Bought a vizio 3 months ago. hate the sound it is very tinny.is there a solution? have tried all the settins & they don't seem to change that much. Can I add some sort of speakers?

Hi, it seems you have a faulty mainboard, but the better and more secure option to avoid spending money unnecessary it's to contact directly to Vizio technical support:
Email: [email protected]
Tel: (877) 698-4946 Fax: (949) 585-9563
Hours of operation: Monday - Friday: 6 am to 9 pm
Saturday - Sunday: 8 am to 4 pm
Please have your VIZIO model number, serial number, and date of purchase available before you call.

Sounds like you had a high voltage power surge just before going out
Are u using a high grade reference center or surge stage 2 or 3?

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It is under warranty, I would take it back and ask for exchange, bad sign that it goes out in less tahn 30 days.

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

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change the ear piece speaker.i problem still exits change strip at your nearest service centre.

Vizio Tvs have a problem.. mine does the same thing almost. turns on off about 20 times before it will turn on and stay on..

This happened to a client of mine coincidently the morning of the DTV change. Try checking the Menu and see if the Speakers are turned On or Off. They can do this for no reason.

Both of your problem amps were made in the '70's or earlier. It is entirely possible that the coupling capacitors are failing. This is an issue for a service center whether it is caps or something else, like failing tubes.

The good news is that installing metalized polypropelene capacitors will make those classic amps sound incredible.

try fixing its amps by simple reheating it. if still doesnt work try replacing its parts... it is certain that it has a prob on the amps.