Hello...when i turn on the tv i have a sound..no picture.whats wrong?

It all depends what has led up to the problem, however if there has
been no indication of something going wrong,ie. picture getting dimmer, the most common fix is to reset.
First just check all cables are firmly connected. If that does not work then....
Unplug tv, disconnect from cable box, satellite box, any receivers.
Also turn power off to them as well.
Connect everything back and turn on.

Here is a video of other generic problems that can go wrong on any
tv that leads to sound with no picture.
TV Has Sound But No Picture Troubleshooting Guide

Just Contact Customer Care and get replaced

Hello Sirs, you need to publish the TV brand name & the model number.

The blinking light is the fault code to enable the engineer to have a good guess at where the fault area lies.
Count the blinks and tell a Sony repair shop, they will have a good idea of the cost.
Hope that helps.

Hello!

Please check the "troubleshooting" part of the manual to this TV. I hope it will help!

http://manualsbrain.com/en/manuals/796083/?page=27

our rca tv sounds like its turning on but doesnt

I have a sony codes for sony TVs that tell what is wrong by the blinks as soon as a can will ck it to see what it says.

hello it sound's like you have a power supply problem. need's to be replaced. "good luck"

major repair; requires 16 pin ic

Hello according to the symtom that you have describe I think that maybe you have activated the sleep function button on your tv and if this is not so maybe there is an internal problem on the main board of the tv.