First of all as long as I experienced Krissserz, these big brands such as LG and others, they don't ever bother to respond to individual customers. And may be replacing your LG5800's LED will fix the issue. But you may hear such discussions on over the internet and may be from your fellows, that the LG's products in 2014, are not of the same quality as they used to be.
I've been trying to email LG for WEEKS, now, and their online email form doesn't work! Their chat service either!
Anyway... My LG5800 auto dims every time the screen goes from a dark to a bright (or a bright to a dark) image, making dark scenes way too dark to see anything. Seriously, I can't watch movies!
According to my online researches, it is impossible to switch off, because it has nothing to do with the energy saving mode; apparently, this "feature" is hardwired into the firmware.
This problem has been reported since 2010. Here are just a few examples:
• http://www.rtings.com/reviews/tv/lcd-led/lg/lb5800 (Third question.)
• http://www.amazon.ca/LG-Electronics-47LB5800-47-Inch-1080p/dp/B00II6VT12 (Comment by Tuan Bui.)
• https://www.youtube.com/watch?v=zg8Xe98d8Fo (First comment.)
Do you think LG will fix this soon?
Thanks for everything.