I have the same cheap Jenson. It will not work. If you plug in a HDMI cord in the front on the JWM22 then to the back of the TV, I heard it will work but that hanging cord looks stupid. Buy a sound bar, forget the Jenson or buy another stereo to put in there. I have talked to Jenson and Alliance, it won't work and its not designed to.Unless I have totally missed a button somewhere my Jensen JWM22 does not have a MODE button. The only button I have close to what is being described is one with only two options - HMDI In / AUX. Putting TV in HDMI ARC mode then ensuring I have Jensen speaker A (that is the one internal for my unit) on and volume to about 15-20 does not give me any TV sound thru the Jensen. I'm thinking I got an alternate unit compared to what others may have. Not happy that I cannot get sound from TV thru Jensen stereo. That was one of the things we liked when we decided on our 310RL. Still working on it however...
Tried it. No volume. TV was changed and connected via bluetooth but not volume. I gave up. I'll by a sound bar and change out TV to out other LG.I have that same smaller jensen in my 310RL - I was able to connect the TV via bluetooth to the stereo head unit and play the audio through the speakers that way. It didn't really buy much in my opinion - i.e. didn't make the sound dramatically better so I quit doing it. On the TV settings, you can change the output from the TV speakers to a bluetooth device. It wasn't too difficult as I recall.