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This tv isn't known for sound problems. First thing to do is to go to the cable box and push the volume up button on the box if there is one. Next thing to do is to try another device that has a hdmi output like a dvd or game system in place of the cable box. My guess is that this muffled sound is somehow caused by the cable converter box. You can try to reboot the box by unplugging the power for 30 seconds, then plugging it back in. If all else fails, you can call the cable or satellite service and have them change the converter box. Good luck, Russmann.
You may have overloaded your audio output with the external speakers(impedance or short wire problem?)as a result the audio out i.c maybe damaged which in turn may have blown one of several fuses in the power supply.maybe regular GMA type fuse or picofuses,you can try replacing blown fuse but if they blow right back you`ll need the help of a repairman
COULD BE, THE BEST WAY TO TEST IS, IF THERE IS A PROVISION FOR HEADPHONES THEN PLUG IT, IF YOU CAN HEAR SOUND, THEN ITS YOUR SPEAKERS, IF NO SOUND IN THIS APPLIED STEP.. COULD BE THE AUDIO OUTPUTS, OR FUSABLE RESITORS BLOWN, OR DRY JOITS ON YOUR AUDIO IC..CHECK OUT
when you loose sound in these set it can be one of three things. 1 the enternal speakers are blown. 2 go into setup and check to see the amplifer has been set to internal for the tv speakers external for speakers that you added. if still no sound then the likly cause is the audio aplifer chip to replace that you have to replace the main signal boad rother wise known as signal board. this board is one that a qualified rca tech has to do. he has specail equipment used to transfer data from the old to the new