In this guide
Your TV is showing the wrong resolution through HDMI because the source device output doesn’t match your TV’s native resolution — usually caused by a failed EDID handshake, incorrect display settings, or an underpowered cable.
- Source device is set to the TV’s native resolution (1080p or 4K)
- HDMI cable supports required bandwidth (HDMI 2.0+ for 4K)
- TV capabilities are detected correctly via EDID
- TV capabilities go undetected and source defaults to 720p
- PC scaling or display settings are mismatched
- Cable or port doesn’t support the required HDMI version
What Causes the Wrong Resolution Over HDMI?
When you connect a device to your TV via HDMI, the source reads the TV’s supported resolutions through a process called EDID (Extended Display Identification Data). If that handshake fails — due to a bad cable, wrong port, or timing issue — the source falls back to a safe low resolution like 720p or even 480p.
On a PC, the GPU may also apply incorrect scaling or choose the wrong display output profile, which overrides what the TV actually supports.
How to Fix HDMI Resolution Problems
- Check your source output settings. On a PC, go to Display Settings and set the resolution to match your TV’s native spec. On a console, find the video output settings and select the correct resolution manually.
- Power cycle both devices. Turn off the TV and source, unplug both, wait 30 seconds, then reconnect. This forces a fresh EDID handshake.
- Try a different HDMI port. Some TV ports are HDMI 2.0 (4K-capable) while others are HDMI 1.4. Check your TV manual to confirm which ports support 4K.
- Upgrade your HDMI cable. A cable rated for HDMI 1.4 cannot carry 4K at 60Hz. Use a High Speed or Premium High Speed cable for 4K content.
- Update firmware. Outdated firmware on your TV or source device can cause EDID misreads. Check for updates in the device settings.
Quick Reference: Common Setups
| Setup | Works? | Need | Note |
|---|---|---|---|
| PC to 4K TV, HDMI 2.0 cable | Yes | Set GPU to 4K output | Confirm port is HDMI 2.0 |
| Console to 1080p TV, HDMI 1.4 cable | Yes | Set console to 1080p | No issue at 1080p/60Hz |
| PC to 4K TV, HDMI 1.4 cable | No | HDMI 2.0+ cable | Bandwidth too low for 4K |
| Any device, EDID failure | No | Power cycle or new port | Source defaults to 720p |
PC-Specific Resolution Issues
Windows and macOS sometimes apply display scaling that makes the output look lower quality even at the correct resolution. On Windows, right-click the desktop, open Display Settings, and confirm both resolution and scaling percentage are correct. If you’re using a USB-C to HDMI adapter, the adapter itself may limit output resolution — check its rated specs before troubleshooting the TV.
For adapter-related signal problems, our guide on why USB-C to HDMI isn’t working covers similar EDID and bandwidth issues in detail.
Sony’s official support page also covers HDMI resolution troubleshooting steps for their TVs, which applies broadly to most displays.
Bottom line: An HDMI wrong resolution on TV almost always comes down to three things — the wrong output setting on your source, a failed EDID handshake, or a cable that can’t carry the bandwidth. Fix the cable first, then power cycle, then adjust your output settings manually if the TV still doesn’t display correctly.