So I got a new 50MU6120 and I've been annoyed straight off the bat by global dimming that can't be disabled. I just figured it out if anyone wants to know how. So people say you are stuck using movie mode and having horrible input lag just to disable it. The trick is to get into the service menu, but you need to get the advanced tab up, highlight it and then press 0000 to make the extra options show. Power off the TV fully and then press info, menu (or settings on some remotes), mute and then power. The TV should power on and then be in the service menu. If you don't have a service remote or device with an IR transmitter, try this: To get up the extended menu, set the source to HDMI1, select Other Option and select CAL Data restore After you get a USB error go back and you should see advanced. Then highlight it and press 0000 which will reveal extra options. After you do that go Picture_2D > SubSetting and change PWM_INI_2D from 15 to 100. Problem solved. You can also change PWM_MOVIE_INI from 30 to 100 to eliminate the problem from other modes. It will still dim when the screen is fully black and the only way around it is to set PWM_MIN to whatever you use the backlight at. Just multiply your preferred backlight setting by 5 to get your answer. The only problem with doing this is if you change the backlight in the user menu and the screen goes fully black it sets itself to that setting temporarily. So I have mine on 100 meaning if I turn my backlight down lower than 20 and the screen goes fully black, the backlight will max on the black screen then go darker again when an image is displayed, so only set this to 5x what you want the backlight on and use that fixed setting. For example if you use the back light on 10, set PWM_MIN to 50 or if you use 14 then set it to 70. You can just leave it at the default setting if you don't mind it dimming on fully black screens. Most people won't but I find it annoying if a game goes black for a cutscene etc. and the picture has to fade in again. PWM_INI_2D fixes the dimming on dark (but not fully black) screens anyway which is what bothers people especially in dark scenes in games and it won't affect anything else on the TV. The backlight will still function normally in the user menu.