Hi. Try learning the power commands for your Vizio TV from the original remote. The power commands that the Harmony remote is using may not be correct. The following tutorial by Logitech will assist you with this.
http://logitech-en-amr.custhelp.com/cgi-bin/logitech_en_amr.cfg/php/enduser/std_adp.php?p_faqid=9605
Regards,
D
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