restaurants and other public places then this might be possible caused by the low quality of panel used like what lightning69 said, it's a panel fault.

Do you switch Astro channel every 5 minutes to avoid the channel logo being static there for too long ?

I think most of the cases mentioned here are in extreme condition displaying a static image for a very long hours everyday. For the normal home users, who will watch tv 24 x 7 till lcd die off, so it's all different story comparing those lcd tv being used commercially with those used at home. I've had 3 lcd tv before including the current one and never experience at once so called the "burn in" where most of the time watching Astro channels whith their static logos at the top right corner for hours