I turned on my TV today to watch some youtube and I am not getting any sound from my surround speakers. I am getting sound only out of my subwoofer. I am using an optical cable to send the audio to my receiver, but when testing with hdmi cables I got the same result. When I open the speaker manual setup in the receiver menu I can hear the test sounds for all of my speakers.
Try connecting the PS4 directly to the receiver with HDMI.
That will tell you if the problem is the TV or the receiver. Make sure to set up the input you use and adjust the surround mode for that input as well.