The TCL QM7 from 2024 has a 144 hertz panel with variable refresh rate, and when game mode or VRR does not work, the cause is usually a port, a cable or a setting, because only some conditions give the full feature set. Start with the port. On many TCL sets only certain HDMI ports carry 4K at 120 or 144 hertz and VRR, and the others are limited to 60 hertz; check the labels on the back and the manual for which ports support it, and connect the console or PC to one of them.
The checks in more detail
Use an HDMI cable certified as Ultra High Speed, since a cheap cable limits the signal and causes a black screen or flicker at high refresh rates. The same goes for a cable passed through a soundbar or receiver: connect the game direct to the TV and use eARC for sound. Then the settings. In the TV's settings, under Picture or Inputs, find Game Master or Game mode and enable it, and check that the HDMI port is set to the enhanced signal format, sometimes called HDMI 2.1 mode or Enhanced format, because the default may be standard.
Game mode lowers input delay by turning off processing; the TV may switch to it automatically if the console sends a signal. On the console, turn on 120 hertz and VRR in the video settings, and test with a title that supports it. On a PC, set the refresh rate in Windows display settings and enable Adaptive Sync or G-Sync Compatible in the graphics driver's control panel. VRR flicker, where dark scenes pulse in brightness, is a known behavior of some LCD panels with variable refresh, and it can be reduced by capping the frame rate or turning off VRR in a given game.
If the picture shows lines or drops out at 144 hertz, drop to 120 or 60 as a test. Update the TV's software and the console or graphics driver, since support is improved this way. Check that Dolby Vision gaming and HDR are matched to the device's settings. If the TV never lights the game mode indicator or the VRR option is grayed out after a good cable and the right port, contact TCL with the model number.
Differential
Likely causes of “TCL QM7 QLED Mini-LED TV game mode, 120 Hz or VRR is not working”, and how to tell them apart
- 1
The wrong HDMI port
What separates it VRR or 120 hertz is not available
How to confirm Use a port that supports it
- 2
A cable that cannot carry the signal
What separates it A black screen or flicker at high refresh
How to confirm Use an Ultra High Speed cable direct to the TV
- 3
The enhanced HDMI format is off
What separates it Options grayed out
How to confirm Turn it on for that input
- 4
Console or PC settings
What separates it No VRR in the game
How to confirm Turn on 120 hertz and VRR on the device
- 5
VRR flicker on an LCD
What separates it Dark scenes pulse
How to confirm Cap the frame rate or turn off VRR
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which port is used
- The cable
- The device and its settings
- The refresh rate and resolution
Try in this order
0 of 6 completedUse a supported HDMI port
ReversibleCheck the labels.
Use an Ultra High Speed cable
ReversibleDirect to the TV.
Turn on the enhanced format
ReversibleFor that input.
Enable 120 hertz and VRR
ReversibleOn the device.
Update the TV and device
ReversibleTo the latest.
Test another game
ReversibleTo isolate it.
Model-specific
What is true of this model and not of its siblings
- Port limits
- Only some ports carry the full signal.
- Cable
- Use Ultra High Speed.
Stop boundary
When this stops being a self-service repair
- !If VRR is grayed out with a good cable and port, contact TCL with the model number
- !Update the TV and the device
- !Test another game
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Do all QM7 ports support 144 hertz?+
No, check which ports do.
Why is VRR grayed out?+
The port, cable or setting.
What is game mode?+
It cuts processing for lower delay.
Why do dark scenes flicker?+
A known LCD behavior with VRR.