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An HDMI error usually means your TV is not receiving or accepting a usable signal from the selected source. Check that the source is powered on and the TV is set to the HDMI input it uses, then reseat the cable and restart both devices. “HDMI error” is a symptom, not a diagnosis: the issue may involve the input, cable, source device, video format, or protected-content handshake.
Start with the TV input and source power
For a “No signal” message or no picture or sound, first confirm that the device connected by HDMI is on. Then select the TV’s HDMI input that the device is actually plugged into. A compatible device may switch inputs automatically, but verify the selection rather than relying on it. See Sony’s HDMI troubleshooting guidance and the instructions for your specific TV and source device; input names and controls vary by model.
Reseat the cable, then restart both devices
Reconnect both ends
Disconnect the HDMI cable at both ends and plug it firmly back in. Make sure it runs from the source device’s HDMI output to the TV’s HDMI input. A loose connection or cable routed to the wrong port can prevent a usable signal. Philips includes cable reconnection in its HDMI connection troubleshooting.
Power-reset the TV and source
Turn off the TV and connected source, unplug them, then reconnect and turn them on. The unplug interval depends on the manufacturer’s instructions: TCL gives 30–60 seconds as an example, while Philips recommends 30 seconds in its setup guidance. These are model-specific instructions, not a universal timing requirement. TCL’s steps are in its HDMI troubleshooting guide, and Philips’ setup advice appears in its product manual.
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Isolate the part of the HDMI path causing trouble
Change one connection at a time so you can see whether the error follows a particular device, input, or intermediary.
- Connect the source to a different HDMI input on the TV and select that input.
- If the signal passes through a receiver, soundbar, switch, splitter, adapter, or extension, temporarily remove it and connect the source directly to the TV.
- If possible, test the source on another TV, or connect a different source to the original TV input.
If several sources fail on one TV input, that input or the TV may need attention. If only one source fails, start by checking that device’s connection and output settings. Philips also recommends testing the connection path in its HDMI troubleshooting steps.
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Check the cable if the error persists
Try a known-working cable that supports the video format you need and is suitable for the cable length and both devices. TCL recommends trying a different High Speed HDMI cable for unstable video; Philips recommends a certified cable in its HDCP troubleshooting. Those suggestions make a cable swap a useful diagnostic test, not proof that the cable caused every HDMI error. Compare the cable’s supported capability with the specifications for your TV and source before replacing it.
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Fix a “resolution not supported” message
This warning points to a mismatch between the format the source is outputting and what the TV can accept or is configured to receive. Check both devices’ supported resolutions and HDR capabilities, then set the source to a compatible output. Philips gives a source set to 4K HDR when the TV is not configured to receive that format as one example; the available options and menu paths depend on the models. Refer to the Philips manual and your devices’ manuals for model-specific settings.
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Understand an HDCP-related error
HDCP is used to authenticate connections when protected content is played. Philips identifies authentication failure as a possible cause of an HDMI error. Switch to another TV input or source and back, restart the TV and connected device, and reconnect the cable. If the message remains with protected content, bypass intermediary equipment and test a direct connection. A cable change may be worth testing, but it is not a guaranteed fix; contact the TV or source manufacturer if the error continues. See Philips’ HDCP and HDMI troubleshooting advice.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to contact the TV or device maker
- Several known-good sources fail on the same TV input after you have checked the input selection, cable seating, and direct connection.
- The TV’s own menus or built-in apps also show display problems, suggesting the issue may not be limited to the external HDMI path.
- The error follows one source across different TV inputs or displays; check that source’s settings and consult its manufacturer.
Before contacting support, note the exact message shown, which source and TV input you used, whether the connection was direct, and which checks changed the result. This gives support a clearer picture of the failure without assuming a specific part is defective.
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