Sharp LC-42SV49U tv no sound

SOURCE: HDMI audio problems with my sharp LC42D64U

the problem is that your cable box is putting out too low of a bandwidth to your tv and is cutting out completely. Since its all digital either its there or not. try switching to componant cables. Cable boxes only support up to 720p anyway so you wont sacrafice any quality.

Hope this helps

SOURCE: Audio Problems with Sharp Aquos T. V.

I called Cox Communications and the technician told me to disconnect every cable or connection and turn the DVR and T.V. off. Cox ran a diagnostic check to make sure my DVR was reading proper info from their center. It was, and then I reconnected everyhing, cables, HDMI plugs, and finally turned the DVR on. It read Boot, and then, I waited for the time to show. When it did, I turn the T.V. on. It has worked great since then. No problems with sound or picture. Hope this helps someone.

SOURCE: Sound problem with Sharp LC-32D4U

I'm having the same issues

SOURCE: Sharp Aquos LC-46d65U HDMI connect

First off a little tip that manufacturers don't tell you is that you HAVE to TURN OFF the POWER to ANY UNITS that you are Connecting to via HDMI!!!!!!! If not you can short out the Inputs!!!!!!!! HDMI is usually Automatic, But sometimes you need to go into the Menus on all Devices to the HDMI section and write down their settings and compare them. Any definition that you are not sure of check the Manual or Google it! Match all the Settings (there won't be Much!) Hopefully the Inputs were not Damaged it only takes one time to short it out and then the Repairman makes a few bucks! Good Luck!

SOURCE: LG 42PX4DV - HDMI Audio / PC Audio IN problem

one quick fix you can try. plug in the HDMI cable, slect a digital audio sound output from the sound settings on your machine, then leave it connected and restart it. It just might work.