Switch works handheld.
No picture on the TV?

Identify the console before swapping accessories

Nintendo Switch or Switch – OLED Model

Use the original-family checklist below. Nintendo lists the HAC-007 dock and the LAN-equipped HEG-007 dock. OLED can use the older dock; original Switch can use the LAN dock with system software 11.0.0 or later. Keep the console updated. Nintendo’s OLED compatibility FAQ explains the combinations.

Nintendo Switch Lite

Stop this TV checklist. Lite does not support TV mode or any dock. An HDMI adapter cannot enable that missing mode. Continue playing on its built-in screen; a TV setting or console reset will not add TV support.

Read model labels on the accessories; dock color is not a reliable identifier. If the handheld display is also blank or the console will not start, use the Switch power guide first. This page assumes you can reach HOME and operate the console.

Establish a stable handheld starting point

Save the game and finish any update or download before disconnecting power. Note the TV’s message and the current cable arrangement. Stop if you find liquid exposure, a burnt smell, a frayed lead, a loose or visibly damaged connector, or unusual heat. Do not keep trying damaged equipment.

1. Turn the TV off, lift the console out of the dock, and disconnect the dock’s cables.
2. Unplug the Nintendo HAC-002 AC adapter from both ends—the outlet and dock/console—and leave it disconnected for at least 30 seconds. Unplugging only its USB-C end does not complete this adapter reset.
3. Connect that adapter directly to the console and a wall outlet. Leave the console undocked. Wake it with POWER if needed and confirm that HOME is usable.

Nintendo describes this adapter reset in its TV connection / supplied-adapter error guide. A random USB-C charger is not the reference adapter for this test. If the console cannot display HOME here, stop the TV comparisons and follow the power guide.

With stable power and the console undocked, open System Settings → System → System Update and follow any offered update. If already current, save work, hold POWER for three seconds, then choose Power Options → Restart. This is a normal restart of a responsive console. Let it finish before reconnecting; do not interrupt an update or use a forced shutdown for this test.

Rebuild a simple dock-to-TV connection

Leave out the HDMI switch, receiver, soundbar and video adapter for this comparison. Nintendo’s blank-TV checklist recommends a direct path. Temporarily losing sound through a receiver is expected while it is bypassed.

1. With the TV off and console undocked, open the dock’s rear cover. Move the HAC-002 adapter from the console to the socket labeled AC ADAPTER; plug its other end directly into the wall outlet.
2. Connect the dock’s HDMI OUT socket straight to a TV HDMI input. Note the number printed beside that TV socket—such as HDMI 2. Route cables without pinching them and close the cover.
3. Remove the console’s protective case for this test. Turn the TV on and select the input matching the socket you used.
4. Use the console’s already-paired controllers. With the console awake, lower it gently into the dock with its screen facing the same direction as the dock’s front panel. Do not push against resistance or wiggle it to force a connection.

Nintendo’s illustrated TV setup shows both dock layouts. The console’s own screen turning off when docked is normal. Look for the HOME screen on the selected TV input. If it appears, test briefly before restoring extra equipment one item at a time. If adding one device brings the failure back, record that exact connection for its manufacturer’s support.

If the handheld screen stays on, gently undock once and check alignment, the removed case and the external connections. Do not probe the USB-C socket, scrape contacts, spray cleaner inside or open the dock. A screen that stays on does not by itself prove a broken connector.

Check output settings without erasing anything

Undock and open System Settings → TV Settings → TV Resolution. Note the existing choice, then try Automatic if it was fixed. If there is still no picture, try a lower resolution supported by the TV, such as 720p, and redock on the same input. Nintendo lists Automatic, 480p, 720p and 1080p for these models in its TV settings guide; use the TV manual to confirm supported signals.

If a lower setting works, keep that usable setting while investigating the TV/input/cable combination. Record the difference rather than declaring the dock repaired. Changing RGB range or screen-size calibration is a separate adjustment; it is not the first comparison for an entirely missing picture.

Let each comparison answer one question

Turn the TV off and undock before moving cables. Reselect the input afterward. Nintendo lists port, cable, TV and dock comparisons; the interpretations below are leads for your next check, not component diagnoses.

Another HDMI input works; same cable

Investigate the first input and its TV settings. Keep the working connection.

Another HDMI cable works; same input

Set the suspect cable aside. Record which change restored the picture.

The same console, dock and cable work on another TV

Check the first display’s supported signals and input configuration.

Another compatible dock works; everything else unchanged

The original dock needs attention. Swapping a whole dock-and-cable bundle cannot isolate one item.

No comparison equipment is available

Record that limitation. Assessment is reasonable without buying a test dock.

Use only undamaged equipment compatible with your console generation. Stop swapping once you have a stable, repeatable result.

A brief blink and constant flashing mean different things

Nintendo says the dock’s TV output LED briefly flashes, then goes off when the AC adapter is first connected. That alone is normal. During docked TV display, it should stay solid green. These observations come from Nintendo’s flashing dock LED guide; do not treat a brief startup blink as a failed dock.

If it keeps flashing with the console seated, complete the compatible-power, restart and applicable dock-update checks above. If another compatible dock is readily available, compare it. Persistent flashing after those checks is a stopping point, not a reason to bend contacts or repeatedly force the console down. Note whether the light was off, briefly blinking, solid or continuously flashing, and whether any TV image appeared.

Stop before a TV problem becomes data loss

Stop sooner for damage, abnormal heat, unstable power, an update that will not complete or a connector that needs force. If the direct connection and available comparisons fail, contact Nintendo or arrange a console assessment. Nintendo’s no-image guidance calls for console-and-dock service if unresolved; when a second dock fixes it, the original dock is the service target.

Bring the console, dock and AC adapter, plus your notes: model labels, system version, TV model/input, resolution, exact message, LED behavior and each comparison result. Confirm what equipment the service provider needs and discuss save preservation before authorizing work. A playable handheld is a good reason to protect what works, not to promise a particular repair or data outcome.