I tried over 30 different model numbers on the LG list.
Tried 'Power on' or just 'power' then point the remote to the TV and clicked 'Test'

It has everything but 'LM' in the models listed.
Lx
Sx
Cx
Px
RU-x
MU-x
DU-x
M4x

Nothing has worked.

Correction on the Yamaha model above.
It should read HTR-3064.

The list for 'Audio/Yamaha' in the HTR range starts with 5140.
Within the HTR-xxxx there are a lot of 5xxx, 6xxx, 8xxx and 9xxx models.
I have tried several random picks from these.

I also have the LG BD-620 3D Blu-Ray play that isn't on the list either.

So are I have been able to do a 'Point to Point' for most of the buttons needed.

I think when it comes down to it...
What I'm really wanting now is to be able to get into the LG TV 'Menu' and be able to use the arrow keys and enter key on the MX-900 to pick and choose what I want so I can put the TV 'Magic Remote' away.