Meeting room TV switches inputs by itself (HDMI-CEC)

What this error means

Samsung documents this directly: HDMI-CEC (their brand name: Anynet+) lets devices command the TV — and a chatty or buggy device (a streaming stick, a room PC waking from sleep) will yank the display to its own input mid-presentation. Documented fixes: update firmware on the TV and the offending device, or turn off the auto-switching behavior.

Symptoms

• Display jumps to another input during meetings
• TV turns on/off by itself
• Started after adding a new device

Try this first (safe DIY steps)

1. Identify the culprit: which device was added or updated most recently?
2. Update TV firmware and the device's firmware — Samsung explicitly documents buggy CEC devices being fixed this way
3. If it persists, disable CEC/Anynet+ (Samsung: Settings → General → External Device Manager → Anynet+) — you lose one-remote convenience, gain meeting stability
4. In dedicated conference rooms, disabling CEC is usually the right trade

Safety: power off before any physical intervention. Never bypass covers or interlocks — fuser areas run hot enough to burn.

When to call a technician

Not a service issue — it's configuration.