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‎07-28-2024 04:22 AM

HP Recommended
Operating System: Microsoft Windows 11

I have a HP Color LaserJet Pro MFP M477fdw printer. After turning on, the screen works with white bar appearing and all the motors, fuser etc. works. However, after about 5 secs, the screen is black. It doesn't receive any print data from USB and LAN cable too. What could be the possible problem? I guess some hardware part is defective, but I am not sure which ones.

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1 ACCEPTED SOLUTION

Accepted Solutions

‎07-28-2024 10:23 PM

HP Recommended

Based on units I have serviced, if you have no response from USB or network and the screen is blank then the formatter is the issue. 

If you find the information provided useful or solves your problems, help other users find the solution easier by marking my post as an accepted solution. Clicking "yes" on "was this reply helpful" also increases the chances that this solution will help others.
I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.



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5 REPLIES 5

‎07-28-2024 12:27 PM

HP Recommended

Turn the printer ON with paper loaded in tray 2, when the printer finishes the rotation and the screen goes black open and close front door 4 times. The printer should print a single page with colour stripes, if it does then you have a defective mainboard.




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‎07-28-2024 06:38 PM

HP Recommended

Thank you for professional reply. I tried your method exactly. In my case, there are some sounds goes on in tray 2, seems it wants to pick up paper, but it does bot print anything. My guess is that the formatter (logic board) became defective. Because there is no communication (lan, usb, display) possible with printer, but fuser, motors are working (mainboard maybe therefore works too). What do you think?

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‎07-28-2024 10:23 PM

HP Recommended

Based on units I have serviced, if you have no response from USB or network and the screen is blank then the formatter is the issue. 

If you find the information provided useful or solves your problems, help other users find the solution easier by marking my post as an accepted solution. Clicking "yes" on "was this reply helpful" also increases the chances that this solution will help others.
I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.



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‎07-29-2024 02:02 AM

HP Recommended

Yes I also guess so. But, the screen at first 7-8 secs (after turning on) shows something (the white bar is filling) and then everything disappears and it is black.

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‎08-09-2024 05:53 AM

HP Recommended

After successfulyl installing another working formatter (logic board - CF379-60001), the printer works again perfectly. Thanks

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