Originally Posted by beelbeel
I have a similar issue. If you have an image that is mostly light and there is one dark element, there can sometimes be a bar of darkness that extends from that object to the top and bottom of the screen. Similarly, if you have a colored screen (black doesn't actually do it the most, other colors do) and white text pops up, the portion of the screen that has that white text will be brighter from top to bottom.
The most noticeable way to see this effect is if you pull up the menu and the whole screen gets brighter. I'm going to call LG about it soon, because it is too late to return my tv to HH Gregg.
Originally Posted by AV-Freak
That's absolutely normal for local dimming with an edge Led tv.
The dimming zones in this year models are vertical so you get this effect from top to bottom.
Yes, it is normal to observe a bar (halo effect) of light extending from bottom to top. HOWEVER, as past owner of a 47LM8600 and current owner of two 55LM7600 sets, I would like to add my own experience.
Had a 47LM8600 for almost two weeks and it had this halo effect present, more than I would consider normal. It was really really noticeable even during daylight conditions. It annoyed me to the point to return the TV. Luckily, I got the set through Amazon and return was not an issue. I have read similar post from LM8600 owners experiencing this issue.http://www.avsforum.com/t/1410096/official-lg-47lm8600-55lm8600-owners-thread/240
It seems this series (LM8600), or at least a batch of this series was defective. Back then, I did not find any LM7600 owner reporting similar issues, so I gave it a try and got one LM7600 and fortunately this model does not have it, or at least the TV set I got. Well it does have it but nothing like the LM8600
. I honestly think I noticed it just because I was looking for it, because of my previous experience with the LM8600. It seems to me that there might be a batch of LM8600 or even LM7600 set with this issue but not all of them, not at least with this intensity.