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Spent few more dollars on LN5700. You will not regret it.
on April 18, 2013
This TV would be a solid value if there were no LN5700:
(1) IPS screen, which provides great color saturation and viewing angles (but sacrifices some black level).
(2) Direct-lit screen, which eliminates backlight bleeds that are a common problem for edge-lit TVs.
But given that the LN5700 is only 4-5% more expensive, the 5400 is a poor value. I returned my 50LN5400 and bought a 55LN5700, and could not be happier:
(1) LN5700 has no uneven backlighting. LN5400 has slightly uneven backlights. On an all-white screen, you can see dark patches.
(2) LN5700 has a much faster processor; LG says the CPU is 120% faster and the GPU is 300% faster. 5400 has an old processor from 2011-2012. Picture quality seems better on 5700. My TV is hooked up to my HTPC. 5400 had difficulties rendering the sharpness of texts. Texts either looked too edgy or too blurry. But they look fantastic on 5700. 5400 has a very different menu. I think it must have an old operating system, because the new OS probably cannot run on an old processor.
(3) LN5700 has wifi and can update firmware, LN5400 cannot. In some cases, updated firmware brings massive performance increases. I had a Panasonic DT50 before. The colors were off a lot, but after a firmware update the colors looked great.
I suspect that 5400 is a 2012/2011 model rebadged as a 2013 model. Given the tiny price difference between 5400 and 5700, there is absolutely no reason to buy a 5400, but I highly, highly recommend 5700.