Hello , my name is Jack Perhaps I can help you with this problem but first i would have a few questions;
Is this tv connected to a cable box/converter,satellite receiver,digital converter etc ?Do you have other equipment like a dvd,bluray,games etc. connected to this tv ?
If so , do they have the same problem ?
yes. cable. blue ray
Sorry but I`m having some problems with the computer and replying to you from a small tablet .
I will opt out and repost your question for other techs.
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O.k then and please do not reply to this otherwise the question will not be re-posted.
No sound on cable box and blu ray
Just blu ray. 1 1/2 years tops
Still no sound. with volume turned up no humming or buzzing
Repair and diagnosis estimate....LC70LE632U
Thanks for the reply. Unfortunately, the problem you're having indicates that the audio IC that drives the internal speakers has failed. It is common in these sets as they use very low powered amplifier IC's that generally heat up and fail. The IC is located on the mainboard, and requires the board be replaced. This type of repair is typically around $275 to replace the Mainboard. I wish I had better news, but there are no resets or buttons you can press to fix this problem and the set will require service. If you'd like you can locate a tech at the link below:
If you need further assistance, let me know.
If not, please do not forget to rate my answer.