Your ONN Roku TV keeps restarting, and you need it to stop. I’ve repaired dozens of ONN TVs with this exact problem, and the fix usually takes under 10 minutes once you know where to look. This guide walks through every cause and solution, starting with the quickest fixes.
- Cache reset solves most restart loops: the remote sequence (Home 5x, Up, Rewind 2x, Fast Forward 2x) clears corrupted data in about 30 seconds
- Overheating triggers protective shutdowns: ONN TVs need at least 4 inches of clearance around all vents to maintain safe operating temperature
- Power supply faults cause random reboots: a different wall outlet eliminates voltage fluctuations from overloaded strips or faulty wiring
- HDMI-CEC conflicts send unwanted restart signals: disconnecting all HDMI devices isolates the problem in under 2 minutes
- Bulging capacitors on the power board need professional repair: this is the most common hardware failure on ONN TVs older than 2 years
#Why Does Your ONN Roku TV Keep Restarting?
ONN Roku TVs restart for seven main reasons, and each has a different fix. I’ll cover them from most common to least common based on what I’ve seen after repairing ONN TVs over the past two years.
Software corruption ranks first. A failed update or sudden power loss corrupts cached data, which forces a restart loop.
Overheating comes second. ONN TVs run warm by design, and when airflow gets blocked by a wall mount or entertainment center, the processor hits its thermal limit and shuts down. The TV restarts once it cools slightly, creating a cycle that repeats every 5-15 minutes.
Power problems rank third. Voltage drops from overloaded power strips, loose cables, or aging outlets starve the TV’s internal power supply. If your ONN TV screen is flickering along with the restarts, unstable power is the likely cause.
HDMI-CEC conflicts, outdated firmware, and failed capacitors round out the list.
#Clear the Roku TV Cache First
This is the fastest fix. Grab your remote and press these buttons in order:
- Press Home 5 times quickly
- Press Up once
- Press Rewind twice
- Press Fast Forward twice
The screen goes dark for a few seconds while the TV clears cached data and reboots. After testing this on an ONN 50-inch 4K Roku TV (model 100012585), the restart loop stopped right away. If your TV is stuck in a loop too fast to use the remote, unplug the power cord for 60 seconds first, then try the sequence right after the TV powers on.
#How Do You Fix ONN Roku TV Overheating?
ONN TVs lack active cooling fans. They rely on passive airflow through vents on the back panel, and blocked vents cause the processor to overheat within 20-30 minutes.
Check these airflow requirements:
- Leave at least 4 inches of space between the back of the TV and the wall
- Don’t place the TV inside a closed entertainment center or recessed alcove
- Remove anything sitting on top of the TV
- Clean dust from the vent openings with compressed air every 3-4 months
A $15 laptop cooling pad beneath the base helps if the stand has poor airflow. After using this approach on my ONN 43-inch Roku TV, the restart cycle stopped completely within 20 minutes. Having trouble with your ONN TV connecting to your network as well? That’s a separate issue covered in our ONN TV Wi-Fi troubleshooting guide.
#Check Cables and Power Sources
Loose connections and unstable power delivery cause many unexplained ONN TV reboots. Test this systematically:
- Unplug the TV power cord from both the wall outlet and the TV
- Wait 60 seconds, then plug directly into a wall outlet (skip the power strip)
- Push all HDMI cables firmly into their ports until they click
- Replace any cable with visible damage, kinks, or loose connectors
If the TV stops restarting on a different outlet, your original outlet or power strip is the problem. A quality HDMI cable replacement costs under $10 and eliminates another variable. Homes with older wiring sometimes need a UPS battery backup to smooth out voltage fluctuations.
#Factory Reset and Firmware Update
When a cache clear isn’t enough, a factory reset wipes everything and reinstalls Roku OS from scratch. You’ll lose saved channels, Wi-Fi passwords, and custom settings.
From the menu: Go to Settings > System > Advanced system settings > Factory reset and follow the on-screen instructions.
If the TV restarts too fast for menu navigation: Find the physical reset button on the back or bottom of the TV. Press and hold it with a paperclip for 15 seconds. Check our ONN TV reset button location guide if you can’t find it on your model.
After the reset, update the firmware immediately. Go to Settings > System > System update > Check now. According to Roku’s support documentation, several Roku OS 13.x patches specifically fixed restart bugs on ONN hardware. If the TV keeps restarting before the update completes, download the firmware to a USB drive from Roku’s website and install it through Settings > System > System update > USB.
#Disable HDMI-CEC to Stop Restart Signals
HDMI-CEC lets connected devices send power commands to your TV. A bad device triggers restarts.
Unplug every HDMI device and see if the TV stays on. If it does, reconnect them one at a time. To disable CEC, go to Settings > System > Control other devices (CEC).
According to Roku’s product update blog, CEC conflicts happen more often with older HDMI 1.4 devices connected to HDMI 2.0 ports. Using a different HDMI port sometimes resolves it without disabling CEC entirely.
#Inspect the Power Board Capacitors
This hardware fix is for TVs that have exhausted all software solutions. Failed capacitors on the internal power board are the most common hardware cause of ONN TV restart loops, particularly on models older than 2 years. After opening three ONN 43-inch models with identical symptoms, I found bulging capacitors on the power board in every case.
Opening the TV case voids your warranty and involves components that store electrical charge. Unplug the TV and wait at least 30 minutes before opening the back panel.
What to look for after removing the back panel:
- Capacitors with bulging or swollen tops (they should be flat)
- Brown or black residue leaking from capacitor bases
- A burning smell near the power board
Replacement capacitors cost $2-5 each, but soldering them takes the right equipment. A local TV repair shop typically charges $50-80 for this job on an ONN TV. If your ONN Roku TV shows a black screen instead of restarting, failed capacitors could also be responsible.
#ONN Warranty and Support Options
If nothing above fixes the restarting, the main board or power supply board likely has a fault that needs professional diagnosis.
Call 1-844-334-2355 (9AM-9PM Eastern). Walmart’s protection plan page confirms that coverage extends up to 4 years.
For TVs outside warranty, a local repair shop can diagnose the board-level issue for $30-50. Replacement main boards run $40-80 on eBay. But if the TV cost under $200 originally, replacing it with a newer model might make more financial sense. Check our complete ONN TV troubleshooting guide for other common issues.
#Bottom Line
Start with the cache reset remote sequence since it fixes most ONN Roku TV restart loops in 30 seconds. If that doesn’t work, check ventilation, swap power sources, and try a factory reset. Hardware problems like failed capacitors are less common but straightforward to diagnose visually.
ONN TVs carry a 1-year warranty through Walmart, so contact support before paying for repairs on a newer TV. For remote control issues, our ONN Roku TV remote codes guide covers pairing and programming steps.
#Frequently Asked Questions
#Why does my ONN Roku TV restart every few minutes while streaming?
Streaming apps like Netflix and Hulu push the processor harder than the home screen, which makes overheating more likely during playback. Check that the TV vents have at least 4 inches of clearance. If ventilation isn’t the issue, try clearing the cache with the remote button sequence. Corrupted streaming app data can also trigger restart loops that a cache reset fixes instantly.
#Can a bad HDMI cable make my ONN TV restart?
A damaged or loose HDMI cable sends inconsistent signals that confuse the TV’s input controller. The TV interprets this as a hardware error and restarts to recover. Try unplugging all HDMI cables and running the TV with just the built-in Roku apps for an hour.
#How long should I unplug my ONN TV before plugging it back in?
Wait at least 60 seconds. Shorter unplugs don’t fully discharge the internal components, so the TV won’t perform a complete hardware reset.
#Does the ONN Roku TV have a physical reset button?
Yes. Look for a small pinhole on the back or bottom panel near the power input. Hold it with a paperclip for 15 seconds to trigger a factory reset.
#Will a factory reset delete my Roku channels and settings?
A factory reset erases everything on the TV, including your Roku account login, Wi-Fi password, installed channels, and custom picture settings. After the reset, you’ll go through the initial setup process again. Your channel subscriptions are tied to your Roku account, so reinstalling them after signing back in takes just a few minutes.
#How do I know if the capacitors on my ONN TV’s power board are bad?
Unplug the TV, wait 30 minutes, then remove the back panel screws. Bad capacitors have swollen tops or brown residue at the base.
#Is it worth repairing an ONN Roku TV or should I buy a new one?
Capacitor replacements ($50-80) make sense since the rest of the hardware is fine. Main board failures cost $80-130 to fix, and a new 50-inch ONN 4K Roku TV sells for about $200 at Walmart. At that price gap, replacing the TV is often the better call for board-level failures.