- TVs
- Smart TV
No Signal
LG "No Signal" on Smart TV: input mode, set-top box or cable
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
The TV is not receiving a signal from the set-top box or service provider on the current input. Check the input mode, make sure the external device is on, restart the set-top box and router for five seconds and reseat the cables.
Safety first
Stop and check this first
- If the volume bar appears, the TV is working: check the external device and cables before booking a TV repair.
Safe checks you can perform
- Input mode and device power
- Volume bar test
- Hard reset of the TV
- Restart set-top box, router and cables
Leave these tasks to a qualified professional
- Do not attempt this professional task: Service provider inspection of the set-top box
- Do not attempt this professional task: LG professional diagnosis
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Service provider inspection of the set-top box
What they doIf "No Signal" remains after the resets, the provider inspects the set-top box and the service.
They must show youthe box output working.
In writingthe fault found and fix.
LG professional diagnosis
What they doIf the TV is on but shows no message or picture at all, an LG technician diagnoses the TV.
They must show youthe test that locates the fault.
In writingthe diagnosis and any replaced part.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
Input mode and device power
No special tools
Procedure
- Who:
- you.
- How:
- press the Home Hub or External Input button on the remote. For a wired cable connection select Live TV; for a set-top box or HDMI device select its HDMI port. Make sure the device is on.
- Result that matters:
- whether the picture appears on the right input.
- If it appears:
- the input or the device power was the cause.
- If it stays:
- check the volume bar.
- Evidence to keep:
- the input name in use.
Evidence: [LG TV] Troubleshooting an LG TV With No Picture and No Sound
- 2
Volume bar test
No special tools
Procedure
- Who:
- you.
- How:
- press a volume button on the remote and watch whether the volume bar appears.
- Result that matters:
- whether the bar shows on screen.
- If it appears:
- the TV works; the issue is the external device or cable connections.
- If it does not appear:
- there may be an issue with the TV; do the hard reset.
- Evidence to keep:
- a photo of the screen with or without the bar.
Evidence: [LG TV] Troubleshooting an LG TV With No Picture and No Sound
- 3
Hard reset of the TV
No special tools
Procedure
- Who:
- you.
- How:
- disconnect the TV power cable, press and hold the physical Power button on the TV for about 10 seconds, then reconnect the power cable and turn the TV on.
- Result that matters:
- whether the TV starts normally with a picture.
- If it does:
- it was a temporary lock.
- If it does not:
- restart the set-top box and router.
- Evidence to keep:
- whether the standby light was on or off.
Evidence: [LG TV] Troubleshooting an LG TV With No Picture and No Sound
- 4
Restart set-top box, router and cables
No special tools
Procedure
- Who:
- you.
- How:
- unplug the set-top box power cable and reconnect it after five seconds. Do the same with the router. Reconnect the cables securely into the correct ports, including the set-top box HDMI cable.
- Result that matters:
- whether "No Signal" goes away.
- If it goes away:
- the box, router or a cable was the cause.
- If it stays with "No Signal":
- inspect the set-top box or contact your service provider.
- If the screen is blank with no message:
- contact LG Customer Support.
- Evidence to keep:
- which steps you did and the result.
Evidence: [LG TV] Troubleshooting an LG TV With No Picture and No Sound
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- TVs
- Brand
- LG
- Product type
- Smart TV
Known code variants
- Cable HDMI desconectado
- LG TV no signal
- mensaje no hay señal LG
- No hay señal
- Samsung TV no signal
- Señal débil
- Sin señal
- Weak Signal
What it means
LG shows "No Signal" when the TV is not receiving a signal from the set-top box or service provider. LG separates three cases: if the volume bar appears, the TV works and the issue is likely the external device or cable; if the TV is on but shows no message or picture at all, the TV itself may need diagnosis by an LG professional. LG's steps are checking the input mode, a hard reset, restarting the set-top box and router and reseating cables. The message alone does not mean the TV is faulty.
Warnings and stop conditions
- Loweditorial warning
If the volume bar appears, the TV is working: check the external device and cables before booking a TV repair.
Evidence: [LG TV] Troubleshooting an LG TV With No Picture and No Sound
Symptoms and causes
Probable causes · in order
- Wrong input modeCommon
The TV is on another input; selecting Live TV or the connected HDMI port brings the picture back.
Evidence: [LG TV] Troubleshooting an LG TV With No Picture and No Sound
- External device off or set-top box faultCommon
The volume bar appears, so the TV works; the device is off or the box needs a reset or inspection.
Evidence: [LG TV] Troubleshooting an LG TV With No Picture and No Sound
- Loose or wrong cable connectionPossible
The message goes away after reconnecting the cables securely into the correct ports.
Evidence: [LG TV] Troubleshooting an LG TV With No Picture and No Sound
Virtual technician
Does No Signal still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
[LG TV] Troubleshooting an LG TV With No Picture and No Sound
LG · 2026 · official_doc
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