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HP Color LaserJet Managed E57540

Troubleshooting. Blank control panel

A blank control panel display can be caused by one or more of the following:

  • No power to the printer
  • Power supply has tripped (over-current/over-voltage/temperature issue)
  • Connectors on the formatter are not fully seatedTIP:The three LEDs on the formatter indicate that the printer is functioning correctly.
    HP recommends fully troubleshooting the formatter and control panel before replacing either assembly. Use the connectivity LED to troubleshoot formatter and control panel errors to avoid unnecessarily replacing these assemblies. See the LED diagnostics section in the printer troubleshooting manual.
  • Faulty component installed on the formatter (for example, memory DIMM or disk drive)
  • Control panel connectors not fully seated
  • Faulty formatter
  • Faulty control panel
  1. Verify that power is available to the printer. If the printer is plugged into a surge protector or uninterruptible power supply (UPS), remove it, and then plug the printer directly into a known operating wall receptacle (make sure that the wall receptacle provides the correct voltage and current for the printer).
  2. Make sure that the power switch is in the on position.
  3. Make sure that the fan runs briefly, which indicates that the power supply is operational.
  4. Make sure that the control-panel display wire harness is connected.
  5. Make sure that the formatter connectors are seated. Make sure the power switch is in the on position, and then verify that the heartbeat LED is blinking and that the connectivity LED is illuminated.
  6. Remove any external solutions, and then try to turn the printer on again.
  7. If the control panel display is blank, but the main cooling fan runs briefly after the printer power is turned on, try printing an engine-test page to determine whether the problem is with the control-panel display, formatter, or other printer assemblies.
    a. Disconnect all of the formatter connectors.
    b. Use a small pointed object to depress the test-page switch located on the rear of the printer.
    NOTE: The test page can only use Tray 2 as the paper source, so make sure that paper is loaded in Tray 2.
    c. If the engine test page prints, the print engine is operating normally (a failed engine test print page does not necessarily indicate that the print engine or DC controller is defective).
    d. Use the control-panel diagnostics to test the control panel. See the Control panel checks section in the printer troubleshooting manual. If the error persists, proceed to step 8.
  8. If the print engine appears to be correctly operating (the engine test page successfully printed) and the control panel is still blank, replace the low-voltage power supply (LVPS)
  9. If after replacing the LVPS normal startup noises and lights are still not present, replace the DC controller.
    NOTE: If the error persists after replacing these assemblies, escalate the problem to the Global
    Business Unit (GBU).
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