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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.
This page contains a troubleshooting guide and if you are still unable to solve the problem, it lists the information you need for contacting Logitech support. Sorry, but there is too much information to paste it all here.
I had a similar issue and only needed to "re-configue" the remote... Basically, just try plugging it back into a USB cord ( connected to your computer) and go to the original programming home page and click the "Update button." It will re-program your remote as if it was new.. Over time your Harmony may lose or forget the frequency of your various components. This happened to me. Also, make sure the remote has a full charge while you're programming it. Give it a try !
I would hook the harmony back up to your computer and the update the remote. If that does not fix the problem then I would down load the firmware and then update your remote. If you still have problems I would check your check your buttons in the program. You can do this by logging onto your Harmony account, select the Activities tab and press on the “customize buttons”under the activity you are trying to fix.Scroll down to the menu exit info buttons and see if there assigned to the correct device and correct command.If none of this works I would see if the menu button works in another activity likeWatch TV or Watch DVD..If the menu button does not work in another activity then the remote may be broke.If it does work then I would try the original remote with your DVR and see if that works.If that works then I would manually teach the harmony remote.Harmony calls this “Learn command” It’s a button in the lower right corner while in the “customize button” tab.. If none of this works then pull out your 45 and put a hole in it. Hope this helps
I have an 890 also. I've found that the remote doesn't always charge when it the charger. I have to put a rubber band around it and make sure it shows that the the battery symbol on the display is showing that it charging. Or the battery isn't taking a charge anymore and I'd try to replace it. Doesn't really hold a charge very long either.