HP M475dn: Display dark after boot, ? bright, ! + green spot flashing

Discussion in 'Printer Repair' started by riogrande75, Mar 1, 2020.

  1. riogrande75


    Mar 1, 2020
    Likes Received:
    After a couple of years good work my M475dn printer (CE863A) stopped working.
    After the bootup (bar in display from left to right) the display remains dark, ? is alightet and ! and green dot are flashing.
    So tried to reset NVRAM - no success.
    Then I tried to flash new firmware via USB - does not work either, even I get into the process.
    There is absolutely no respone from the LAN nor USB port (connected notebook with wireshark on it, no arp, broadcast, mac or ip,...), so I expected the mainboard as the faulty part.
    But after replacement same problem.

    Any idea what I could do next? Any possibility to get the real error code out of the machine?
    riogrande75, Mar 1, 2020
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