Blank or Black User Interface on the X7500, X5500 and X4500 Scanner Equipped MFD

 Document ID:SO4189
 
  Properties  

Problem

71 error; no display; cannot see display; display is black; user interface is blank; not copying; not scanning; touch screen responds but no display; can print but cannot perform scan functions

Solution


What you will see

The user interface (UI) or color touch screen is black or has no icon function buttons; however, if you press areas of the screen where the icons were previously, there is resultant activity.  In other words, if the user remembers where the icon for Copy should be and pushes that portion of the screen, the scanner scans and the printer prints as normal.

Probable cause

There are three cables (power, serial, and VGA)* leading into the user interface.  Also, there is a contrast knob on the left side of the control panel enclosure. 
The three likely causes of this anomaly are:  
  • The VGA cable has become disconnected or is faulty.
  • Someone has adjusted the contrast knob.
  • An LCD lamp failure is preventing the icons from appearing.

*7- pin (56P2042) power cable, 14-pin (56P2110) serial, and 15-pin (56P2112) VGA cable.

What to do 

Try adjusting the contrast knob to see if the graphical user interface (GUI) reappears.  Otherwise, call Lexmark Technical Support for further diagnosis and, if necessary, service.  

Still need help? 

Please contact Lexmark Technical Support for additional assistance.  NOTE:  When calling for service, you will need to know your scanner machine type and serial number. 
Please call from near the MFD in case the technician asks you to perform a task involving the device.  


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