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I'm trying to turn off an LG TV with Raspberry PI 4, with LibreELEC.

I've seen multiple references saying LG TV does not support standby using HDMI-CEC. And looks like the case with my TV as well. I'm able to turn the TV on using cec-client, but cannot figure out how to turn it off.

I've tried "standby 0", "is" with cec-client, turning off HDMI using tvservice -o, without any luck.

I'm curious here.
My Fire Stick connected to the same TV seems to be able to reliably turn on/off the TV. This gives me enough encouragement to try out before giving up, but I don't know what else to look at now.

Does anyone know how Fire Stick would be turning off the TV? Is there a way to "look"/"sniff" how is it working. Anything else I should try with Pi that might work with LG TVs?

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  • I've voted for this to be closed as this is not really a Pi question, rather a TV one. Saying that, if you can send bytes try sending E0 36 (hex). This is the standard power off sequence.
    – user115418
    Commented Sep 18, 2020 at 18:25
  • Sure. Also, the E0 36 sequence also doesn't work. Commented Sep 19, 2020 at 11:30
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    @nisargjhaveri I think you should add the commands you have tried in its complete form. Commented Sep 19, 2020 at 15:46
  • Reading github.com/olajep/rpi-cecd/issues/7 it sounds like LG do not follow the standards maybe if you can capture the codes from the Fire box and decode via cec-o-matic.com else it's a hunt for simplink command list:-(
    – user115418
    Commented Sep 19, 2020 at 18:24
  • Have you ever figured out this riddle? I am running into exactly the same problem (with exactly the same frustrating observation that the FireStick manages to turn it on/off)…
    – Dave
    Commented Dec 17, 2020 at 18:36

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cec-client which you are using and his library libCEC doesn't support Power Off on LG TV's. You can see the list of functions supported here: http://libcec.pulse-eight.com/Vendor/Support

On the bottom of the table for LG says: Supported by all devices except TVs

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  • While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review
    – Chenmunka
    Commented May 29, 2022 at 20:52

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