RCA icon? Ok. Let me see ...Wait a minute...if you do have Speaker on/off...it might X out an RCA icon when the mute is pressed. But you don't have access to the Audio settings, even though I didn't see a speaker/reciever selection setting listed.
Connected to TV with HDMI Connections? AQUOS LINK control may be active, although I would think that would only be active when you're using the HDMI connections.
And...you would need a unit (DVD player, Separate Audio Soundbar, maybe even a Satellite box with HDMI CEC control and a HDMI 1.3a cable on it.
Anyways...RCA Jack implies "ye olde Analogue connections" not the futuristic HDMI connections...and I really need some feedback from you at this point in time.
1] All you did was unplug one set of connections...it shouldn't scramble or change the settings at all. However, TV's are computers (to an extent) and can lock up. To that end, I have to assume the best and worst case scenario.
Best case -- Whoops, hit the wrong button or was pressing the wrong button to access the audio menu. That's the one in the flip top lid.
Worst case -- Static electricity issue. Touched the connectors, pulled them out, a build up of static discharged...and we have to RESET the TV set.
These 3 pictures might help direct you. The Yellow is for the Best case scenario, you should try them FIRST, even if you did not flip that lid and use the option button.
Green....that's the RESET. Last option. If you hated waiting for the TV tuner to scan all channels...it's going to force you to do that. But it clears ALL glitches and ALL mis-set settings.
RCA icon? I'd only expect to see that on any of the NON HDMI video inputs, but it still doesn't explain why the AUDIO setting or the OPTION settings don't list it as Speaker on/off or Speaker/Audio out or Speaker/Reciever somewhere.
All I see is the Aquoslink Speaker on/off.
Here's the pictures.
Lastly...do this reset if the above doesn't restore audio to your speakers