After scanning channels tv still does not have picture or sound

Sounds like you need to check if the tv is set to the right region.as BBC is region orientated.

Set the Channel scan for cable input, not antenna.

. Try putting you tv set to channel 3 or 4. Try your tv in all modes. Check the back also to see if in the right spots with the wires. Check your channel scan status, try it on anntena and try it on cable, run channel scan on both. good luck. Try vcr wires if cable wires dont work. vcr wires are yellow red and white. Try another cable cord sometimes they get old. Try looking at your remote and setting it to tv.

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.

Go to menu setting,Set it to auto scan chanel.

Possible that the sound settings are in different modes on the TV. So check to set after selecting the channels to the required sound frequency of your service provider.
If not you will need to reset once again the memory and do a search scan IN the AUTO mode for resetting the TV channels.

this is what i can tell you your tv has 2 boards a main one and a power supply one anything that has to do with your imputs tv, av, hdmi, etc has to do the main that includes the picture going off and sound you can contact the manufacturer and tv technicians, but the only place that its going to be cheap its at www.shopjimmy.com guaranteed

press a channel and power off WII.

There is some system reset to set the tv back to default settings. Also some boxes are picky and want the tv to be on chanel3 or 4 for the scan.

By saying that volume and picture controls work, do you mean you can access the TV's onscreen menu? If so, you may need to re-scan for available channels if you are using the TV's internal tuner. If the memory of those channels has been lost, the TV does not know where to "look" for a signal. You may also need to perform a power drain:

1. Unplug the product's power cable so that the device is not grounded to the house. Do not simply turn off the power-bar if one is in use.
2. Press and hold in the products power button for 1 minute to release the retained electricity from the capacitors and circuit board.
3. Plug the product back into the wall outlet rather than a power-bar to rule it out of contributing to the problem and turn the device back on. After this step, try the channel scan again if it didn't resolve the issue the first time.