Thanks for the reply.
Unfortunately there isn't a quick fix for this problem, and it does require service. The clicking sound 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 $175 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.
The replacement of the board is very simple if you'd like to do this yourself. It can be purchased at the link below for $60 and change, and all that's needed for this repair is a screwdriver:
If you're not comfortable with this type of repair, then if you'd like you can locate a tech at the link below:
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