Smart TV with Color issue - Page 1
Forum section: electronics / repair

author: shiro007
author_rank: Newbie
timestamp: March 06, 2025, 02:06:59 pm
content: I have a smart tv where the color red has an issue. Blue also has a minor issue but it gets solved with setting color temperature of 6500K. Skin tones look like it has too much contrast because of it. However when I decrease the contrast from PC side via GPUs software. It becomes okay. But the contrast needs to be very low 100 is normal contrast. I have to reduce it to 60ish which is basically Output image with 40% less contrast. If i change it on TV side it needs to be literally 0 for red to fall in line.The first image is how it looks normally with no modifications. 2nd image is applying 6500K color temp from PC side. 3rd is after decreasing contrast from PC Side.Also even tho at 60% contrast on pc side skin tones and reds get better, White based images look bad along with it being hard to read text with that setting.I just want to know if its the tcon board or the lcd panel itself. The Smart TV Mainboard is new so its not an issue with it. So its between the Tcon board and LCD Panel

author: Halcyon
author_rank: Unknown
timestamp: March 07, 2025, 02:14:35 am
content: Shiro007, you seem to already have an account on this forum as Heindal, also I banned another one of your duplicate accounts "keikai" as you never responded to my private message. Please indicate which account you wish to keep.

author: Whales
author_rank: Super Contributor
timestamp: March 07, 2025, 02:41:02 am
content: The red and green channels are crushed at the top and bottom, nasty. Does it have the usual set of brightness/contrast/gamma controls in the TV settings? Make sure to turn off all fancy features like dynamic contrast too.

author: shiro007
author_rank: Newbie
timestamp: March 07, 2025, 04:36:00 pm
content: For hdmi input it only has Brightness, Contrast, Color (No individual color channel sliders just overall color slider), Color Temperature, DNR , Aspect Ratio. It seems to have up to 12 Bit Color depth (hdmi) with HDR. However changing it does nothing as it still has same issue. I tried changing from Full RGB 4:4:4. Limited RGB 4:4:4, YCbCr 4:4:4, YCbCr 4:2:2, YCbCr 4:2:0 (4K).I managed to Access Android hidden menu on the Android TV side and Switch HDMI from Standard (Which is default that gives the bad color) to Enhanced which enables HDR and fixes the bad blue color channel. The Red is only half fixed. While it is red it appears oversaturated in the last image above.Also I got into a another factory hidden menu, but it only allows to adjust Color temp values, Panel Settings, Emmc Setting but the actual, Basic picture settings like brightness , contrast , hue but it only determines what value the OSD sliders considers to be 0 and 100%. There is yet another setting called " PQ Advance" but i cant adjust any values there as they will go back to default.If i decrease contrast to 40 it kinda looks okay in RGB gradient test but when i open youtube or images with Skin tones the skin looks like the contrast is very high. Windows ACM solves part of issue but then it makes the whole screen darker , less contrast, less brightness and its hard on text