Meeting Room TVs error codes, explained
Samsung, LG and other displays doing conference duty. Codes below: HDMI, CEC, and standby-light guides. Each guide covers what the code means, what you can safely try yourself, when to stop and call a technician, and what the repair typically costs.
Meeting room TV says No Signal — the fix both LG and Samsung document
The industry calls it an HDMI handshake failure; the manufacturers just document the cure: power off the TV AND the source device, physically disconnect the HDMI cable at BOTH ends, reconnect firmly, and cold-boot (Samsung's version: unplug the TV itself for 30 seconds). Their other documented steps: verify the right input, try a different HDMI port, try a different (certified) cable, and update the TV firmware — Samsung even builds in an HDMI Cable Test on many models.
Meeting room TV switches inputs by itself (HDMI-CEC)
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.
TV won't turn on, standby light blinking
Samsung's documented states: solid red standby = normal (waiting for power-on); light OFF = no power reaching the TV (or it's on with a black screen); BLINKING red = a fault — after the basics fail, Samsung's documented answer is request service. Worth knowing: the blink-count code tables floating around repair forums ('5 blinks = power board') are community lore, not manufacturer documentation — treat them as hints, not diagnoses. LG publishes no blinking-light codes at all.