Symptoms
- Screen shows "No Signal" or "No Input"
- Message appears right after switching inputs
- Source device (console, cable box) appears to be on
- Signal returns briefly then drops again
Likely causes
- CommonWrong HDMI input selectedTVs with multiple HDMI ports show no signal if you're on HDMI 2 but the device is plugged into HDMI 1.
- CommonLoose or damaged HDMI cableA cable that's not fully seated or has a bent pin won't carry a stable signal.
- CommonSource device is off, asleep, or in standbyGame consoles and streaming boxes that are sleeping won't send a signal until woken up.
- PossibleHDMI port or cable doesn't support the resolution being sentAn older HDMI port may not handle 4K or high refresh-rate signals from a newer device.
What to do
- Confirm the TV's input selector matches the physical port the device is plugged into.
- Wake the source device by pressing a button on it directly, not just the TV remote.
- Unplug the HDMI cable from both ends and reinsert firmly, checking for bent pins.
- Try a different HDMI cable, ideally one you know works with another device.
- Test the source device on a different HDMI input on the same TV.
- Power cycle both the TV and the source device by unplugging each for 30 seconds.
- If using a 4K or high-refresh source, try lowering its output resolution in its own settings to see if the port supports it.
Tools and parts
HDMI cableSearch: “high speed HDMI cable”
When to call a pro
If every HDMI port shows no signal from multiple known-good devices and cables, the TV's HDMI board may need repair.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.