General
“When a TV is turned off using a remote control's power button, the circuit board inside the TV remains live with electricity because its sensor must stay awake to detect the remote's signal.”
Plain restatementPressing the power button on a TV remote puts the TV into a low power state rather than disconnecting it from mains power, because part of the TV's electronics, including the infrared receiver, continues to be powered so it can detect a later remote signal.
The basic claim checks out. When you switch a TV off with the remote, it goes into standby rather than fully disconnecting, and a small part of its electronics, including the infrared receiver and a small controller chip, stays powered so it can detect the next remote press. This is confirmed by TV manuals, power supply engineering documents and by EU rules that set legal limits of roughly 0.3 to 2 watts for off, standby and networked standby modes. Laboratory testing by NRDC measured around 0.6 watts in standby for modern TVs with smart wake features off, and considerably more with them on. Two details in the claim are overstated: it is not the entire circuit board that stays live, only the standby section, and the remote sensor is just one of several wake paths alongside HDMI control, network wake and quick start features. Also worth noting, the mains input of any plugged in TV is energised whether or not you used the remote, so only unplugging it or using a hard mechanical switch truly cuts power. Finally, residual standby power is an energy fact and is not evidence that a TV is listening to you.
[drifted from the evidence:] When a TV [drifted from the evidence:] is turned off using a remote [drifted from the evidence:] control's power button, the circuit board inside the TV [drifted from the evidence:] remains live with electricity because [drifted from the evidence:] its sensor must stay awake to detect [drifted from the evidence:] the remote's signal.
[added by the neutral restatement:] Pressing the power button on a TV remote [added by the neutral restatement:] puts the TV [added by the neutral restatement:] into a low power state rather than disconnecting it from mains power, because [added by the neutral restatement:] part of the TV's electronics, including the infrared receiver, continues to [added by the neutral restatement:] be powered so it can detect [added by the neutral restatement:] a later remote signal.
Red-tinted words in the claim drifted from the evidence. Green-tinted words are what a neutral restatement needs.
The trace / claim to source
- A TV switched off by remote is in standby, not disconnected. This is documented in manufacturer manuals, patent engineering descriptions and in regulation that sets numeric limits for the standby state.
- Part of the internal electronics remains energised in that state, including the infrared receiver and a supervisory microcontroller.
- The need to detect a remote wake signal is a genuine and historically primary reason for this residual power draw, stated directly in TV power supply patent literature.
- The residual draw is real and measurable, typically around 0.5 to 3 watts for modern sets and higher when smart wake features are active.
- Omitted qualifier regarding scope. "The circuit board inside the TV remains live" overstates the extent. In standard designs only the standby rail and associated components stay powered, while the main run supply and the bulk of the main board are unpowered. The claim reads as though the whole board is energised as in normal operation.
- Omitted qualifier regarding cause. The remote sensor is one reason, not the sole reason. Modern sets also keep circuitry alive for HDMI-CEC wake, network and voice wake, timers, scheduled updates, front panel buttons and quick start boot caching. NRDC testing shows these additional wake features, not the infrared sensor, drive the largest standby increases.
- Omitted qualifier regarding the plug. Voltage is present at the mains input section of the power supply whenever the TV is plugged in, independent of whether the remote put it in standby. The claim implies the remote sensor is what makes the set live, when physical disconnection is the only thing that removes mains voltage.
- Framing in the wider post. The surrounding transcript ends with an implication that standby power is evidence that living room devices are "eavesdropping" on you. Standby power draw is not evidence of audio capture or surveillance. That is an unsupported inference layered on a correct technical fact.
- The transcript's historical claims about symbol regulation were not the primary claim and are only partly checked. Reference sources do describe IEC 60417-5007 (on), 5008 (off), 5009 (standby, broken circle) and 5010 (on/off, line inside closed circle), and the publication of IEEE 1621 on 8 December 2004 adding a crescent moon for sleep, with the broken circle treated as a general power symbol. The specific assertion that manufacturers switched symbols primarily to avoid a safety prohibition was not confirmed against the IEC standard text itself, which is paywalled.
- The claims about iPhone power reserve chips and Windows restart versus shutdown were not investigated here. The Windows point relates to Fast Startup behaviour but was not verified against Microsoft documentation in this investigation.
- Exact standby power for any particular TV model varies by brand, settings and whether quick start or network wake is enabled. No single number applies.
Engineering and regulatory sources agree that a television switched off with a remote enters a standby state rather than a disconnected state. Patent literature describing TV power supply design states plainly that many television receivers draw standby power from the mains even when turned "off", and that this standby power is needed to supply switching circuits responsive to user inputs such as an infrared remote control receiver or a front panel button. Typical designs keep a small standby supply rail energised that feeds a microcontroller and the infrared receiver, while the main "run" supply that powers the display and processing chain is switched off. Regulators treat this as a measurable, regulated power state. EU ecodesign rules for electronic displays set maximum power demand of 0.3 W in off mode, 0.5 W in standby and 2.0 W in networked standby, with higher allowances for specific functions. A separate horizontal standby regulation, (EU) 2023/826, applies from 2025 with further tightening from 2027. The existence of distinct legal limits for "off", "standby" and "networked standby" confirms that a device presented to the user as "off" is still consuming power. Measured consumption confirms the residual draw. LBNL work on standby power documents that per device standby is now often under 1 watt but that TVs historically were the largest single source of household standby energy. NRDC laboratory testing of modern smart TVs found an average standby level of about 0.6 W with smart wake features disabled, rising substantially when smart wake features were enabled. Manufacturer documentation is explicit: a TCL manual states that when put into standby with the remote the set remains powered up but with low energy consumption, and that a Quick Start option makes the TV wake faster while increasing standby power.
Complete reasoning
The reply is formatted for pasting into the thread where the claim is circulating.