If the screen appears in black and white when a set-top is connected, it may be due to a poor HDMI cable connection.
If the screen appears in black and white only in certain channels, it is likely an issue with the broadcast signal rather than the TV itself.
Causes and Symptoms
- The HDMI connection to your set-top box is bad.
- The broadcast signal is unstable.
Wait! Find out more
There is an [Accessibility] function in your TV that can enable black and white display during TV operation. (Products released in 2020 or before with WebOS 5.0 or later)
If the [Grayscale] option is enabled in [Accessibility] in the TV Settings, disable it.
If the [Grayscale] option is enabled in [Accessibility] in the TV Settings, disable it.
[2021 WebOS 6.0] How to change the Accessibility option
Press the 
button on the TV remote and select [All Settings] → [General] → [Accessibility] → [Grayscale] → [Off].
[2020 WebOS 5.0] How to change the Accessibility option
Press the 
button on the TV remote and select [All Settings] → [Accessibility] → [Grayscale] → [Off].
Adjusting the contrast and color saturation can also affect the color output.
Switch the Picture Mode to the Standard Picture.
To reset the picture and sound settings, press the [Mute] button on the AI (Magic) remote control three times in a row.
Switch the Picture Mode to the Standard Picture.
To reset the picture and sound settings, press the [Mute] button on the AI (Magic) remote control three times in a row.
Try this
Have you checked the HDMI cable?
➔ Try reconnecting the HDMI cable to the set-top box.
Turn off the power of the TV and the set-top box, disconnect the HDMI cable on the back of the TV and the set-top box, and reconnect it.
Make sure that you use an HDMI cable version 2.0 or later.
Make sure that you use an HDMI cable version 2.0 or later.
This guide was created for all models, so the images or content may be different from your product.
