Youtube audio not going through my old surround sound system

Hi, I bought a Sanyo LCD TV and run audio through my surround sound system. SS is older and has no optical or HDMI inputs. When I watch tv I can hear the audio through my SS ok, but if I switch over to youtube, no audio. I've tried different things like getting an analog to digital converter, a digital to analog converter and no sound. It looks like the only option is a sound bar or a new surround sound system unless someone knows of a good solution?

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Clarification Request
There are hundreds of Sanyo models

So I can't tell you exactly what menu to look at. But you need to tell a little more. Such as the full link to the product and manual as well as how it's hooked up now.

What I look for are audio options in the YouTube app. Set that to stereo or speakers since an analog output rarely is beyond stereo.

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Sanyo tv

model is FW50C36F, Sanyo LCD TV (led backlight)
Manual at
Set up is this; wireless cable box, HDMI cable or optical from tv into cable box, red/white/yellow cables from cable box to surround sound receiver.
I have look in the youtube app but there is no option to set stereo or speakers.

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Remember I asked for the link.

I fussed around and think this is it. I don't know.

To save time and get to work, please give links.

Also, what is this about the "HDMI cable or optical"? Maybe and? Few TVs accept optical inputs so I'll check that out later.

Off to some errands and I subscribed so I'll get notice when you tell me that's it and what is that optical cable doing.

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Trying to clarify!

My tv has both a HDMI and optical inputs/outputs. HDMI from tv into cable box is what I use.
But I can use just an optical cable from tv to cable box.
And yes that is the tv! From your link I went to the page, clicked on download and lots of manuals come up. Mine is actually FW50C36F-B


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OK, this manual.

I don't see the make, model of the old stereo or surround system so I'm proceeding as if it's the usual stereo system with matrix for surround. That is, left and right.

1. The TV manual only shows Optical Output on page 16. Since the cable box is an output and the TV is an output, I"ll want to know what manual and page to sort out how that works.

2. I do see an analog audio output mentioned on page 8. It's the headphone jack which I could use for a cable from that to the usual Red/White (red is right, other is left) off to the usual sound system.
Test your YouTube to see if the headphone jack works with headphones. If it does not, you may have a defective product.

3. I see the FW50C36F has new firmware. Remember my view is always the latest and I never tell how to install as the maker has to be responsible for results.

So this clears it up a little but still wondering why the optical cable and we need a headphone for testing the 3.5mm jack function.

4. Page 30 shows a few sound options. Try setting the digital output to PCM and try TV speakers on/off.
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Youtube may not support 5.1
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YouTube does support 5.1

Now the big question is your YouTube and TV audio settings. But I digress.

Something truly odd about your OPTICAL CABLE ideas. While it's safe to connect an output to an output, it would only serve to confuse folk.

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