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How do I troubleshoot and replace a motor board on a TFT remote control monitor?

If one axis of your TFT RC Flex Monitor isn’t moving—while other functions like stream, fog, or vertical movement work—your issue may be with a faulty motor board. This guide walks you through safe power-off diagnostics, board swapping, and motor board replacement.

If your TFT RC Flex Monitor has a single axis that’s not responding—while everything else works normally—it’s likely an issue with one of the three identical motor boards inside the monitor. This guide walks you through the full process of diagnosing and replacing a faulty board safely.

Safety First

  • Always power down the monitor before servicing.

  • Look for the green LED indicator to turn off before opening the enclosure.

  • If the truck is hardwired, disconnect power directly from the battery.

Step-by-Step Diagnostic Instructions

  1. Power Off the Monitor

    • Ensure the monitor is off.

    • Wait for the green LED to shut off completely.

  2. Open the Monitor Enclosure

    • Remove the outer cover carefully.

    • Watch for the ribbon cable attached to the back side—do not yank it.

  3. Secure the Lid

    • Lightly reattach one screw to hold the lid in place for safety during testing.

  4. Identify the Motor Boards

    • Inside, you’ll find three identical motor boards, labeled:

      • Nozzle

      • Vertical

      • Horizontal

  5. Swap Boards to Test the Fault

    • For example, if horizontal movement is not working:

      • Remove the horizontal board.

      • Replace it with a working board (e.g., from vertical).

    • Steps:

      • Disconnect the blue and white communication wire.

      • Disconnect the power wire.

      • Slide the board out and swap it.

  6. Reconnect Wires and Power

    • Reconnect all power and communication wires.

    • Power the monitor back on and wait for the green LED to finish flashing.

  7. Test Movement

    • If horizontal now works and vertical doesn’t, the issue followed the board—confirming a faulty board.

Replace the Faulty Board

  1. Power Down Again

    • Turn off power and verify the green LED is off.

  2. Install the New Board

    • Remove the faulty board.

    • Insert the replacement board (provided in an anti-static bag).

    • Reconnect all wires firmly.

  3. Power On and Verify

    • Boot up the monitor again.

    • Test all axes: horizontal, vertical, stream, and fog.

    • If everything works, the repair was successful.

Final Reassembly Steps

  • Power off the system once more.

  • Tuck the ribbon cable safely behind the lid.

  • Confirm the gasket is seated properly.

  • Reinstall screws using a cross pattern to ensure even pressure and avoid leaks.

  • Power the system back up and perform a final test of all axes.

Return the Faulty Board

  • Place the damaged board into the anti-static bag.

  • Contact TFT Customer Service to request an RGA number.

  • Return the board for evaluation and credit (if eligible).

💡 If the ribbon cable becomes disconnected: ensure the contact side is aligned with the contact pins on the board. Slide it in, push the plastic retainer down, and lock it into place.