I recently purchased the 55 inch LM7600 and I'm satisfied with most everything about it except for one issue that has been bothering me since I brought it home, which like for many on here has been the flashlighting from the corners. I think after playing with it I found a fix but would like your input.
First, I must say that this is the first flat panel and really big tv that i've owned, I did a lot of research and the TV got a lot of positive reviews with a few negative ones, most of which mentioned this problem. I thought, it's such a small percentage, it couldn't be that big an issue. Also it was cheaper on Amazon (at the time) than the Samsung 55ES7100 I was also looking at. I picked it up from Best Buy as they are matching Amazon's pricing in order to stem the tide of all the business they are losing to Amazon. I set the TV up myself which was fairly easy for such a large unit but then had to go out of town for a few days before I was able to really sit down and play with it.
After coming back I used the calibration settings recommended by this review. http://www.flatpanelshd.com/review.php?subaction=showfull&id=1333359799
Picture preset: Expert1
V/H Sharpness: 50
Dynamic Contrast Off
Super Resolution Off
Colour Gamut Standard
Edge enhancer Off
Color Filter Off
Noise reduction Off
Mpeg noise reduction Off
Black level Low
LED local dimming Off
Color temperature Warm
RGB Method 2 point
R high -6
G high -11
B high 18
R low -1
G low -2
B low 4
The picture was great, that is until the lights were off at night and the flashlighting was noticeable from all four corners in dark scenes. I though it was just me, but couldn't bring myself to not be distracted by it. I did more research and found that this was a common problem amongst all edge lit LED's, but still felt this was unacceptable. I ended up calling BB and they scheduled a technician to come out who said that unfortunately the TV was within spec and recommended possibly switching to a plasma. I have my reasons for not choosing plasma, and am still very reluctant. He told me to try reducing the backlighting and contrast lower to like 25 and 50 respectively, but this made the screen look very dim and while reduced I still noticed the lighter corners. I also turned the LED local dimming on to low. I am still within 30 days and he told me that if I was still bothered by it that I could exchange it but otherwise there was nothing to do.
After he left I played with it a little more and the one thing that stuck out in my mind is that every time I turned my PS3 off the no signal screen appeared and the problem virtually went away as the screen was markedly brighter. So I decided to try lowering the backlighting to 25-35 and the brightness anywhere between 65 to 75 while keeping the contrast at 85. I also turned the local dimming up to high and as if by magic the problem was virtually eliminated. I still notice some uniformity issues at the very edges but they are slight in comparison. I currently have my backlight at 25 and my brightness at 75 and local dimming on high with all of the other settings as shown above and to me, in my fairly dark living room, the picture looks great, with minmal uniformity issues which at this point i may only be noticing because I am OCD about it.
The only concerns I'm having are that I may be deluding myself as to the quality of the picture with these settings, the blacks seem satisfactory to me, and my girlfriend said its a vast improvement, and that because the brightness is higher I am also concerned that I may be consuming a significant amount more power and also reducing the lifespan of the TV. I'm also worried that this might put more strain on the eyes, though I watched Into the Wild, which is a 3 hour long movie, after changing the settings and felt fine.
Does this solve the problem? Has anyone else tried this? I'd love to hear your thoughts on this.
EDIT: I've added a couple of photos that show the difference between the recommended callibrations and my changes in a dark room. These are stills from Super 8 off Netflix on my PS3.
Old settings: Backlight 47, Brightness 50, Local dimming off.
New settings: Backlight 25, Brightness 75, Local dimming high.Edited by DanM412 - 12/5/12 at 3:55am