I have a 2007 Sony KDL 52xbr4. The sound stopped working. No sound when using the speakers, and no sound when using the output to audio system. Which board controls the sound output on this unit?

SOURCE: Please help with getting 5.1 sound from my TV!

You must run a Digital Optical cable from your PS3 to your reciever. Then press your function button on your recievers remote until you see SAT/CABLE on your recievers display. Next go to your PS3 settings and go to Sound settings, then Audio Output settings, and select Digital out (OPTICAL) then your done. This is the only way to get true digital sound from your PS3 to your reciever.

SOURCE: Sony center speaker and rear speakers don't work all the time

try using another speaker for the center channel and the left speaker, also watch your ohm load, most of the want a 4 ohm load. try to narrow it down to see if it is the speaker or the amp.

SOURCE: DAV-DZ260 + KDL-32V4000 - no audio from TV to DAV via HDMI

Check DAV amp menu and select DTS surround or any other digital sound option.

SOURCE: Sony BRAVIA volume problem

I had this same issue, and solved it by putting the TV in "Theater Mode', which can be acheived by hitting the "Theater" button on the remote.

SOURCE: Have a sony KDL - 46v5100 volume problem

Tap the "Theater" button on the remote. You should see either "Theater Mode: On" or "Theater Mode: Off". If it is off, tap it again to turn it on and wait for it to go away. Now tap again (should say "Theater Mode: On") and then press and hold it for about a second. This should actually turn it off, as opposed to just pretending to. Works on my larger Sony KDL.