I am unable to power on this TV through the remote or TV power button. Do not get a green light for power. Should I look for replacing a power supply cord or the power unit within the TV?

MANUAL PROGRAM CODE SEARCH YOUR XR11 REMOTE TO YOUR TV:
1 – Turn ON the TV you will be using with the XR11 remote.
2 – PRESS AND HOLD the SETUP button (bottom left) on your XR11 remote until the LED status light (top of remote) flashes from Green to Red.
3 – Begin manual TV code search by entering 991 on the XR11 remote.
4 – The LED status light will flash Green 2 times.
5 – Repeatedly press the CHANNEL UP button on the XR11 remote to search through the TV codes.
6 – Keep pressing CHANNEL UP button on the XR11 remote until the TV you are programming turns OFF.
7 – After your TV turns OFF press SETUP.
8 – The LED status light on your remote should flash Green 2 times.
9 – Press the TV Power button on the XR11 remote and if the TV turns ON, your XR11 remote is programmed.
Be sure to hold the SETUP button until it flashes Green 2 times after your TV turns OFF.

You can see an easy step-by-step guide to programming your remote right on your TV screen:
Press MENU on your remote control Select Settings & Help Select Settings Select Remote Control Select Program Remote and follow the on-screen prompts You can also use the manual method below: Make sure your TV and your receiver are both on. Use this tool to look up the 5-digit code for your TV. There could be more than one code for your brand of TV. Slide the MODE switch on your remote control to the TV position. Press and hold the MUTE and SELECT buttons at the same time until the green light at the top of your remote flashes twice, then release both buttons. Using the number buttons, enter the 5 digit code for your brand of TV. The green light under the TV should flash twice. Aim the remote at your TV and press the VOLUME UP button. If the volume doesn't increase, repeat Steps 3-5, trying a different 5-digit code for your TV. If your remote control fails to program using all available codes, try scanning for additional codes. If one of the codes worked, proceed to the next step. Press and hold MUTE and SELECT buttons until the green light at the top of your remote control flashes twice. Enter 9-6-0 using the keypad on the remote control. The green light should flash twice again. Slide the MODE switch on your remote control to the DIRECTV position. Follow these steps to scan for additional TV codes using your DIRECTV remote: Slide the MODE switch on your remote control all the way to the right to the TV position. Press and hold the MUTE and SELECT buttons at the same time until the green light at the top of your remote flashes twice, then release both buttons. Using the number buttons, enter 9-9-1. The green light on your remote should flash twice. Aim the remote at your TV and press CHAN/PAGE UP button. Tap the CHAN/PAGE UP button repeatedly until the TV powers off. When the TV powers off, press and release the SELECT button. Note: If the green light flashes three times before your TV responds, then all codes have been cycled through. Our remote controls are guaranteed to program to your DIRECTV receiver, but your TV may not be compatible with our remote control.

seems like capacitor problem, chack them and if thay have exploded replace them.

How to scan for TV codes on your DIRECTV remote

• Make sure your TV is turned on.
• Slide the mode switch at top of remote to "TV".
• Press and hold the MUTE button. This is located above the number 1 button.
• While still holding down MUTE, press and hold the SELECT button until green light at the top of the remote flashes twice.
• Then enter 9-9-1, the green light on remote should flash twice.
• Point remote at TV and press CHANNEL UP button. Tap the CHANNEL UP button repeatedly until the TV powers off.
• When the TV powers off, press and release the SELECT button.

How to program your DIRECTV remote control:

Press MENU on remote.
Select "Parental, Favs and Setup".
Select "System Setup".
Select "Remote".
Select "Program Remote".

While aiming remote at device, follow onscreen instructions to program remote to TV, DVD, or other device.

How to program the white DIRECTV remote to your TV

Look up the control codes for your DIRECTV remote control.
Make sure your TV is turned on.
Slide the mode switch at top of remote to "TV".
Press and hold the MUTE button. This is located above the number 1 button.
While still holding down MUTE, press and hold the SELECT button until the green light at the top of the remote flashes twice.
Enter the first TV code you have. The green light on remote should flash twice.
Aim remote at TV and press PWR button once. The TV should power off.
Once the TV is able to power off/on and control the volume, slide the mode switch at the top of the remote back to the left (DIRECTV). Your remote is now programmed.

If the TV does not power off, repeat steps 4, 5, 6, and 7, using the next code for your TV brand.

If remote control fails to program using all available codes, try scanning for the code.

How to scan for TV codes on your DIRECTV remote

Make sure your TV is turned on.
Slide the mode switch at top of remote to "TV".
Press and hold the MUTE button. This is located above the number 1 button.
While still holding down MUTE, press and hold the SELECT button until green light at the top of the remote flashes twice.
Then enter 9911, the green light on remote should flash twice.
Point remote at TV and press CHANNEL UP button. Tap the CHANNEL UP button repeatedly until the TV powers off.
When the TV powers off, press and release the SELECT button.

Note: If the green light flashes three times before TV responds, then all codes have been cycled through. Our remote controls are guaranteed to program to your DIRECTV receiver, however your TV may not be compatible with our remote control.

You can find more help in the Remote Controls section of our Technical Forums at forums.directv.com. You can also use our Interactive User Guide to learn the ins and outs of your remote control.

Here's how to scan for TV codes on your DIRECTV remote

1.Make sure your TV is turned on.

2.Slide the mode switch at top of remote to "TV".

3.Press and hold the MUTE button. This is located above the number 1 button.

4.While still holding down MUTE, press and hold the SELECT button until green light at the top of the remote flashes twice.

5.Then enter 991, the green light on remote should flash twice.

5b. Press 1 again (it will flash twice again), then you press the power on button at the very top right.

6.Point remote at TV and press CHANNEL UP button. Tap the CHANNEL UP button repeatedly until the TV powers off.

*If you hit channel up very fast, you risk going past the code. Pressing channel down will back it up. I alway hit channel up very fast till the tv turns off, then back it up slowly till it comes back on.

7.When the TV powers off, press and release the SELECT button.

*Note: If the green light flashes three times before TV responds, then all codes have been cycled through. Our remote controls are guaranteed to program to your DIRECTV receiver, however your TV may not be compatible with our remote control.

Ok it took me a while. Go to this link to find the codes for you remote: 10054 is the most used code for Magnavox. I hope this helps you out. Good Luck!!!!!!!
http://www.directv.com/DTVAPP/content/remote_codes

Here's how to program your DIRECTV remote control:

1. Press MENU on remote.
2. Select "Parental, Favs and Setup"
3. Select "System Setup"
4. Select "Remote"
5. Select "Program Remote"

While aiming remote at device, follow onscreen instructions to program remote to TV, DVD, or other device.


How to program the white DIRECTV remote to your TV

1. Look up the control codes for your DIRECTV remote control.
2. Make sure your TV is turned on.
3. Slide the mode switch at top of remote to "TV".
4. Press and hold the MUTE button. This is located above the number 1 button.
5. While still holding down MUTE, press and hold the SELECT button until the green light at the top of the remote flashes twice.
6. Enter the first TV code you have. The green light on remote should flash twice.
7. Aim remote at TV and press PWR button once. The TV should power off.
8. Once the TV is able to power off/on and control the volume, slide the mode switch at the top of the remote back to the left (DIRECTV). Your remote is now programmed.

If the TV does not power off, repeat steps 4, 5, 6 and 7, using the next code for your TV brand.
If remote control fails to program using all available codes, try scanning for the code.


How to scan for TV codes on your DIRECTV remote

1. Make sure your TV is turned on.
2. Slide the mode switch at top of remote to "TV".
3. Press and hold the MUTE button. This is located above the number 1 button.
4. While still holding down MUTE, press and hold the SELECT button until green light at the top of the remote flashes twice.
5. Then enter 991, the green light on remote should flash twice.
6. Point remote at TV and press CHANNEL UP button. Tap the CHANNEL UP button repeatedly until the TV powers off.
7. When the TV powers off, press and release the SELECT button.

Note: If the green light flashes three times before TV responds, then all codes have been cycled through. Our remote controls are guaranteed to program to your DIRECTV receiver, however your TV may not be compatible with our remote control.

if you replaced the supply board then there is issues with the decoder board as you would need to chec kthat and see if its not the issue.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

take your tv to technician who can check your power supply, if your power is coming on and off, than a problem is not as big. firstly let him check a ht of a supply constantly, your supply is cutting.