I have to connect my TV to my cisco cable box with YBR (don't ask). I have an older Sony Surround Sound home theater system, b

Solution
There is no reason you need to connect the component video output to the Sony.
Connect it directly to the TV.
You can connect the audio output of the box to the Sony or connect the audio output of the TV to the Sony.
Depends on what connections you have available on the TV, cable box, and HTS.
There is no reason you need to connect the component video output to the Sony.
Connect it directly to the TV.
You can connect the audio output of the box to the Sony or connect the audio output of the TV to the Sony.
Depends on what connections you have available on the TV, cable box, and HTS.
 
Solution