Direct answer
Docked video needs the supported power adapter, seated console, working HDMI path and TV input. Handheld display working does not prove the dock is powered correctly.
What this covers
- The observed symptom matches this record
- Customer-accessible settings, connections and external components
- Diagnosis before reset, deletion or component replacement
What it does not cover
- ×A model-specific error code with a different documented meaning
- ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
- ×A guarantee that every model exposes the same control label
Capture the exact symptom
ReversibleCheck whether the console charges in the dock and whether the TV reacts when it is inserted.
Run the smallest isolation test
ReversibleReconnect in documented order using the Nintendo adapter, connect dock directly to TV and test another HDMI input/cable.
Correct only the proven cause
ReversibleReplace the proven cable/dock/power component; update the console before testing receivers or switches.
Verify before changing anything else
ReversibleDock twice and confirm picture and sound appear after sleep/wake.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check before resetting anything?+
Check whether the console charges in the dock and whether the TV reacts when it is inserted.
What is the safest isolation test?+
Reconnect in documented order using the Nintendo adapter, connect dock directly to TV and test another HDMI input/cable.
When should I stop troubleshooting?+
Stop for bent USB-C ports, heat, liquid or a damaged adapter; do not force the console into the dock.
Answer for the exact device and software version shown above.