Can't Turn On SRS Tru Surround XT On My LG 42LH7000.

with a mini hdmi to hdmi or rca to 3.5mm plugs

THIS AUDIO PROBLEM PERTAINS A FEW DIFFERENT NAME BRANDS AND TO MOST VIZIO Tv MODELS
MADE IN THE LAST 2-3 YEARS MAYBE EVEN 4+ I'M NOT SURE
WHEN IT STARTED.
I do believe your model is equipped with the SRS features which IS a formatted audio enhancement . Anyway go into the advanced audio settings in Tv's menu and TURN OFF the SRS tru volume leveling & the SRS tru surround feature. Additionally in the Tv's menu also has an option to turn off the internal speakers. And another common pitfall that I see happening to people. Is check the PCM and or LPCM option in both your Tv & your cable/satellite box's audio menu setup/settings. LPCM is Limited Digital Audio and PCM is Variable Digital Audio (VOLUME AMPLIFICATION) but
because it is a digital signal the two formats conflict, and the audio
will in and out.
THIS AUDIO PROBLEM PERTAINS A FEW DIFFERENT NAME BRANDS AND TO MOST VIZIO Tv MODELS
MADE IN THE LAST 2-3 YEARS MAYBE EVEN 4+ I'M NOT SURE
WHEN IT STARTED.
P.S. YOUR WELCOME I SAY THAT CAUSE QUITE OFTEN IT IS
THE AUDIO PROBLEM VIZIO CUSTOMERS ARE HAVING!!!
Jason Draimen AKA "AVALANCHE" !!!

Try going into menu-sound and enabling external speakers. I am not sure if this option is available. How is tv connected to your surround sound receiver? If it is component cable, try plugging them into the back of your surround sound receiver where the tv input is labeled. Then turn on your receiver and select tv from the mode button.

Most people would have a hard time finding that manual because it's not a 40456 it's a 40A456
Your manual is located here:
http://downloadcenter.samsung.com/content/UM/200803/20080322095034640_BN68-01424A-00L08-0305.pdf
Have a wonderful day!

42PG20 Connections

• Connector Type
  
• 1 x Composite video/audio input ( RCA phono x 3 ) - Rear ,
  
• 1 x S-Video input ( 4 pin mini-DIN ) -
• Rear , 1 x Digital audio output (optical) ( TOSLINK ) - Rear ,
• 1 x Remote control ( Mini-phone 3.5 mm ) - Rear ,
  
• 1 x Serial ( 9 pin D-Sub ) - Rear ,
  
• 2 x Component video input ( RCA phono x 3 ) - Rear ,
  
• 2 x Audio line-in ( RCA phono x 2 ) - Rear ,
  
• 2 x HDMI input ( 19 pin HDMI Type A ) - Rear ,
  
• 1 x VGA input ( 15 pin HD D-Sub (HD-15) ) - Rear ,
  
• 1 x Audio line-in ( Mini-phone stereo 3.5 mm ) - Rear ,
  
• 1 x Composite video/audio input ( RCA phono x 3 ) - Side ,
  
• 1 x HDMI input ( 19 pin HDMI Type A ) - Side

42PG20 Audio System

• Sound Output Mode Stereo
• Surround Mode Yes
• Sound Effects SRS TruSurround XT
• Audio Controls Bass , Treble , Balance , Sound mode
• Speakers Included 2 speakers
• Output Power / Total 20 Watt
• Additional Features Auto volume adjustment
• Speaker(s) 2 x Right/left channel speaker - Built-in - 10 Watt

Hello,hd is for video only so the answer is no,however there is a newer surround sound available for blu ray called dolby tru hd,alas your system isnt dolby true hd however dolby digital (which you have) still sounds excellent.

Well depending on what kind of tv or reviecer you have ,,,if you using standard rca jacks,,red,yellow,white,,,,the hook to reciever to tv ,,or availble input,,should be a place on the tv that just has the red and white by itself ,,hook there,,but tru surround sound is digital,,either a optical cable or hdmi,,depending on your gear,,but tv doeant run surround ,,really,,but dvd,,or blu ray like that does,,k good luck,,

link your optical cable from your HD box to your surround sound.
Then if you go into your HD services menu, press 4 then go to sound make sure its set to Dobly D
That should sort your problem out

Cheers

Little Dish Fitter

How can I get surround sound to work on my tv. When I pull up my menu and go to audio the SRS Trusurround XT is not in bold so I cant figure how to connect it so I can have the surround sound coming from the system and not from the tv. Please help.