Facing TV Problems? Ask a TV Technician.
Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.
HDMI will not work here, the tv is too old to support that.
However you can keep the existing connections on the tv and simply add an optical connection: http://amzn.to/2j51MxJ
from the tv to the sonos.
This is plugged to the Digital Audio Out port on the back of the tv (just to the left of the antenna connection)
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Yes exactly, the tv has hdmi but it does not support the AUDIO RETURN CHANNEL (ARC) function necessary to work with the soundbar, but the optical connection will work fine.
There is nothing to be gained by using a splitter (it wouldn't work in the first place).