Getting 4K120 or VRR working with modern consoles and TVs can feel like solving a puzzle. One wrong setting or cable can drop you back to 4K60 or even 1080p, and sometimes the screen just goes black when you enable the higher refresh rate.
Quick answer
- Use the correct HDMI port — many TVs only support full-bandwidth HDMI 2.1 on one or two ports
- Enable enhanced HDMI mode on your TV for the specific port your console uses
- Replace with Ultra High Speed HDMI cable — 4K120 pushes far more data than standard cables can handle
- Update firmware on both console and TV before troubleshooting
- Test console direct to TV before blaming your receiver
Symptoms
- Console reports that 4K120 or VRR are "not supported" even though your TV advertises them
- Screen goes black when enabling 120Hz or VRR modes
- Console drops back to 1080p or 4K60 unexpectedly
- VRR flickers or causes display instability
- HDR stops working when 120Hz is enabled
Quick checks
- Confirm the port supports 4K120/VRR — look for labels like "4K 120," "Game," or "HDMI 2.1" in your TV manual
- Use a certified Ultra High Speed HDMI cable — a cable that worked fine at 4K60 can fail at higher refresh rates
- Update firmware on both the console and TV — both sides have shipped fixes for VRR and 4K120 stability
Step-by-step fix
-
Connect to the correct HDMI port — use your TV's designated HDMI 2.1 port (usually HDMI 3 or 4)
-
Enable enhanced mode on your TV — go to Settings → Inputs → HDMI Enhanced and turn it on for your console's port
-
Set console resolution to 4K first — choose 4K (UHD) at 60Hz with HDR enabled and confirm this is stable
-
Enable 120Hz gradually — once 4K60 is solid, enable 120Hz in your console's display settings
-
Test VRR after 120Hz works — if 4K120 is stable, then try enabling VRR
-
Adjust TV picture settings — use Game mode or turn off aggressive motion processing and noise reduction
-
Configure receiver settings (if using one) — enable 8K/4K Enhanced or highest bandwidth mode in HDMI settings
If it still isn't working
Test console direct to TV — connect your console directly to the TV's best HDMI 2.1 port, bypassing any receiver. If this works but fails through the receiver, you're dealing with a receiver bandwidth limitation.
Try disabling ALLM — some TVs interact poorly with Auto Low Latency Mode. Disable it temporarily while stabilizing the picture.
Consider compromising — if 4K120 keeps failing but 4K60 with VRR is stable, the more reliable mode may be worth keeping.
Contact support with evidence — if your hardware explicitly supports 4K120 but still fails with a known-good cable, collect screenshots of your console's test page and TV's HDMI settings when contacting manufacturers.
Want the Best Picture for Your PS5?
If PS5 4K, HDR, or HDMI issues keep coming up, the TV you're using matters as much as the settings. Our best gaming TVs for PS5 and Xbox guide covers TVs with 4 HDMI 2.1 ports, sub-10ms input lag, and proper VRR support — so you can run 4K/120Hz without black screen or handshake issues.
FAQ
Q: Why does my screen go black when I enable 120Hz? A: This usually means your HDMI cable can't handle the bandwidth or your TV's enhanced HDMI mode isn't enabled for that port.
Q: Can I use my old HDMI cable for 4K120? A: Probably not. 4K120 requires Ultra High Speed HDMI cables rated for 48Gbps. Older cables that work fine at 4K60 will often fail at 120Hz.
Q: Do all HDMI ports on my TV support 4K120? A: No. Most TVs only have full HDMI 2.1 bandwidth on one or two ports, typically HDMI 3 or 4. Check your manual for "4K 120" or "Game" port labels.
Q: Should I prioritize 4K120 or VRR? A: VRR typically provides more noticeable gaming improvements than 120Hz. If you can only get one working reliably, choose VRR with 4K60.