Include slightly older LG TVs that have full remote control via RS232?
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I've a LG Plasma TV which has a (multiplex-able, one can set an ID number to send commands to a particular set - though I guess the receive data path is not usable) via a 9-pin D-type full RS232 interface on the back. Preliminary investigations have enabled a Raspberry Pi (and a USB to serial port adapter) to bring it in/out of standby but I haven't sat down and done the local voice recognition system to literally tell the TV what to do yet...!
If I can find the PDF file (I think it was the manual for a similar, but not identical, model) would that be worth adding to this project?
Well, LG screens are already supported. But maybe I can take a look at your TV. What is the exact model ? Do you have a link to the LG website ?
I've found this document : https://www.lg.com/us/support/products/documents/eng.pdf
page 89 : The input select command looks ok
You can test the codes on your screen like so : https://github.com/YooUp/RS232-Monitor-Commands#how-can-i-test-the-rs232-codes-
Actually since I'm in the UK and my TV has PIP some of the codes may be different/extra - as mine is a 42PX5D variant I think the one I need is https://gscs-b2c.lge.com/downloadFile?fileId=KROWM000107881.pdf which I selected from https://www.lg.com/uk/support/manuals?superCateId= ...!
Page 57 of your document, the commands are the same as the ones we use.. It should work. Are power ON/OFF the only commands you need ?