On a bright, sunny afternoon, you decide to catch up on the latest episode of your favorite show. You grab the remote, hit the power button and…nothing but a black screen. No picture, just sound.
Don’t panic! Black screen issues are common with Onn Roku TVs, but they can usually be fixed with some simple troubleshooting steps. In this comprehensive guide, we’ll walk you through everything you need to know to get your Onn Roku TV back up and running.
Common Causes of Onn Roku TV Black Screen Problems
Before jumping into solutions, let’s look at some of the most common culprits behind black screen issues on Onn Roku TVs:
- Loose or faulty HDMI cable connections
- Incorrect input source selected
- Outdated firmware
- Power supply problems
- Backlighting or LED panel failures
- Faulty component boards like the T-CON or power supply boards
Step-by-Step Guide to Fixing Onn Roku TV Black Screens
Follow these 11 troubleshooting steps, moving through them sequentially until your picture returns.
1. Check All Connections and Cables
Loose cables account for many blank screen issues. Check that all video and power cables are fully inserted into the correct ports on both the TV and your external devices (cable box, game console etc.) Firmly push connectors straight into ports to ensure tight connections.
Inspect cables for any wear, tear or damage as well. If you spot a damaged HDMI or power cable, replace it.
If you encounter no sound or connectivity problems after fixing the black screen, check out these additional troubleshooting guides.
2. Power Cycle the Onn Roku TV
Power cycling forces your TV to restart the system, clearing any temporary glitches causing the black screen.
To power cycle:
- Unplug TV power cable from electrical outlet
- Keep TV unit powered off for 60 seconds
- Plug power cable firmly back in and power on
This restart often fixes black screen problems caused by software crashes or hang-ups.
3. Try Changing Inputs
If your Onn Roku TV has the correct picture when viewing antenna/cable TV channels but goes black when you switch to HDMI with a streaming device or game console, the problem may simply be an incorrect input source selected.
Press the Input or Source button on your remote to change inputs. Toggle through HDMI 1, HDMI 2, etc until picture returns.
You may also need to change input settings in the device (like your Blu-ray player) connected to that specific HDMI port.
4. Check for Firmware Updates
Outdated firmware can trigger Onn Roku TV issues ranging from frozen screens to display problems to apps not loading.
- On the home screen scroll down and select Settings
- Select System > Software Update > Check Now
- If update available, select Download and Install
Firmware updates require 15-20 minutes. This can often correct black screen problems.
Issues like Netflix not loading, random restarts and screen flickering often stem from software faults correctable with firmware updates and resets.
5. Factory Reset the Roku TV
Resetting removes any corrupted data causing system problems:
- From Main Menu, navigate to Settings > Advanced System Settings > Factory Reset > Factory Reset Everything will be deleted!
- Follow prompts on screen to confirm reset
- TV will reboot taking 5+ minutes
Only perform a factory reset if power cycling and firmware updates did not solve the problem.
6. Inspect Power Board and Outlets
A lack of consistent electrical power can cut off video. With the TV unplugged, insert another electrical device into the outlet to ensure it’s working properly.
Examine the power cables for any cracks, exposing wiring or bent plug prongs. Faulty cables cannot effectively transmit power from outlets to TV components. Replace damaged cables immediately.
Also check the voltage switch and fuses on the Onn Roku TV power supply board. If either appear blown or switched off, arrange service by a qualified repair technician to replace the board. Do NOT attempt replacement on your own unless highly experienced with electronics repair.
7. Check Backlight LEDs with a Flashlight
On LCD displays, LED panel backlight failure is a common cause of black screens. Shine a bright flashlight directly on the screen in a dim room:
If you see the picture faintly illuminated: This points to an inverter or backlight failure. Arrange service by a professional to replace the LED panel or inspect for faulty components like capacitors on the inverter board.
If the screen remains pitch black: The LED backlights are working properly. The issue lies with another component like the T-CON board or a software/firmware fault.
A blinking red light can also point to startup issues.
8. Examine T-CON Board for Damage
The T-CON board controls critical LED driver chips and timing for the display. If damaged, it can easily cause black screens.
Removing and inspecting the T-CON board requires disassembling the TV panel and electronics knowledge. Have an experienced repair technician check the integrity and functioning of onboard chips and capacitors. If faulty, arrange for board replacement service.
9. Update Apps
While less common than hardware faults, app glitches can also create blank displays.
- Check for updates on any apps exhibiting black screen problems when launched
- Update the Roku app on your mobile device paired with the Onn Roku TV
- Uninstall then reinstall problematic apps
Updating and resetting apps forces software resets eliminating possible app-specific bugs.
10. Adjust External Devices
Issues with external devices connected via HDMI often translate into problems with the TV display itself.
For video sources like Blu-ray players and cable boxes, check for product updates from the manufacturer and adjust connectivity settings. Reset devices to default factory conditions if problems persist.
For game consoles, disable HDR, enable low resolution SD modes and adjust RGB range to Limited if the option exists in the settings menu.
11. Contact Onn Support
For black screen issues persisting through all TV troubleshooting steps, arrange service through Onn Support online or by phone:
Website: https://onnconsumer.support/
Phone: 1-844-845-5392
Certified technicians can diagnose faults down to the component level through advanced diagnostics before quoting repair costs for T-CON boards, backlights etc.
Why Does My Onn TV Have Sound But No Picture?
If your Onn Roku TV powers on but displays only a black screen while retaining audio, this points to an internal hardware defect – most likely with the LED backlights or a key component like the T-CON board.
Loose cable connections or incorrect inputs would cause complete loss of audio and video. Since the speakers still emit sound, the audio circuits remain intact indicating a selective failure in the video display chain inside the TV.
How to Reset an Onn Roku TV to Factory Settings
Warning: Factory reset erases all personal data including streaming service logins and preferences.
To completely reset your Onn Roku TV:
- From the Home screen, select Settings
- Navigate to Advanced Systems Settings > Factory Reset
- Confirm reset on the prompt message
- Unplug TV for 60 seconds after reset completes
- Set up TV from scratch on next power on
Onn Roku TV Black Screen Fix FAQs
What causes ONN TV black screen of death?
The most common factors behind blank screens on Onn Roku TVs include faulty HDMI connections, defective LED backlights, software crashes, outdated firmware, app issues and malfunctioning component boards.
Why is my Onn TV screen black but sound works?
This points to an internal hardware defect most likely involving the LED backlight panel or a board like the T-CON display controller. The audio circuits remain unaffected. Replacements may be needed.
Does factory reset fix Onn Roku TV black screen?
A factory reset can resolve software crashes causing a black screen. But it won’t fix physical damage problems with the LEDs, T-CON board or other display components.
How do I reboot my Onn 50 inch Roku TV?
To force reboot the 50″ Onn Roku TV, unplug the power cable from the outlet for 60 seconds. Then plug back in and power on the television. If the black screen persists, try a factory reset before contacting Onn Support for hardware service.
Why does my Onn TV turn on but no picture or sound?
If there is absolutely no video or audio from the Onn TV on power on, the issue likely lies with the internal power supply board. Have an electronics repair technician diagnose and replace faulty voltage regulator chips or capacitors on the power supply as needed.
Conclusion
Black screen issues definitely prove frustrating with Onn Roku TVs. But as we covered in this guide, the problem typically stems from a limited set of faults involving hardware components like backlights and cables or software crashes. By methodically working through isolation and troubleshooting steps, you should be able to resurrect your display in most cases without professional intervention. But if problems endure through all remedies or you lack the technical expertise for electrical repairs, promptly arrangements service through certified Onn TV repair experts.
