I have a KEF speaker and VIZIO TV. I use the Chromecast remote to control the KEF speaker volume and power. However the volume up IR code for the speaker and the back button code on the TV overlaps (I've verified it using the original speaker remote) so whenever I turn up the volume the TV also send a back-button signal to Chromecast and this is really annoying. I have to turn off HDMI CEC for the CCWGTV, but this means that I can no longer turn on/off the TV using the CC remote.

So I'd like to know if there's a way to:

- Either block the specific back-button signal from reaching the CCWGTV

- Or block all HDMI CEC signal from reaching the CCWGTV without blocking power on/off (in essence blocking HDMI CEC in the TV->CC direction)

Thanks in advance for any insight!