If you’re lucky enough to have pre-ordered the LG C3 OLED or LG G3 OLED from LG before their wider release at stores like Best Buy and Amazon, be sure to download the latest firmware update, as it will completely change the way you see your new TV.
Firmware update version 03.01.19 changes the auto-darkening feature so that dark scenes with little movement do not slowly get darker over time.
The problem was discovered and fixed by HDTVTest Vincent Toh (Opens in a new tab) Who bought the LG 42C3 and LG 65G3 with his own money and found that there was no way to set the “Temporary Peak Light Control” (TPC) in the manufacturer’s settings.
Without the ability to turn this feature off, the TV’s auto-dimming algorithm kicked in anytime there were “long, dark HDR scenes,” making them unwatchable after a few minutes.
The fix, available via remote update, changes how TPC works and won’t start auto-dimming when it plays dulled content.
Why does the LG C3 feature auto dimming in the first place?
Auto-dimming has been a feature for a few years now, but it’s really become its own thanks to the advent of Dolby Vision IQ that can adjust image brightness depending on how much ambient light there is in the room.
The idea here is that if you are in a bright room you may need your content to be brighter so you can see all the details. If you are in a dark room, the screen dims on its own so you get the best performance.
The problem that LG OLED TVs encountered appears to be a feedback loop with the ambient light sensor. The TV was in a dark room, so it dimmed the image, but then the dim image produced less light for the ambient sensor. This created a negative feedback loop as the picture became progressively darker.
There are ways to turn off auto-dimming—and, by extension, Dolby Vision IQ—completely. But LG’s fix will help people who want the convenience of auto-dimming and still, you know, be able to see the picture on their TV that they paid $2,000 for.