TV Model MLT1921 audio is not in sync with video

It depends if this happens all the time, or on certain channels, or just on a digital TV, or in certain weather conditions. The audio and video are different data streams that have to synchronize. If your antenna blows in the wind, you could have the video lose sync and take a fraction of a second to get its act together, and by then the audio is on the next word. Some local broadcasts have intermittent sync problems. Sometimes just flipping between channels gets it back in sync.

I have some bad new if you go to google and type in "Motorola DCH3416 lagging audio" you will see this is a common issue with the lag being upward of 10 to 60 seconds. No solution at this time has been found.

There could be a few different problems. You should first narrow down the possibilities. If you are playing the mp4 file directly from your laptop try changing the source. Put the mp4 on a usb drive or on a playstation/xbox or simply on a dvd. Try playing the file through one of these other sources. If the audio no longer lags behind the video than its likely an encoder setting that your Hisense doesn't handle well. If lagging is still present on all your sources then change the type of cable. If you are using HDMI try RCA or vice versa. You can also separate the audio from the video. Try using a VGA cable between your laptop and TV for the video and use a separate RCA to 3.5mm headphone jack for the audio, Most Flatscreen TVs have dedicated audio inputs for different video inputs. Try out these different set ups and you can determine if the problem is with the TV the Laptop or the cables in between. If it is the TV you may have a problem with the main board but this is unlikely especially if the audio video sync works fine with other file types.

Im looking for a remote with the 3D option that will work with my 3D tv LY 55N800

Lip Sync issues are the nature of the beast. The TV has to process the digital video bitstream a lot more than the receiver has to process the audio so the result can be a gradual lagging of the video behind the sound...

http://en.wikipedia.org/wiki/Lip_sync

Some receivers have a sound delay control which you can use to try to sync them up. You didn't name yours so one does not know. I don't think this unit has that function. Look in the manual.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Pioneer-VSX-517-S-Receivers-manual/id/2526bh740/t/2/

I am using my tv as a second monitor as well, and i believe the lag problems with the monitor are due to the video/graphics card. I am not expert, but my pc is an alienware aurora with quad processors and 6gigs of ram. The only thing not top of the line is my video card, plus it gets slightly pixelated due to resolution not being sufficient from my video card. Otherwise flight sim X runs smoothly, except for the mouse lag issue. Best of luck, if your program is lagging also though, might be your driver

Check to see if your audio source is set to SAP. This stands for secondary audio program. For example, some stations broadcast english and spanish. Some stations broadcast english and nothing. If you are on a channel that broadcasts english and nothing, and you are SAP setting, you will hear nothing.

reprogram the tv- auto scan will synch video and audio

Usually the video lags behind the audio. The reason is the video, in many TVs, takes longer to process than the audio coming direct from the device. To solve this, the audio needs to be delayed. This can be done by 1. Using the tv audio output. Most TVs sync the audio to the picture and this 'synced' audio is available at the output jack of the tv. 2. Delay the audio coming out of the device. Many home receivers have a 'Lipsync' feature designed for this issue. The setting is usually between 50 to 500 milliseconds of delay, depending on the TVs video processing time.
I hope this is clear and can help.

Turn the volume on the TV all the way down. Its becasuse you have the sound come from both sources. its kinda fun to play with.