New driver installed but display is not lighting; Driver shorted to cabinet

Potential Symptoms

  • Driver has just been replaced and works fine but shortly after replacement the display goes blank.
  • Installed a new driver and the display is not lighting up.
  • Power (+5V) LED is lit on driver (may be dim) but Status LED is off (not flashing as it should be).
  • Drivers that are before and after the suspected failed driver may work properly.


  • Product Family: Digit and Price Displays
  • Product: FL-2000, FL-2100, FL-2300, FL-4000, DF-2000, DF-2009, DF-2100, DF-2300, DF-4000, Fuelight or DataMaster, Gas Price or Petroleum Displays, FL or DF digit product
  • Component: New driver installation
  • Control System:


  • Driver damage has resulted from shorting to the cabinet face.
    • Missing standoff (spacer) or insulator plastic that separates the driver from the back sheet of the display.


  1. Power display down.
  2. Add standoff/insulator to prevent driver from shorting on back sheet.
  3. Replace driver with new driver.
  4. Address driver accordingly.  Follow How to Set Line and Face addressing on FL or DF 2000/4000 Gas Price displays?, DD2260801 for guidance on setting the Line/Face (addressing) settings.
  5. Power display back up.
  6. Set correct price. 

KB ID: DD2111872

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