• ×
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
  • ×
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
Guidelines

Featured blog article:

Locked

‎07-31-2026 09:35 PM

HP Recommended
Product: HP Color LaserJet Enterprise X55745dn Printer

The printer was connected to a power strip and had been working normally. At some point, it suddenly powered off and has never turned on again. There are no LEDs, including the Formatter board heartbeat LED, and the printer appears to be completely dead. I have also tried a different power cord but nothing.

All of the other devices connected to the same power strip continue to work normally. To rule out a power issue, I connected the printer directly to a wall outlet, but there was still no response. I also tested it in a different room with a different outlet, with the same result.I have also tried a different power cord but nothing.

The printer remains completely off. There is no fan activity, no LEDs, and no signs of life from any part of the printer.

As part of troubleshooting, I first replaced the LVPS, but there was no change. I then ordered and installed a new DC Controller, but the printer still shows no signs of power.

What would you recommend I check next? Should I replace the HVPS as well, or is there something else I should inspect before doing so?

 

Thanks in advance,

 

John

Category:
1 REPLY 1

‎08-01-2026 01:04 AM

HP Recommended

Refer to the repair manual here https://kaas.hpcloud.hp.com/pdf-public/pdf_9778320_en-US-1.pdf

 

It contains troubleshooting steps.

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.



Was this reply helpful? Yes No
Warning
Be alert for scammers posting fake support phone numbers and/or email addresses on the community.
If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation.
Didn't find what you were looking for? Ask the community
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.
-->