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Blank screen on HP laserjet multi funtion unit

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HP LaserJet 426FWD
Microsoft Windows 10 (32-bit)

Our HP LaserJet multi function unit has a blank screen. We still receive faxes and can print to it, but the touch screen is blank. There is a light on but no buttons to push. 

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We have tried troubleshooting how to get the information to return to the screen based on reading previous posts about the loss of information on the screen, but have not found a solution that works. Any suggestions?

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If the screen is blank but all functions work then most likely cause is a failed control panel. Part number B3Q10-60139. It might be the cable that runs from the formatter to the control panel as well PN C5F98-60104

 

In my experience if it was working fine and the panel just went dead then the panel not the cable is the problem.

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