(Both) larger LCD and LED TVs are constructed to have their weight balanced when set upright. So if you lay the screen flat, there won't be adequate support in the middle, which can lead to cracking or distortion on the edges if left that way over time.

Is it OK to lay a flat screen TV on its back?

You aren't going to damage the internal workings of your flat screen TV by laying it flat. ... That being said, even though laying your TV down flat won't cause internal damage, it could be a recipe for external damage. There's a complex balancing act going on in the way that flat screen TVs are constructed.

How do you transport a flat screen TV?

Keep the TV upright. Once the TV is wrapped, slide it into the box vertically. If you have a large-screen TV, have someone help you. Always keep a flat-panel TV in the upright position during moving or storage to avoid pressure on the lightweight glass that could cause permanent damage.