Connect to cable box (At&T Uverse) - TCL 40FS4610R 40-Inch 1080p 120Hz Smart LED TV Roku TV

Is this a high def tv? Are you using an hdmi cable, component cable(red green & blue) or a low def coax cable to connect the tv? If coax, the tv needs to be on channel 3 or 4. If hdmi or component cable is used you need to change your input on the tv with your remote to the matching input you wired it to. The uverse stb (set top box) changes the actual channels once you have selected the correct input.

Try using component cables works just as good as HDMI

get a new one amd instage it and tell the manger that it is not working

Check all sources , ie cable box, dvd player or video game. If all have no sound check mute setting in menu or on remote. iI just cable box or sat receiver or evan att uverse box turn them of then back on. the uverse box you may have to remove power. If still no audio request service. The problem is likely the main board or speakers .

I would try connecting a dvd player to one of the HDMI input on the tv to be sure the tv is the problem.Try new HDMI cable 1.3 version. ATT uverse boxes are alway a source of problems and I would assume it was bad before I would condem the tv. If the tv is bad and it is under warranty an authorized servicer will replsce the main board.

try a banana

Use component cables instead of hdmi cables. I know this isn't the best solution, but HDCP is not used over component and the video quality is just about as good.

This can be done. The uverse cables have to be hooked through the vcr, which must be left on all the time. Then the VCR to the uverse receiver. It's basically the same hookup as through a cable box.

First of all, is your blue "HD" light lit up on the front of your Uverse box?

If yes, then you're in HD

If No, you need to check your connections from Box to TV
1.Those Red-Blue-Green cables are for video only, they don't carry sound and shouldn't be connected to audio outs. Audio needs a seperate cable. Make sure your Red isn't on the audio out which is also red. Make sure your blue and green aren't switched with each other either. Check that at both ends.
2. Try an HDMI cable. It will carry audio and video together and it's one cord instead of 5.
3. What brand/model of TV is it? Is it an older projection TV? The HD tuner might be shot. The individual color tubes commonly fail after a few years.
4. Are you selecting 720p or 1080i from your TV's menu or from the Uverse menu? You'll need to set it through the Uverse box, not the TV.
5.Follow -Menu -Settings -Aspect Ratio to change to 720 or 1080. This should start an autotest which will scramble your picture for about 5 seconds, then bring you back to a menu asking you to keep settings or revert back settings. If you never see that question pop up, then your TV isn't supporting the HD, and you settings will be rolled back automatically. If the question does pop up and you can read it, select "keep settings" and press OK. Your blue HD light should come on the front of the box now.