Hisense TV Backlight Not Working: How to Fix?

Having your Hisense TV suddenly stop displaying a picture can be frustrating. While there are various reasons this may happen, a common cause is a backlight failure. The backlight provides the illumination for the TV’s LCD screen. When it stops working properly, the picture will go completely dark even though the TV is still on. Fortunately, there are steps you can take to troubleshoot and potentially fix a Hisense TV with backlight issues on your own before resorting to professional repair or replacement.

Backlight Not Working on Hisense TV: What to Do?

Determine if the Backlight is the Cause

Before attempting to fix the backlight, you’ll want to verify that it is indeed the culprit behind the TV’s dark screen.

  • Make sure the TV is plugged into a working electrical outlet.
  • Ensure all video cables connecting external devices are securely attached.
  • Press the power button on the TV and on the remote control if applicable.
  • If the TV turns on but displays no picture even as you adjust the brightness, the backlight is likely faulty.
  • However, by accessing the on-screen menu, rule out other problems like incorrect settings. If you can navigate the menu, the backlight is definitely the issue, but the picture is dark.

Inspect for Physical Damage

HIsense TV Edge

  • Closely examine the back and edges of the TV for any visible damage.
  • Cracks, dents, or other signs of dropping or impacts can damage internal components like LED backlight strips.
  • Damage to the case that allows light bleeding indicates cracks in the LCD panel, which require replacement.
  • If the backlight was damaged by physical trauma, the repair will unlikely be a DIY project. Consult a TV repair shop for options.

Check Power Supply Voltages

Measure Power Supply of Hisense TV Board

  • The LED backlights in Hisense TVs require specific voltages from the power supply to operate correctly.
  • The backlights will malfunction if these are interrupted due to failing capacitors or other issues.
  • Unplug the TV and remove the back cover.
  • Locate the power supply board and check for damaged capacitors like bulging tops or leaked electrolytes.
  • Use a multimeter to test critical power rails supplying 12v, 5v, and other expected voltages.
  • Replace any bad capacitors if capable, or seek professional service for power supply issues.

Replace Faulty LED Strips

BACKLIGHT OF HISENSE TV'

Modern flatscreen TVs use LED strips or arrays placed along the edges of the screen to provide backlighting. Issues with a few LEDs can diminish backlight intensity. With many burned-out LEDs, the picture will be too dark to view properly. Determine if your Hisense TV uses edge lighting or direct backlighting based on the location of the strips. Carefully detach the bad LED strip and install an identical replacement, properly reconnecting all cables. Only perform this repair if you have electronics experience.

Reset Inverter Board

  • If the backlights periodically flash, flicker, or cut out, the inverter board could need resetting.
  • The inverter provides controlled AC power to the LEDs.
  • Locate the inverter board inside the TV’s case, detach all cables, then press the reset button if there is one.
  • Reconnect cables and test backlight operation.
  • If the issue persists, replace the inverter board with an identical part. This repair requires high caution when working with hazardous AC voltages.

Check for Loose Connections

ribbon cables of hisense tv board

  • Loose wire harnesses, cables, or connectors can interrupt power delivery to backlight components.
  • Unplug the TV, then methodically check that all internal cable connections snap securely.
  • Reseat ribbon cables firmly into their sockets.
  • Ensure power cables to the LED strips or inverter board are not damaged or disconnected.
  • Loose wires leading to external loads like speakers can also cause problems in rare cases. Proper cable management ensures reliability.

Attempt a Power Cycle Reset

Power Cycle TV

  • If the backlight stopped working due to a software or control malfunction, a full power reset may resolve the problem.
  • Unplug the TV and hold down the power button for 60 seconds to discharge residual voltage.
  • Leave unplugged for several minutes more.
  • Then, plug it back in and attempt to power up the TV.
  • The extended power interruption allows circuits to reset, which may restore normal backlight operation. Try this simple fix before attempting any internal repairs.

Update Firmware and Software

Hisense TV System Update

Hisense periodically releases firmware updates for their smart TV models to fix bugs and enhance functionality. Updating may be the solution if the backlight issue is related to a software problem. Consult your TV manual to check the firmware version. If an update is available, download and install it per Hisense’s instructions. Be sure your TV software and apps are also up to date. Outdated firmware is often responsible for apparent hardware defects.

Replace the Main Board

Hisense TV main board

The main board regulates power flow and controls subsystems throughout the TV. If troubleshooting points to this board as the culprit, replacement is necessary. Record component locations and cable connections before removing the main board. Obtain an identical replacement board made for your specific Hisense model. Carefully install the new main board, recreate all previous connections, and test the backlight operation before reassembling the TV. The main board installation is complex – consider professional assistance.

Replace the LCD Panel

Replacing the LCD panel may be needed for issues like backlight bleed or cracks allowing light through. This involves disassembling the TV, disconnecting and removing the old LCD panel, and then installing a compatible new replacement. It’s a difficult repair that’s only cost-effective for large, expensive TVs. Getting a professional LCD panel replacement will be the best option for most models.

Contact Technical Support

Contact Hisense’s support team if you’ve exhausted DIY troubleshooting without success. Provide your TV’s model information and the details of the issue. Hisense should be able to provide further specific troubleshooting tips or confirm a need for repair. Out-of-warranty models may have repair costs unless Hisense offers assistance as a courtesy. Ask about any applicable repair coverage or discounts on replacements.

Summary:

Backlights are an essential but failure-prone component in modern flatscreen Hisense TVs. With persistence and care, many backlight problems can potentially be repaired at home. Simple fixes like reseating connections or updating firmware may get your Hisense TV lighting up again. For complex repairs or replacements involving the LCD panel or power supply, seeking professional assistance will often be advised. With the right troubleshooting steps, you can hopefully restore your Hisense TV’s backlight and enjoy clear picture quality again.

About: Pankaj Konwar

Pankaj Konwar is the founder and writer of 5GMP. He writes in-depth buying guides, tips for troubleshooting common TV problems, and reviews of the latest TV models.

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