Why is My Hisense Roku TV Won’t Turn On? (Easy Fix)

Well, movie night is all planned with snacks prepared, but my Hisense Roku TV won’t turn on, ruining my relaxation time. I’ve been there, trust me, so in this quick guide, I will try to help you! 

The problem may range from a temporary power adapter fault to internal hardware damage, making proper diagnostics essential to identifying the root cause. 

Today, we will go through all of the possible causes, so let’s get started!

My Hisense Roku TV Won’t Turn On – Here’s How I Fixed It!

Tip: Force-start the TV using this combination: “Home” 5x → “Up” 2x → “Fast Forward” 2x, and the TV’s menu should start cycling right away before shutting off. 

1. Force Reboot the TV

The Hisense Roku TV can be turned on using 2 separate power buttons–the one on the remote control and the one on the back of the TV.

Well, both power buttons can also be used for “force” rebooting the TV, once held for longer than 30 seconds. 

Here’s how:

• Using the remote: Ensure the TV is plugged in and hold the remote’s “Power” button for approximately 20 seconds, while pointing it towards the TV.
• Using the TV button: Double-check if the Hisense Roku TV is plugged in and hold the “Power” button on the side panel for a bit longer than 30 seconds.

To turn on the TV, press either of the power buttons, and the display should light up immediately.

Tip: Try reinserting and replacing the batteries of the remote control if it appears unresponsive!

2. Unplug the TV Adapter

If the issue persists, then it could have something to do with the Hisense Roku TV’s inline power supply, thus, the power adapter.

Well, a faulty or loose cable connection could lead to a variety of power-related issues, such as powering off, rebooting, or constant flickering of the TV screen.

To power cycle the TV properly, follow these steps:

1. Unplug the power cable from the Hisense Roku TV.
2. Press and hold the “Power” button on the side panel.
3. After that, release the button after ~10–15 seconds.
4. Disconnect the power cable from the back of the TV.
5. Wait for another 60 seconds while the TV discharges.
6. Reseat the power cable and test the Hisense Roku TV.

If the TV still appears to be nonfunctional, then the fault could be with the power source instead, so let’s learn more…

3. Test a Different Wall Outlet

Perhaps, it could be the outlet that’s causing issues with your Hisense Roku TV.

Similar to all other electrical appliances, the Hisense Roku TV has an internal transformer that converts the outlet’s 120V output to a voltage that’s usable by the motherboard.

If the output transmits less or, in some cases, more than 120V, the TV’s transformer will prevent the device from starting up at all.

So, relocate the TV, along with the necessary equipment and check if another outlet would supply the correct amount of voltage. 

4. Check Roku’s Input Source

After a few troubleshooting steps, I was still wondering why won’t my Hisense Roku TV turn on, and then I figured it out–an empty input source.

Well, this could happen if you have recently connected a third-party device and didn’t know the exact input port (source) it was connected to.

• To change the input source on the Hisense Roku TV, press the “Input” or “Source” button once and wait for the interface menu to appear.

If you selected an empty input source on the Hisense Roku TV, you won’t be able to control any of the TV’s operations until you’re back at the homepage or select a usable TV source. 

5. Unplug All External Devices

Proceed with disconnecting all third-party devices from the Hisense Roku TV, to determine if any of the devices are causing a problem.

Generally, there are two types of external devices:

• Interface panel devices: Devices that connect to the TV over HDMI, Optical, RCA, AUX, or Component cables (audio systems or consoles).
• Electrical external device: Devices that extend or split the power adapter connection of your Hisense Roku TV (power strips or dividers).

Make sure neither of these devices participates in the setup of your TV, and connect the power adapter directly to the outlet.

Use the remote or the panel TV button to turn on and test the TV. 

6. Test the Hisense TV Backlight

Well, before proceeding with the more serious solutions, there is another simple thing you can check–the condition of your TV’s backlight.

The “backlight” refers to the LCD/LED panel behind your TV’s display, which illuminates the pixels at the supported quality.

Initially, a backlight fault could start dimming your display, until eventually, it goes pitch black, and, looks like the TV won’t turn on.

Keep in mind that the backlight is only repairable by the manufacturers, and all you can do is tweak a few picture settings to check whether it’ll improve.

How to Test Hisense Roku’s Backlight?

To determine if the backlight has a problem, eliminate all light sources in the room, then shine your smartphone’s flashlight directly into the TV’s screen.

Try to see if any of the pixels behind the display are illuminated through the flashlight’s beam.

• If you can see silhouettes, it means that the backlight has been weakened greatly and has started to fail.
• If you can’t see anything, it means that the Hisense Roku TV fails to turn on, and the display might still be functional. 

You can generally improve the backlight by regulating the brightness and changing the picture mode of the Hisense Roku TV.

Since you’re unable to access the television menu yet, try gently tapping the panel (behind the screen) a couple of times to relocate misaligned components. 

7. Reduce Roku’s Temperatures

Overheating is one of the prime causes of the Hisense Roku TV startup failure.

Well, especially during the summer, your TV could exceed the operational hardware temperatures and enter the “overheating” margin, which causes the system to enter “emergency” mode.

The Hisense TV will not be able to turn on whilst in “emergency” mode, meaning the hardware temperatures must be stabilized first.

7.1 How to Tell if Hisense Roku Overheats?

The most common overheating symptoms include:

• Frequent powering off or rebooting of the TV.
• A flickering or freezing display of the Hisense.
• The TV’s panels consistently feel warm or hot.

The Hisense Roku TV’s vents are located on the rear panel, so verify nothing covers them.

An obstructed airflow could overheat the TV in 5 minutes, so make sure there are no obstructions.

7.2 How to Prevent Hisense Roku Overheating?

Here are several tips to prevent overheating:

• Ensure there are no heat conductors close to your TV.
• Prevent direct sunlight from flashing on the Hisense TV.
• Unplug the Hisense Roku TV for about ~15–20 minutes.
• Clean the vents of the TV from dust accumulation/debris.

Note: The Hisense Roku TV operates at roughly 41°F-9-5°F (5°C–35°C), which means that if the value increases above 95°F, the TV will enter emergency mode immediately. 

8. Reset the Hisense Roku TV OS

A factory reset is an extremely potent solution for software-level issues with your Hisense Roku TV.

The factory reset can be either activated through the settings or by pressing and holding the “Reset” button on the back panel.

• Locate the “Reset” button on the rear panel of the TV, behind the central part of the display, and hold it for 10–15 seconds.

Verify that the TV’s power adapter is connected firmly and check if the display responds to the reset.

If the procedure has been initiated successfully, the display should partially illuminate, then shut down again for the upcoming 2–3 minutes, until the reset is finalized.

9. Inspect Roku TV’s Hardware

I was worried, just like you, after attempting so many solutions but my Hisense Roku TV won’t turn on, but finally I found the problem. 

It was a hardware defect, so inspecting it involves disassembling the hardware and inspecting each segment individually for potential faults.

Alert: Disassembling the Hisense Roku TV voids the active warranty of your product.

How to Disassemble Hisense Roku TV?

1. Unplug the TV’s power cable from the A/C source.
2. Wait 1–2 minutes until the electricity is discharged.
3. Lay the Hisense Roku TV display on a soft surface.
4. Remove all 8 screws using a Phillips screwdriver.
5. After that, gently pry open the rear panel of the TV. 

Now, locate all of these segments:

• Power board: Converts the outlet’s 120V to power usable by the Hisense Roku TV.
• The mainboard: The “brain” of your TV, intended for processing all of the TV’s functions, audio and video.
• Capacitors: Small segments holding charge that can be found all over the components of your TV. 

How to Detect a Power Board Fault?

Start by inspecting the power supply board. Well, damage to the board includes burnt spots, disconnected ribbon cables, or broken connectors.

Check if each of your supply board’s components is in good condition and move on to the next segment.

How to Detect a Mainboard Fault?

All of the Hisense Roku TV’s interface, display, backlight, and A/C cables connect through the mainboard.

Check for disconnected cables, peeled connectors, or burnt spots on the surface of the mainboard, as this could be an indication of a fatal hardware defect.

How to Detect a Capacitor’s Damage?

Capacitors tend to fail much more commonly in comparison to the other segments in your TV.

A “blown” capacitor can be quickly recognized by checking if the housing’s “head” is split open. If it is, check the exact voltage values of the capacitor and search for a replacement.

• The capacitors are the only user-replaceable component.

Tip: If you’re unfamiliar with how to diagnose hardware issues with the Hisense Roku TV, it’s best to get in touch with Hisense customer support.