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Have a LaserJet P3005 printer. When switched on the indicator lights come on and stay on as if it's ready to print, but the LCD remains blank and no longer displays anything (normally displays READY) either during POST or when it is Ready. Printing fails.
Tried a cold reset holding the Check button during POST. Indicator lights blinked and then went solid. Nothing on screen.

I've walked through the HP troubleshooting online and in the manual. But it basically stops at turn the machine off and then back on.

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Abuzar_3 commented: hp laserjet p3005 no display +0

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Short diagnostic note for and others with a blank P3005 control‑panel.

HP’s official troubleshooting for a blank control panel lists several causes besides a failed formatter — bad power/ECU, a loose control‑panel connector, installed DIMM or EIO cards, or a bad formatter — and shows the isolation steps used below. See HP’s P3005 blank‑display guidance and the P3005 service manual for the same procedure. ()

Quick isolation checklist (do these in order; disconnect mains before opening covers):

  1. Power sanity: unplug the printer for ~60 seconds and plug directly into a known live wall outlet (not a strip/UPS).
  2. Power‑on check: when powered, does the main fan run briefly? If the fan does not run, the ECU/power supply could be at fault.
  3. Remove add‑ons: remove any EIO/JetDirect cards and any extra DIMM(s), then power cycle. HP specifically recommends this to rule out card/memory boot failures. (manualzilla.com)
  4. Reseat control‑panel cable: with power removed, open the top covers and gently unplug/reseat the flat ribbon from the control‑panel assembly (RM1‑3725) and the formatter. A loose connector commonly causes a blank LCD. (manualzilla.com)
  5. Engine test: if the control panel is blank but the engine still prints an engine/self test, the issue is usually the control panel or its cable. If nothing prints and the panel is blank, the formatter or PSU/ECU is more likely. (manualzilla.com)

If those checks point to the formatter, replacement boards for the P3005 are sold (OEM/reman Q7847‑60001 / Q7847‑61003 families), but replacing a formatter often requires service‑menu steps (engine cycles, serial/service values) described in the service manual — factor those into repair cost vs. replacement. (getthatpart.com)

If the above isolation still leaves the display blank, the printer will require service (formatter/ECU replacement or a control‑panel swap). The HP support page and service manual show the same escalation path. ()

Helpful links:

(Cold reset having already been attempted, the next value comes from the physical checks above — especially removing EIO/DIMM and reseating the control‑panel cable.)

Member Avatar for Kurtismonger

From what I can find it appears to be a defective formatter board.

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