Ensure that your TV isn't muted, and go into the TV settings to ensure that sound is set to go through the proper channel (HDMI/RCA). If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. ROKU, the ROKU Logo, ROKU TV, ROKU POWERED, "Streaming Stick," "HAPPY STREAMING" and "NOW THIS IS TV" are trademarks and/or registered trademarks of Roku, Inc. in the United States. 2. By using our site, you agree to our. From there, you can change the TV output to match the proper HDMI connection. From there, you can change the TV output to match the proper HDMI connection. 3. !function(a){var e="https://s.go-mpulse.net/boomerang/",t="addEventListener";if("False"=="True")a.BOOMR_config=a.BOOMR_config||{},a.BOOMR_config.PageParams=a.BOOMR_config.PageParams||{},a.BOOMR_config.PageParams.pci=!0,e="https://s2.go-mpulse.net/boomerang/";if(window.BOOMR_API_key="8ZKNB-L7R9X-J5VUX-ZKLUE-H2UQX",function(){function n(e){a.BOOMR_onload=e&&e.timeStamp||(new Date).getTime()}if(!a.BOOMR||!a.BOOMR.version&&!a.BOOMR.snippetExecuted){a.BOOMR=a.BOOMR||{},a.BOOMR.snippetExecuted=!0;var i,_,o,r=document.createElement("iframe");if(a[t])a[t]("load",n,!1);else if(a.attachEvent)a.attachEvent("onload",n);r.src="javascript:void(0)",r.title="",r.role="presentation",(r.frameElement||r).style.cssText="width:0;height:0;border:0;display:none;",o=document.getElementsByTagName("script")[0],o.parentNode.insertBefore(r,o);try{_=r.contentWindow.document}catch(O){i=document.domain,r.src="javascript:var d=document.open();d.domain='"+i+"';void(0);",_=r.contentWindow.document}_.open()._l=function(){var a=this.createElement("script");if(i)this.domain=i;a.id="boomr-if-as",a.src=e+"8ZKNB-L7R9X-J5VUX-ZKLUE-H2UQX",BOOMR_lstart=(new Date).getTime(),this.body.appendChild(a)},_.write(" License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a>
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/ed\/Hook-Up-a-Comcast-Cable-Box-Step-2-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-2-Version-2.jpg","bigUrl":"\/images\/thumb\/e\/ed\/Hook-Up-a-Comcast-Cable-Box-Step-2-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-2-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/88\/Hook-Up-a-Comcast-Cable-Box-Step-3-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-3-Version-2.jpg","bigUrl":"\/images\/thumb\/8\/88\/Hook-Up-a-Comcast-Cable-Box-Step-3-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-3-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e3\/Hook-Up-a-Comcast-Cable-Box-Step-4-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-4-Version-2.jpg","bigUrl":"\/images\/thumb\/e\/e3\/Hook-Up-a-Comcast-Cable-Box-Step-4-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-4-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d9\/Hook-Up-a-Comcast-Cable-Box-Step-5-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-5-Version-2.jpg","bigUrl":"\/images\/thumb\/d\/d9\/Hook-Up-a-Comcast-Cable-Box-Step-5-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-5-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/b\/b9\/Hook-Up-a-Comcast-Cable-Box-Step-6-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-6-Version-2.jpg","bigUrl":"\/images\/thumb\/b\/b9\/Hook-Up-a-Comcast-Cable-Box-Step-6-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-6-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/eb\/Hook-Up-a-Comcast-Cable-Box-Step-7-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-7-Version-2.jpg","bigUrl":"\/images\/thumb\/e\/eb\/Hook-Up-a-Comcast-Cable-Box-Step-7-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-7-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/a\/ad\/Hook-Up-a-Comcast-Cable-Box-Step-8-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-8-Version-2.jpg","bigUrl":"\/images\/thumb\/a\/ad\/Hook-Up-a-Comcast-Cable-Box-Step-8-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-8-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/db\/Hook-Up-a-Comcast-Cable-Box-Step-9-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-9-Version-2.jpg","bigUrl":"\/images\/thumb\/d\/db\/Hook-Up-a-Comcast-Cable-Box-Step-9-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-9-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/9\/9a\/Hook-Up-a-Comcast-Cable-Box-Step-10-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-10-Version-2.jpg","bigUrl":"\/images\/thumb\/9\/9a\/Hook-Up-a-Comcast-Cable-Box-Step-10-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-10-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/50\/Hook-Up-a-Comcast-Cable-Box-Step-11-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-11-Version-2.jpg","bigUrl":"\/images\/thumb\/5\/50\/Hook-Up-a-Comcast-Cable-Box-Step-11-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-11-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/2e\/Hook-Up-a-Comcast-Cable-Box-Step-12-Version-2.jpg\/v4-460px-Hook-Up-a-Comcast-Cable-Box-Step-12-Version-2.jpg","bigUrl":"\/images\/thumb\/2\/2e\/Hook-Up-a-Comcast-Cable-Box-Step-12-Version-2.jpg\/aid4063717-v4-728px-Hook-Up-a-Comcast-Cable-Box-Step-12-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"