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Nintendo Switch OLED dock troubleshooting

Nintendo Switch OLED dock (HEG-007): what differs (from the Wikipedia device page); output; console it ships with; ports; fits older consoles, and a fix for each symptom below.

What differs (from the Wikipedia device page)
The OLED dock replaces the hidden USB 3.0 port with an Ethernet port and has a larger housing.

No powerNo displayControllerOnlineSlow downloadStorage full

Part of Nintendo gaming model troubleshooting guide

Reviewed records

2 exact answers

Diagnose the exact device problem

Nintendo · no display

Nintendo Switch OLED dock turns on but has no picture

Open record Nintendo · no power

Nintendo Switch OLED dock will not turn on

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Confirm the model first

Which units this covers, and how to tell yours is one of them

Model numbers and patterns: HEG-007

Published specification

What is true of this model and changes how you fix it

Official specifications
Size approx. 4.1in x 6.9in x 2.0in, weight approx. 0.69lbs. Output: two USB 2.0 ports on the side, system connector, AC adapter port, HDMI port, and a wired LAN port — the wired-LAN port is the concrete difference from the original (non-OLED) dock, which has no Ethernet jack and instead has one extra rear USB port.
Type — Switch OLED dock accessory (HEG-007)
This is the DOCK accessory from the Switch OLED, not a console — it carries power and video (HDMI) to the TV and adds a wired LAN (Ethernet) port. It has no controller, storage, account or game functions of its own, so those symptoms do not apply; it only outputs the docked console to a TV.
Video is 1080p
Being an original-generation Switch dock, it outputs up to 1080p to the TV — it does not add 4K (that is the Switch 2 dock). A 'no 4K' expectation here is the hardware, not a fault.
Wired LAN
Its built-in Ethernet port gives the docked Switch a wired connection — useful for online stability, and a reason to prefer it over older docks.
Output
It carries the same HDMI output of 1080p, 720p or 480p as the original dock for the Switch.
Console it ships with
The OLED model has a 7 in OLED screen and 64 GB of storage.
Ports
The OLED dock HEG-007 has two USB 2.0 ports, the USB-C adapter port, HDMI and a built-in LAN port, where the original HAC-007 dock has three USB 2.0 ports and no LAN.
Fits older consoles
An original Switch works in the OLED dock and an OLED Switch works in the old one; picture quality does not change between them.

Where these figures were read. nintendo.com/us/switch/tech-specs/ (Technical Specs — Nintendo Switch dock with LAN port)

Manufacturer support for this product line. Nintendo Support — Nintendo support. Official Nintendo Switch console, controller, display, storage and network support.

Also read for this model. Wikipedia — Nintendo Switch; Nintendo Support — Nintendo Switch OLED Model overview and FAQ.

Exact questions

Questions that only have an answer for the Nintendo Switch OLED dock

My Switch shows no picture on the TV through the OLED dock.+

Work the dock, not the console: confirm the dock's AC adapter (the high-wattage official one) is in the dock's power port, the HDMI cable runs from the dock to the TV, and the TV is on that HDMI input. Seat the console fully so it clicks in. A green light on the dock and the console charging confirm power. If it still shows nothing, try the HDMI cable/port directly, since the dock only passes the signal — it outputs up to 1080p, not 4K.

Does the OLED dock have an Ethernet port?+

Yes. It replaces one of the original dock's three USB ports with a LAN port.