No sound

When I connect my "Y" adapter to the back of my t.v. (red and white plugs), and then put the 3.5 mm jack into my boom box, no sound comes out of my boom box from the t.v. I have the boom box switched to aux and I have tried to go through all the settings on my Samsung t.v. but can not figure it out.
 
You have to connect the Y adapter to ports marked as "Audio Out" in your TV. Can you post some pic?
 
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