When I change channels with my Harmony 650 remote It changes the channel but the Xfinity guide pops up and I have to select exit to get rid of it. How can I eliminate the guide when changing channels?

Try by set the remote control with an other set-up code said for your TV. Set-up (Programming) procedure is too much to type in here, and is not practical and it will differ brand-to-brand remote controls. If you wish to get more; check the sites linked here. It has set-up code list & set-up procedure to many popular brand remote controls. One among it has general set-up codes to check with TVs and other devices are given, in the order of the 'device's brand name list' in alphabetical order. Pull up older posts. Search the sites by type in the brand name to your device in its search box at the top right part of the display window. It will help you to find the document easily.
http://remotesearch.blogspot.com/
http://electronicshelponline.blogspot.com/
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hit the exit button on your remote

open the remote control and clean the keypad for dirty, oxide, corrosion, and bad contacts.
2) replace new batteries ALKALINE , full charge
3) retigh the springs contacts batteries, with long pliers for better contacts.
4) try again.
5) otherwise you must go to the repair shop TV for fix it.
God bless you

I have an old Roku and was able to get the harmony 650 to recognise it. The model of my old Roku was SD since I originally used it on my analog TV. Everything seems to work without having to "teach" the Harmony. The only quirk was having to use the Exit button to go back to a Netflix movie description and again to go back to the channel list.

Hello
Your RCA, system setup has changed I thinks.To change this you have to go to the Menu option surf for system settings, and change the system reception to "AUTO".

Setup

The Setup menu allows you to access the GUIDE Plus+ system setup information. To access the

Setup option:

1. If the GUIDE Plus+ system isn't on your screen, press GUIDE on your remote control.

2. Press MENU to select the Menu Bar.

3. Use the right arrow to highlight the Setup menu selection.

4. Use the up and down arrows to select Change system settings, Review options, or

View demo.

• Change system settings Confirms the settings you completed in the GUIDE Plus+

system setup are correct.

• Review options Displays the GUIDE Plus+ system auto display options.

On Automatically displays the GUIDE Plus+ system when you press the ON•OFF

button on the remote control.

Off Disables the GUIDE Plus+ system from being displayed when you press the

ON•OFF button on the remote control.
• View demo Runs the GUIDE Plus+ system demonstration

Note: If you have not completed your GUIDE Plus+ system setup, these options will not be available. A
screen will prompt you to complete your setup.

Getting In & Out of the GUIDE Plus+ System

To enter the GUIDE Plus+ system:

• Press GUIDE on the remote.

• Press and hold MENU for 2 seconds on the front panel.

To exit the GUIDE Plus+ system:

• Highlight a program and press OK to exit the GUIDE Plus+ system and tune

to the channel.

• Press GUIDE to exit the GUIDE Plus+ system and tune to the channel

displayed in the video window.

• Press CLEAR to exit the GUIDE Plus+ system and return to the original
channel
OK.

Harmony remotes use IR commands, so you will always have to have line of sight for it to work.

However, if you are using the RF extender, ensure that the device you are using to change channels is assigned to the extender, and that the extender is properly paired.

There is a setting that may need to be changed within the Xbox 360, to allow it to be controlled by a Harmony Advanced Universal Remote.

To configure your Xbox 360 to respond to a Harmony Remote

1. Using your original Xbox 360 controller, go into the Xbox Dashboard on the Xbox menu
2. Select "Console Settings"
3. Select "Remote Control"
4. If "All channels" is selected, select "Xbox 360 Media Remote”. If "Xbox 360 Media Remote" is selected, then select "All channels"

Your Harmony remote should now control your Xbox 360

Was it working before?  Is it possible you selected the wrong brand of TV when programming the remote?  Do you use a cable box or satellite dish with your TV (in other words, do you change channels by changing the channel on the TV, or on the digital box connected to your TV)?

I can help you with your Logitech Harmony 890 remote control.

The Logitech Harmony 890 remote control is programmed through the
Harmony Windows Setup Software.

I recommend resetting it up with your components to get rid of the two channel problem.

Once installed, you will simply run the program and select the devices you would like to control from menus. This program finds the right codes for you and loads them into your remote control.

You can get a copy of the Harmony 890 Manual by clicking here.

I hope that helps.
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Your set uses the 195 series chassis and you have something set wrong in your guide plus. Go into the TV's menu and do a complete set-up. Take the remote and press MENU, then "8" to enter setup, then press "1" for "begin setup now" and then press "1" for English, and so on. You must enter "set up guide plus+", then press OK on the remote to choose "setup", select "USA", enter your zip code, and then if you choose "yes" for "do you have cable?" you MUST then choose "no" for "do you have a cable box" If you choose "yes" for that choice, your tuner will lock on one channel no matter what channel you try entering. After choosing "no" for "do you have a cable box", choose "no" for "do you have a VCR?", exit the guide plus menu and then skip the rest of the steps by pressing "2", and then exit the main menu by pressing "0". Your channels will then work normally.