Color LaserJet Pro MFP M477fdn stuck at 'initializing' screen

[breuniga]

Product: HP Color Laser Jet Pro MFP M477fdn
Operating System: independent

What led to the problem:  I wanted to print an envelop. It did not start printing but gave me an error message that I should power cycle the printer, what I did. Unfortunately I do not remember the exact message.

Description:

When I power on my printer, it always gets stuck at Initializing screen. I already tried all the proposals I found in this great forum and other sources in the web without success.

My son had this problem before when I was on vacation and there it went away when I got back. The printer was off for a week or so.

But this time turning it off (unplug cable) for more than 10 hours doesn't help.
Among other things, I

• removed cartridge and reset
• NVRAM reset
• Power cycle without cartridge and paper tray
• Power cycle without cartridge, paper tray and external connections (LAN, phone, USB)
• tried to connect by LAN and USB - printer is not accessible

Assuming it is going to come down to a hardware issue but willing to try additional troubleshooting steps if anyone knows of any?

Thanks in advance

[Repairatrooper]

Most likely either the formatter (my first choice) or the Dc controller has failed and would need to be replaced.

[breuniga]

Many thanks for your fast answer.

I searched for the spare parts but could not find them. I guess it's not worth the hassle anyway.

What would you advise me to do?

[Repairatrooper]

Formatter should be part number CF378-60002.  Go to HP Partsurfer, enter your serial number and search to confirm. Always parts on Ebay or Amazon.

[breuniga]

Thanks  to your great help it was easy to find the part and a description how to unmount/mount the formatter 🙂

I recognized that the 3V-Battery on the formatter only has a voltage 2,75V. Do you think that this might be the root cause for the failure. Replacing the battery would be a lot cheaper than replacing the circuit board.