Hisense Roku 50R7E boot loop fix when reset button doesn't work.

Introduction

This tutorial provides a step-by-step guide to fixing a boot loop issue in the Hisense Roku 50R7E TV model. If your TV keeps restarting and doesn't get past the "Hisense - Roku TV" logo, and the reset button doesn't work, you may need to replace the backlight filter capacitors on the circuit board. This guide will help you through the process.

Step 1: Prepare Your Workspace

• Gather necessary tools:
  • Phillips screwdriver
  • Small pointed tool (like a paper clip or ballpoint pen) for the reset button
  • Soldering iron and solder sucker (for capacitor replacement)
  • Multimeter (for testing voltage)
• Ensure you have replacement capacitors (10 microfarads at 350 volts) ready.

Step 2: Attempt a Soft Reset

• Locate the reset button on the side of the TV near the input ports.
• Use a small tool to press and hold the reset button.
• While holding the button, plug the TV into the power source.
• Keep holding the button for 15-20 seconds, then release it.
• Check if the TV turns on normally. If it does not, proceed to the next step.

Step 3: Remove the Back Cover

• Disconnect the TV from the power source.
• Remove the two feet of the TV by unscrewing the black Phillips screws (two screws per foot).
• Unscrew all the screws on the back cover of the TV.
• Carefully lift off the back cover, ensuring no wires are connected.

Step 4: Inspect the Circuit Board

• Identify the main board, where you will find the power supply and other components.
• Look for swollen capacitors; these are usually 10 microfarads at 350 volts.
• Use a multimeter to check the voltage across the capacitor leads; it should be consistent when the TV is powered on.

Step 5: Replace Swollen Capacitors

• Unplug all components connected to the circuit board, including:
  • Speakers
  • LVDS cables to the panel
  • Wi-Fi module
  • LED connector
• Remove the screws securing the capacitors on the board.
• Heat the solder joints of the bad capacitors and use a solder sucker to remove them.
• Insert new capacitors in the same orientation (check the negative and positive markings).
• Solder the new capacitors in place, ensuring correct polarity.

Step 6: Reassemble the TV

• Reconnect all cables to the circuit board, ensuring secure connections.
• Reattach the back cover and screw it back in place.
• Reinstall the TV feet and secure them with screws.

Step 7: Final Testing

• Plug the TV back into the power source.
• Turn the TV on and observe whether it powers up normally.
• Check the brightness of the screen; it should be brighter than before.
• If the boot loop persists, repeat the reset button process.

Conclusion

Replacing the backlight filter capacitors is a practical solution to fix the boot loop issue in your Hisense Roku 50R7E TV. Always ensure proper handling of electrical components and check connections thoroughly during reassembly. If problems persist, consider seeking professional assistance or further troubleshooting.