No video on tv monitor

Yes...the yellow cable is your video feed. Connect that and you will have video again.

When you plug the AV cables into the receiver make sure that the channel that it is plugged into is selected on the front of the receiver. Also note that the receiver should have a monitor output that should be plugged into the TV and the TV input must be selected on the TV.

HI
IN THIS CASE YOU LED TV CHANG AUDIO FORMATE PLEASE GO TO TUNING SECTION THEN IN FINE TUNING AND THERE IS SOUND OPTIOND LIKE BG DK I AND M SELECT ONE ACCORDING TO YOUR COUNTRY
THANKS
M NASIR

This sounds like a common problem on these TVs (it's happened to both of my AOC TVs a couple times). Try a factory reset:

1. Press and hold "Menu" and "Channel+" on the TV. (do not use the remote)
2. Using the other hand, press the Power button.
3. A small screen should appear in the top left part of the screen.
4. Using the remote, select "Memory Recall" and Enter.
5. Power off and reboot the TV and Computer.
6. Run channel auto-scan to regain the picture.

This television must have the ability to broadcast channels in SAP. Look for an SAP or MTS or AUDIO button on your Sylvania remote. The audio menu might be the place to find this setting as well. You want to remove the SAP and have the tv in either mono or stereo.

Red = right sound channel, white = left sound channel and yellow = video (picture) channel. if you have the connections matching these on the tv, then there should be an AV channel on the remote/tv control panel. Select this channel to view, if more than one AV channel on the tv, there will be a number next to the sockets you plugged into. Select the AV number and away you go.
If your tv doesn't have the correct sockets you can buy a converter to use the ariel socket on the tv.

To get back sound channels ect just select the channel in question press menu, 
select installation, select manual scan, click ok on down frequency. 
It'll now scan for channels when its finished exit back to normal 
tv viewing screen go to the end of your channel listing and the desired channel will be there with sound. 
This can be done on any channel with no sound by just selecting that channel following the instructions above. 
Hope this helps 

On WMP - go to Tools > Options > Devices > Select Speakers > click Properties > Audio Device to Use - ensure you select your audio Card (Not direct sound - just a precaution) > Advanced > Volume Tab > Speaker settings click on Advanced > Select the type of Speakers you have. - Hope this helps, let me know!

TV SETTING
1. Press the MENU button.
2. Use or button to select the TV setting menu, then press or button.
3. Use or button to select the Channel no. setting and use the or button
to change from AIR (over-the-air broadcasts) to CABLE (cable/satellite broadcasts).
4. Use or button to select the Tuning mode and use the or button.
5. Use or button to select the Auto tune and press or button to
confirm the selection. The unit will immediately search through all possible TV
channels and store those channels with signals in memory. After this is complete,
the unit will switch to the first channel found.
6. To exit the MAIN MENU and return to the normal screen, press the EXIT button.
Note : In DVD mode, this option is not available.
Remarks:
1. Channel no. : 2-69 channel for Air mode, 1-125 channel for Cable mode.
2. Tuning mode : Air or Cable mode are available.
3. Auto tune : Searches for usable stations and stores them in memory.
4. Skip : ON - Skip weak channels. OFF - No channel skip.
5. Fine tune : The frequency changes to allow fine tuning.
6. AFC : Auto frequency control.
7. MTS : Select the Mono sound/Stereo sound/Secondary Audio Program (SAP).
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TV SETUP
MTS (Multi-channel Television Sound) SETTING
This feature allows reception of sound other than the main audio for the program.
1. Press the MENU button.
2. Use or button to select the TV setting menu, then press or button.
3. Use or button to select MTS menu, and press or button to select the
options (Mono, Stereo, SAP)
4. To exit the MAIN MENU and return to the normal screen, press the EXIT button
on remote control.
Note:
• MTS only operates while in TV mode.
• The SAP (Secondary Audio Programs) feature allows a TV station to broadcast
other information, which could be audio in another language.
RESTORE SETTING
If you reset the TV to the factory settings, all your present settings on picture &
sound will be erased and replaced by the factory’s default settings. However, picture
setting in PC mode and parental setting will not be erased.

in some cases certain manufacturers say in the instructions that when using s video with seperate audio, you cannot use the HDMI for the sound and sometimes visa versa, it's just the way the output is set up. Remove the other sound cable you are using for pc or tv and just use HDMI to confirm that the sound is re-enabled on the HDMI