A:AnswerThere's a few differences. Mainly the H5203 has a 60mhz refresh rate (update frequency) and the H6203 has a 120mhz refresh rate.
With that, comes a slightly higher power consumption on the H6203's behalf ( 77Kw/year vs 73kw/year).
The H6203 also weighs about 2lbs less.
A:AnswerThe TV has HDMI outputs so it shouldn't be a problem to view pictures from you laptop or phone. It is also a wireless tv, meaning it connects to your wireless internet connection so it's easy to sync the TV with other devices in the house.
A:AnswerI have not had this problem. The're may be an issue with your stand. I would recommend that you contact the seller and have them replace it for you.