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Audio and Video out of Sync

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Old 10-10-2010, 09:22 AM   #1
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Default Audio and Video out of Sync

New to this site and a NOVICE in electronics so please excuse my ignorance. My old tv was DVI so I had DVI cable from my satellite receiver and RCA cables from my satellite to my surround sound, no audio was hooked to my TV. Worked great for 6 years. New TV is HDMI, so I ran the HDMI to the TV and left the RCA direct from my satellite to the surround sound. Turned down the TV but my audio in the surround sound is a split second ahead of my video. I had no audio cable running from the TV to surround as i mentioned earlier, just from satellite to surround. Only audio output on TV is Digital Audio Output requiring a Optical cable that I do not have, and a small headphone type jack, not exactly sure what the technical name is. I hooked a cable to that small headphone style jack in the TV that had RCA jacks on the other end and went to the surround sound with it, and that solved my problem.

2 questions. Why did my audio get ahead of my video with my original configuration and is there any way to correct it?

Is the mini jack I am using now any good or would I be better served with the Optical Fiber cable? Thx
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Old 10-10-2010, 02:44 PM   #2
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The problem is the video processing that occurs in the new flat screens. That is what is delaying your video. Many surround systems have a delay setting to compensate for this, so you might look for that.

Yes if you attach the audio output of your TV to the surround system it will fix the delay problem since the TV is designed to sync the audio and video. Many of the new flat panels don't have RCA stereo audio outputs anymore, but opt for optical audio outputs only. If your surround system will accommodate an optical cable, it would be a better way to go since it will deliver 5.1 from the internal tuner (maybe other inputs as well) to your surround system.
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Old 10-10-2010, 03:47 PM   #3
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Thanks for you help. Your right on about the new TV and no RCA outputs. The surround does support optical audio, so I will have to look into that.
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Old 10-11-2010, 11:07 AM   #4
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Quote:
Originally Posted by karter25 View Post
Thanks for you help. Your right on about the new TV and no RCA outputs. The surround does support optical audio, so I will have to look into that.
The optical cable would be your best bet. I'd recommend getting it from monoprice.com: http://www.monoprice.com/products/se...+cable&x=0&y=0
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Old 10-11-2010, 02:34 PM   #5
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Quote:
Originally Posted by rbinck View Post
The problem is the video processing that occurs in the new flat screens. That is what is delaying your video. Many surround systems have a delay setting to compensate for this, so you might look for that.

Yes if you attach the audio output of your TV to the surround system it will fix the delay problem since the TV is designed to sync the audio and video. Many of the new flat panels don't have RCA stereo audio outputs anymore, but opt for optical audio outputs only. If your surround system will accommodate an optical cable, it would be a better way to go since it will deliver 5.1 from the internal tuner (maybe other inputs as well) to your surround system.
Rbinck is correct that "some" TVs will send HDMI audio out of the optical out on the TV, but this is rare. Usually this will only work when you have an OTA (over the Air) antenna using the internal tuner for this, or possibly with a direct cable from a cable box using the TV's internal QAM tuner. Most TVs do NOT work with HDMI source inputs so this likely will not solve your problem and you would lose audio trying this but it is worth a shot.

If your receiver does not have a lip-sync adjustment (that would likely have to be adjusted for each channel to some degree), then it will be tough to correct this without much hassle whenever you change the channel.

I would try turning off ALL video/audio "enhancements" to minimize any extra processing time and see if this helps. Besides, most of those "enhancements" just add artifacts anyway so we usually advice them all to be turned off anyway. If this doesn't work look for a game mode which many have to turn off even some processing that the user cannot control to avoid the video lag when gaming.

If none of this works, then I would return the TV and choose a different model/brand that does not have this issue.

FYI. In the future it is best to include more info like model/brand for all equipment being connected so that we have as much info as possible and to look up the manual online for them. Also which SAT company are you using as well.
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