Use HDMI Ultra HD Deep Color on an LG TV
Enable the enhanced mode for a compatible 4K source and disable it when an older device becomes unstable.
Direct answer
The shortest reliable path.
On supported LG TVs, HDMI Ultra HD Deep Color enables enhanced 4K input formats on the selected HDMI port. LG’s menu path varies by webOS generation, but current models place it under All Settings, General, External Devices, HDMI Settings. Enable it for a compatible 4K or gaming source, then set the source to the required 2160p output. If an older device produces flicker, lines, color problems, or no picture, LG advises disabling Deep Color for that input and retesting.
System view
Check the whole path.
- 014K source output
- 02Compatible HDMI cable
- 03Selected LG HDMI port
- 04HDMI Ultra HD Deep Color
- 05Picture or Game Optimizer mode
Scope before steps.
LG TVs with HDMI Ultra HD Deep Color connected to a 4K set-top box, console, computer, or media player.
Model-specific HDMI bandwidth tables, professional calibration, panel faults, USB playback, or unsupported source hardware.
Procedure
Do this in order.
- 01
Match the port and source
Connect the source to a port that the model manual lists for the required 4K and refresh-rate format.
- 02
Enable Deep Color for that input
Open All Settings, General, External Devices, HDMI Settings, then enable HDMI Ultra HD Deep Color for the connected port.
- 03
Set the source output
Choose automatic detection or the documented 2160p format on the set-top box, console, or computer.
- 04
Reverse the setting for legacy instability
If an older device shows lines, dots, color errors, or loss of picture, turn Deep Color off for that port and retest.
Diagnostic matrix
Read the result, not the guess.
| What you see | Check next | What it means |
|---|---|---|
| Source remains at 1080p | Confirm its output is set to 2160p and the TV input setting is enabled. | The source may not be requesting the 4K signal. |
| Picture becomes unstable only with Deep Color on | Disable it and inspect the source and cable specifications. | The source path may not support the enhanced format. |
| Game Optimizer is unavailable | Confirm the connected input and Deep Color state on the relevant webOS generation. | LG links some gaming controls to an enhanced HDMI input mode. |
Stop conditions
Know when not to keep changing things.
- Do not assume all HDMI ports or all LG model years have identical capability.
- Do not leave an older device in a visibly unstable enhanced mode.
- Do not diagnose a panel fault until the internal picture test and external signal path have been separated.