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Vizio M550SV no sound. Is there an audio card or does the main board have to be replaced?

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  • 112 Answers

See page 8 here:
http://cdn.vizio.com/documents/downloads/hdtv/M550SV/991UG_M420-470-550SV.pdf


From the top
- HDMI - both Audio and Video come from device via one cable.
- RF Coaxial (aka CATV) - both Audio and Video come from device via one cable.
- 15 Pin Dsub (they are calling it RGB), Video comes from this cable and Audio is from a dual 1/4" plug (looks like a headphone wire at both ends).
- Component (this is true RGB) uses RCA type cables - two sets of cables, cable one has 3 RCA at each end and they are color coded, as follows Red/Green/Blue, cable two has two RCA color coded as follows White/Red. Cable one is Video, and cable two is audio, total of 5 connections at source and 5 connections at tv.
- Composite AV - one cable set, coded as follows - Red/White/Yellow, Red/White are audio and Yellow is video.
Hope this helps.

Posted on Nov 25, 2014

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Posted on Jan 02, 2017

toddthetvmd
  • 101 Answers

SOURCE: i have picture but no sound on my 42 inch vizio

If you received a remanufactured board it might be defective,Or did you forget to hook back up the speakers? Sounds dumb but happens alot. Speaker wires get in the way,we disconnect them to look at a board or replace one.Often gets over looked.But I have received several defective boards.Hope this helps. Toddthetvmd

Posted on Oct 26, 2009

  • 451 Answers

SOURCE: No imaging, have sound, backlight, etc.

It may be an input cable problem. Check hdmi and or coax cables to make sure they are not damaged . If you have another tv hook cables up to it to make sure they are working. Hope this helps.

Posted on Dec 31, 2013

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Vizio TV Model M550SV. My tv has picture but no sound. I have reset cable box and changed to different input. Also the Netflix app on tv has no sound either. DVD player also has no sound thru the tv


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check and replace the damaged component/s at its audio output section circuit. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Pull up older posts. Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts. http://electronicshelponline.blogspot.com/

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