Sound turns off after tv is started sound only one

I'd look at bad LED backlights

I have a sony bravia kdl 40v 5100 for less than two years and i did not purchased an extended warranty and now my tv is down.
I have no picture, no sound just a black screen when i turn the power on, the power (green) light is lite up and the tv turns off by itself for like less than 30 seconds. I have tried to press as many buttons on the remote control and on the side of the TV to get any message but nothing seem to happen. Any suggestions and solutions? Thanks

I had the same issue with my sony kdl40ex500. All I did was update the firmware and it fixed it. You can get the update at the SONY website for free.

I'm sorry, but you can't. They are like most (not all) Samsung models with the start up chime. It's built into the software. I will be speaking with a Sony Rep this week and will ask him if they have an answer to this issue. If I find they do I will post it on google. Just type "Its Sony Chime"

HI MAIN BOARD OF THE LED IS DEFECTIVE MEAN AUDIO SECTION GOT SOME PROBLUM PLEASE REPLACE MAIN BOARD
THANKS
M NASIR

try turning off all auto updates in the digital menu settings then advavce settings

You need the Inverter Board.

I off my TV and remain it off 4 the whole night in the morning when my husband on in from a main switch it started working properly with no problem. A thanks alot for your replay.
Mrs Saimazeb

Replace the BU Mount pcb. Sometimes they are called the FB pcb.

ACTUALLY WITHOUT SEEING YOUR PROBLEM PHYSICALLY I CANN'T SAY ANY THINK, BUT FOR YOUR KNOWLEDGE LET ME TELL YOU NO TV MAKES ANY KIND OF SOUND DURING SHUT OFF. & you are saying for more than 30sec, i think you should call the SONY TECHNICIAN for visit.