Sometimes, a monitor blackout can be as simple as a loose cable between your computer and its monitor. Just jiggling the cable a bit might cause an intermittent connection, which causes the screen to go dark. Make sure the cables are properly and securely connected.

Okay, it could be the Directv box issue which isn't sending out correct video signals to this TV, following troubleshooting step should be tried that might help - Have you tried to disconnect the TV and Cable Box power cords from the power outlet for 5 minutes to reset, replug back in, let cable box reboot that may take several minutes and check? If not yet, please try it now and reply back.

1) Observe the emitter on the front of the remote control through a digital camera (or the camera of a mobile phone). 2) Now press any button on the remote control. 3) If you see a red light flashing indicate that the remote control is working. The TV may be defective. 4) If not, the remote control may be defective and needs replacement. After powering on the UB420, connecting the USB flash drive results in a reboot and rapidly flashing red LED during the update process, which takes several minutes - be patient. (The 1.69 update took over 5 minutes.) The UB420 firmware update is finished when the red LED repeats a series of 3 flashes, pause, 3 flashes.

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Try to find a backlight with the connector already attached to it, so you can plug it into the inverter board. Make sure the connector on the backlight lamp is similar to the connector on your LCD screen. As soon as I turned on the laptop, my backlight lamp lighted up. Yep, that's the problem.

Click Start, type in "screensaver" (no quotes) in the search box; wait a few seconds and then click the Change Screensaver link when it is presented. The "Change Screen Saver Settings" window will appear. Set the screensaver to "None" and click Apply. Now, use the monitor to see if it powers off or goes blank.

Plug the electric cord from the television back into the outlet, and then turn on the TV by pressing in the power button with your finger. The red light on the front of the set should not be blinking anymore. If this doesn't work, repeat Steps 2 through 4 at least three more times. If the red light is still blinking, go to the next step.

Disconnect the computer's power supply cord for 60 seconds. Reconnect the computer. Power on the computer. Connect the power supply to the external drive. Connect the drive's USB or FireWire cable and check for detection. If that does not correct the behavior, and if the drive is also not detected by your computer, the blinking light is.

Then, select Sign out, Reset , or Deactivate. Restart your home network. Turn off or unplug your smart TV. Unplug your modem (and your wireless router, if it's a separate device) from power for 30 seconds. Plug in your modem and wait until no new indicator lights are blinking on.

These troubleshooting methods should help: Turn the TV off and on. Unplug the TV for five minutes. Check the cables and hardware. Check the video source. Consider the room’s lighting levels. Inspect the WiFi router. Update the TV. Change the energy efficiency settings.

Several reports suggest that the Roku black screen issue when using Dolby Vision popped up after updating their device software to Roku OS 10.0.0. Source. Upon further investigation, it came to light that the problem is persistent only with LG OLED TVs and when using an external A/V decoder. When directly connecting the Roku Ultra to the LG TV.