Distortion sound from audio - Toshiba REGZA 42 in. Flat-Panel LCD HDTV

Adjust the preamplifier level to approx. 9-12o'clock on the input trim.

Then adjust the master level to the desired output.

More about proper gain stages HERE:

http://www.homebrewaudio.com/what-are-gain-stages-in-audio-recording-and-live-sound/

First of all take the Audio output from the LINE OUTPUT and connect to an external amplifier. If the sound is still not clear then it is possible that the fault is in the SIF section provided this is the sound distortion from a Tv program/cable program. If this is a DVD or DTH input then the distortion can be from these input units. So please confirm on them.
If the sound does not have distortion then the fault is in the OUTPUT of the audio amplifier in the TV, Possible the output IC or the coupling capacitor are defective.

Well... It consumes 240 watts of electrical power total so take the audio power specifications with a huge grain of salt, as no audio device puts out in audio power anywhere near what it consumes in electrical power. Heat produced is power consumed, too and nothing is 100% efficient.

In the specs below the only information useful for comparison is in the line I highlighted with >>> <<<<'s as it conforms the closest to the industry standard practice of using:

"X watts into 8 ohms (standard load) from 20 - 20000 hz plus or minus Y db at no more than .0Z% distortion"

The better amps specify vanishingly low distortion specs (0.0x% vs 0.x%) at the cost of being able to claim higher wattage. But they guarantee cleaner sound at the claimed levels.

JVC is being tricky with their choice of a 40 hz lower limit. THAT is the power hungry end of the spectrum. 20 hz is normally the lower limit stated.

"Output Power .............At Stereo operation
Front channels .............55 watts per channel, min. RMS, driven into 4 ohms at 1 kHz, with no more than 0.9 % total harmonic distortion. (IEC268-3/DIN) 30 watts per channel, min. RMS, driven into 8 ohms at 1 kHz, with no more than 0.9 % total harmonic distortion. (IEC268-3/DIN)

>>>>> 30 watts per channel, min. RMS, driven into 8 ohms, 40 Hz to 20 kHz, with no more than 0.8 % total harmonic distortion. <<<<<

At Surround operation
Front channels .............50 watts per channel, min. RMS, driven into 8 ohms at 1 kHz, with no more than 0.8 % total harmonic distortion.

Center channel .............50 watts, min. RMS, driven into 8 ohms at 1 kHz, with no more than 0.8 % total harmonic distortion.

Rear channel .................50 watts, min. RMS, driven into 8 ohms at 1kHz, with no more than 0.8 % total harmonic distortion."

download kazza lite codecs for your videos and update your sound drivers from windows update.

go to control panel click sounds, speech audio devices, then sounds and audio devices.click audio. choose if you are using usb jack or the realtek hd audio output....

check your buffer speeds. take them from the highest and lowest on sample rates. make sure your ram fits the bill.

is it realtek high def audio

its the audio amp, its fried and needs to be replaced. match the numbers up and purchase/replace boards, this will solve your problem.

YOU SHOULD NOT PLAY CD,S IN SURROUND SOUND,SWITCH TO STEREO ONLY FOR CD,S AND OTHER MUSIC SOURCES.
HOPE THIS HELPS.