I haven't encountered the issue, but have seen others discuss something similar when using CEC to control a Sony TV, on a different forum. The solution there was to change inputs before sending the off command.
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--- On Tuesday, January 15, 2019 at 10:00 AM, mark wrote:
I have tried all the IR commands that I could find
I can turn it off with CEC, but can't turn it on with any of the commands in
the Crestron CEC Display module
I did add a 3rd power on command to the module, no luck with it either
I can only assume it uses a proprietary command set beyond the required power
off
mark