Your TV says “No Signal” when it cannot receive a usable picture from the source on the HDMI input you selected. The message alone does not mean the TV is broken. First check that the source is on and that the TV is set to the port the cable actually uses; then test the cable, ports, and source in turn.
What “No Signal” means
The TV is not detecting a usable signal from the connected device—such as a game console, cable box, streaming player, or disc player—on the selected input. The cause may be as simple as the wrong input or a sleeping source, or it may involve a cable, port, device, or video-format setting. Sony, Samsung, and LG all recommend checking the source, input, and connection before seeking repair (Sony; Samsung; LG).
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Check the simple causes first
The source device is off or asleep
Turn on the connected device and wake it from standby. A TV cannot display a picture from a source that is not actively sending one. Check for a power light or other sign that the device has started.
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The TV is set to the wrong HDMI input
Use the remote’s Input or Source button (the label varies by model) and choose the input matching the physical port. If the cable is plugged into the TV’s HDMI 2 socket, select HDMI 2—not HDMI 1 or another input. Check the labels beside the sockets if you are unsure.
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The connection is loose or the cable may be faulty
A plug that is not fully seated, or a cable that has failed, can interrupt the signal. Reseat the cable at both the TV and source ends. Look for obvious damage or looseness. If you can borrow another HDMI cable, test it before buying one; Sony and Samsung both recommend a cable swap as a troubleshooting check (Sony; Samsung).
Follow this order to isolate the problem
- Confirm power and input. Turn on the source device, then select the TV input that matches the port in use.
- Reseat the HDMI cable. If needed, turn off the TV and source first, then disconnect and reconnect the cable firmly at both ends. Inspect the plugs and ports for obvious damage.
- Test another cable. Use a known-working cable if one is available. A picture with the alternate cable points toward the original cable, though it does not by itself prove exactly what failed.
- Try another TV HDMI port. Move the cable to a different port and select that port’s input on the TV. If the picture returns, the original port or a setting associated with it may be involved; the swap is evidence, not a definitive diagnosis.
- Restart both devices. Turn off the TV and source, wait about 60 seconds, and turn them back on. Sony recommends this wait in its general HDMI troubleshooting steps; unplugging for a power reset is another option described in its support guidance. Follow your model’s manual if its controls or power connections differ (Sony support).
- Test another source device. Connect a different HDMI device to the same TV port. If it works, the original source or its output settings become more likely causes. If the original device works on another display, the TV input or port becomes more likely. These comparisons narrow the possibilities but do not guarantee a diagnosis (Samsung; Sony HDMI tips).
If the problem happens only with a high-resolution or high-refresh-rate picture
Check the output mode selected on the source, as well as the capabilities of the cable and the specific TV port. A connection that works at a lower video setting but fails at a demanding one may be a format or bandwidth compatibility issue rather than a completely failed connection. Supported formats depend on the TV, source, port, settings, and cable.
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Samsung says that 4K at 120 Hz requires a certified HDMI 2.1 cable and notes that lower-quality cables can still cause issues (Samsung support). Check the manuals for both devices before changing output settings or choosing a cable; do not assume every HDMI port on a TV supports every format.
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When to contact support
If you have matched the input, checked the source, reseated or swapped the cable, tried other ports, and tested another device where possible, contact the manufacturer of the component the comparisons implicate. A problem that follows one source across displays points more toward that source; a problem limited to one TV port points more toward the TV or that port. These are troubleshooting clues, not conclusive remote diagnoses. Samsung notes that a TV port may be damaged if its troubleshooting does not resolve the issue, and LG directs users to customer service when its steps fail (Samsung; LG).
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