If 4K120 or VRR drops to 4K60/1080p or shows black screens, the HDMI chain is failing negotiation. Use this ordered checklist to restore full bandwidth.
Quick answer
- Move the console to the TV’s HDMI 2.1/4K120/eARC port and reseat both ends of the cable.
- Swap in a certified Ultra High Speed HDMI cable to rule out bandwidth issues.
- Start at 4K60 SDR/HDR, then enable 120 Hz, then VRR; back down one step if the screen goes black.
- Enable Enhanced/8K/4K120 for that input on the TV/receiver and update firmware on all devices.
Symptoms
- TV shows only 4K60/1080p when 120 Hz is selected.
- Black screen or flicker when enabling VRR or Dolby Vision gaming.
- Console test screen reports HDMI 2.0/limited bandwidth.
Quick checks
- Confirm the exact port supports 4K120/VRR (often only one or two ports do).
- Remove switches/splitters while testing; connect console → TV directly.
- Power-cycle in order: TV → receiver (if any) → console to rebuild EDID/HDCP.
- If a receiver is in line, set HDMI Out to Enhanced/8K and disable extra video processing.
Step-by-step fix
- Use the best port with a certified cable – Plug the console into the TV’s HDMI 2.1/4K120 port with a certified cable. Recommended: Certified Ultra High Speed HDMI cable (paid link).
- Lock a stable base mode – Set the console to 4K SDR/HDR at 60 Hz. Confirm a stable picture before turning on 120 Hz.
- Add 120 Hz, then VRR – Enable 120 Hz. If stable, add VRR. If either fails, revert one step and retest.
- Force Enhanced/4K120 on the port – Enable Enhanced/8K/4K120/Deep Color for that exact HDMI input on the TV and receiver.
- Minimize processing while testing – Turn off motion smoothing, ALLM toggles, and extra video processing until the link is stable.
If it still fails
- Test console → TV direct. If 4K120 works there, the receiver/HDMI switch is the bottleneck.
- Try 4:2:0 chroma to reduce bandwidth while validating stability.
- Replace long/in-wall runs with a short certified cable; use active/fiber HDMI 2.1 for long distances.
- If Dolby Vision 120 Hz is unavailable, use HDR10 at 120 Hz or Dolby Vision at 60 Hz depending on the TV’s support.
FAQ
Do I need HDMI 2.1 for 4K120? Yes—4K120 requires HDMI 2.1 bandwidth end to end, including ports and cables.
Why does VRR cause black screens? VRR raises bandwidth and timing changes; marginal ports or cables often fail when VRR is added.
Can ALLM or motion settings break 120 Hz? Some TVs glitch when ALLM/game modes toggle. Disable them while stabilizing the signal.
Should I skip the receiver? For testing, yes. If direct-to-TV works, upgrade the receiver path and set HDMI Out to Enhanced/8K.