HDMI picture cuts out intermittently

Record how long the screen goes blank, whether audio continues, whether an input banner or no-signal message appears, and whether the source restarts or changes resolution. Check whether the picture returns by itself or only after changing inputs. A very brief black frame during a source/device transition is different from repeated loss while a stable video is playing.

1. Check whether the TV remains on the same HDMI input during the dropout.

   If the input changes or a device banner appears, inspect HDMI-CEC and source switching rather than treating it as a cable dropout.

   If that does not help: If the input stays fixed and the picture returns on its own, continue with signal-path tests.

2. Compare the affected source with a built-in app and another HDMI device, if available.

   If built-in apps are stable and one HDMI source drops, focus on that source, cable, port, or any intermediate receiver.

   If that does not help: If several sources drop, note whether they share the same HDMI port, receiver, power strip, or display mode.

3. Note whether audio also stops and whether the external device indicates a restart or format change.

   A simultaneous audio/video loss can point to a broader connection interruption; video-only loss may involve a format or display-path negotiation.

   If that does not help: Do not infer a specific component from the audio pattern alone; record it for support.

1. Reseat both ends of the HDMI cable and confirm the plugs are in the source output and TV input, not another port with a similar label.

   If the dropout stops, a loose connection may have contributed; observe the same content before concluding the issue is resolved.

   If that does not help: If it returns, try another TV HDMI port and select the matching input, changing only that variable.

2. Test a known-good cable suitable for the source’s resolution/refresh rate without changing the source mode.

   If a cable change alone stops the dropout, keep the cable model and signal mode as support evidence.

   If that does not help: If the symptom persists, restore the original cable and compare the source directly on the TV if a receiver/switch is in the chain.

3. If an intermediate receiver, splitter, dock, or capture device is used, connect the source directly to the TV temporarily.

   A stable direct picture points toward the intermediate link or its pass-through settings.

   If that does not help: If the direct path also drops, check the TV port and source output with each manufacturer’s diagnostics.

Some sources change resolution, refresh rate, HDR, or variable-refresh behavior when a game, app, or menu starts. A brief blank during a mode transition can be expected on some combinations, while repeated dropouts during steady playback need further investigation. For a PlayStation 5, Sony’s output guide documents a video-transfer-rate adjustment that can help when the screen flickers; that is a console-specific option and should not be applied to unrelated devices without their own guidance.

1. Compare the source’s current output signal before and during the event, using its official status/settings screen if available.

   If the mode changes at the same time, check whether the TV port and every intermediate device support that exact combination.

   If that does not help: If the source does not expose signal status, reproduce the event with one game/app and report when it occurs.

2. If the source manufacturer provides a documented lower transfer rate or compatible-mode test, try it temporarily and change no other setting.

   If stability improves, retain the original and test values so support can assess the bandwidth/compatibility boundary.

   If that does not help: Restore the original mode if it makes no difference; do not reduce picture quality permanently without confirming the cause.

A screen can go black because the TV briefly switches to another HDMI input after a connected device wakes or sends a control command. Check the input indicator and whether the TV returns to the original source. If it actually changes inputs, use the separate input-switching/CEC diagnosis rather than changing cable bandwidth settings. Sony documents temporary blanking linked to HDMI-CEC input changes on specific BRAVIA/device combinations.

If the dropout follows one source across TV ports, contact that device’s manufacturer. If multiple sources drop only on one TV input, contact the TV maker with the port and cable tests. If bypassing a receiver fixes the problem, take the source mode and direct-versus-routed results to the receiver manufacturer. A short recording of the screen and visible input banner can help, provided it does not expose private account information.

• TCL HDMI connection troubleshooting — checked 2026-10-24
• Samsung picture troubleshooting and HDMI cable test — checked 2026-10-24
• Sony TV briefly goes black when certain HDMI devices turn on — checked 2026-10-24

Why does my TV screen go black for a second over HDMI?

The source may be changing video mode, the HDMI link may briefly drop, or the TV may switch inputs after a control command. Check whether the input banner changes and compare another source or a direct connection.

Is a brief black screen always an HDMI cable problem?

No. The source, receiver, TV input, video mode, or HDMI-CEC behavior can also be involved. Test one link at a time before replacing the cable.

Is this the same as a flickering TV picture?

Not necessarily. A signal dropout briefly removes the image, while brightness flicker changes the visible image. Note whether the picture disappears completely and whether the input changes.