Great picture, no sound. The remote isn't working even with new batteries. The screen says Stereo SAP A003. I have read that the SAP could be my problem. Is there anyway for me to change it manually?

if just running HDMI cable try adding audio cables too, check all your volume and mute settings in the system setup.
If you have audio on most channels, but have silence on some or all of your local network channels, you may have the Secondary Audio Programming (SAP) turned ON. Complete the following steps to turn off SAP.

1. Press the Settings or MENU button on the digital remote.
   
   Result: The Settings screen displays.
2. Choose from the following options.

If... Then... Disable SAPdisplays Press the Select button. Choose SAP Languagedisplays Use the left or right arrow buttons to choose the English setting and press Select. PREFERENCESdisplays Scroll to the Language option, select Audio, then select the option labeled Primary or the one labeled English. If the above quick fix doesn't work, there may be a problem with MTS, Stereo, or another SAP issue. Try the following:

• Verify in the program listing guide that the program has MTS, Stereo, or SAP features.
• Check to see if the MTS, STEREO or SAP light on the TV or VCR is on.

If the light is not on, try the following:

• Push the MTS, STEREO, or SAP button on the TV or VCR.
• Adjust the fine tuning on the TV set to restore the stereo or SAP.

http://www.cox.com/residential/support/tv/article.cox?articleId=81da8760-5c47-11df-ed4d-000000000000

first check the speaker setting in the menu see if the speaker is selected ON. if the speaker is on then check the SAP function of the set. check this with the remote with the MTS button on the remote. keep hitting the button untill the word stereo appears.

Hello; This model does have built in speakers just below the screen. If you don't have sound, make sure the sound is not muted and that SAP has not been selected in the audio mode on the remote control. Read/ download the owner's manual for best info. If still no audio, you have a failed circuit board. John

Hello
Press the MTS on the remote control handset to select STEREO, MONO or SAP. All the options will be available only when the current TV channel is broadcasting that option. Channels will not always carry programes, that have all MTS options. If "STEREO" appears on the screen when you select a channel means stereo sound is available with current programme. You can hear sound from both speakers. If broadcast is not strong and clear, stereo sound will not be available. Press "MTS" button to change it to "Mono". This will eliminate the noise. If "MONO" appears on the screen when you select a channel, stereo effect will not be availabe, even though you have set it to stereo. If "SAP" appears when you select a channel 'Second Audio Programe' [SAP] broadcasting is available for that programme. Press the "MTS" button to 'SAP' and you can hear that programe in different language or some other kind of audio.

Your SAP/MTS function is most likely turned on. This feature has 3 modes: Stereo, Mono and SAP. Stereo and Mono are easy to understand, it's the SAP that can get you. SAP stands for Second Audio Production. It is used to provide weather, information or an additional language translation of a program. Some broadcasters simply transmit the mono audio over the SAP audio channel when the are not using it for other purposes. Other broadcasters simply do not use it, which does not give you any audio. Look on your remote for a SAP or MTS button. If you do not see one, look in your TV user menu for this feature. If you are using a cable box, look in the audio menu of the cable box. You are looking for something set to SAP... just change it to STEREO. I hope this was helpful.

If you have lost sound on only one station and are using cable or an antenna directly to the TV. Look in the audio settings as most likely the SAP mode is turned on. If the TV detects a SAP signal even if there is no audio this is what you will end up with.

Apparently the TVGOS (TV Guide On Screen) signal on CBS stations (since the 6/12/09 digital changeover) can cause the sound to be missing on those channels. Use the SAP button on the remote to page through the SAP options. When you return to the normal setting the sound will be restored. This problem should not occur again unless the SAP button is pressed.

if you are using a digital TV is is possible that the frequency is slightly out or you have poor reception.
do a new channel serch first (automatic if you can
and see what happens
sap may reset also if you do this function.

There might be a SAP button on the remote or under a cover on the remote, or it might be an audio button, you want Main or Stereo. I couldnt pull up a picture of the remote, but I would suspect that if the SAP function is not in the menu it is probably on the remote.

Instead of explaining the SAP/Stereo function to you, the easiest way to get the TV back to normal is while the set is on press the ACTION and POWER buttons at the same time and hold them until the CHK screen appears. Once that does release the buttons and then press the action button again to exit the CHK screen. Your TV is now back to the factory settings and will need to have the channels programmed again. By the way the SAP/STEREO button on the remote should be near the upper left hand corner of the remote itself.