HP Printer Not Powering On Even Though Power Supply Tests Good? Here's What to Check Next

Question:
I have a similar power supply from an HP 3830. The printer suddenly stopped powering on. I tested the power supply with a multimeter and it outputs the correct voltage. Could something else be causing the issue?

Answer:

You've already taken an excellent first step by testing the power supply with a multimeter. If the power adapter is outputting the correct voltage, then yes-there is a strong possibility that the issue lies elsewhere, and the mainboard (logic board) is the most likely culprit.

Here's a deeper breakdown of what could be happening:

1. Mainboard Failure (Most Likely Cause)

Even if the power supply is delivering correct voltage, the printer won't power on if the mainboard cannot properly distribute or regulate that power. Common issues include:

• Burnt or damaged power regulation circuits (e.g., voltage regulators, capacitors)

• Shorted components on the board

• Failed power ICs that prevent startup

In many HP printers like the DeskJet 3830 series, the mainboard is responsible for converting incoming voltage into multiple levels required by different components. If this process fails, the printer may appear completely dead-no lights, no movement, no response.

2. DC Jack or Power Input Circuit Issues

Sometimes the problem isn't the power supply or the mainboard itself, but the connection between them:

• Loose or cracked DC jack

• Broken solder joints where the power connector meets the board

• Corrosion or debris blocking proper contact

Even if your adapter tests fine, the voltage might not actually reach the mainboard consistently.

3. Internal Short Circuit

A short somewhere in the printer can prevent it from powering on as a protective measure:

• A failed motor, sensor, or internal cable can cause a short

• The power circuit may shut down immediately when it detects abnormal current draw

4. Control Panel or Power Button Failure

Less common, but still possible:

• Faulty power button or control panel board

• Ribbon cable connecting the panel to the mainboard may be loose or damaged

In this case, the printer may actually be receiving power, but you're unable to trigger startup.

5. Firmware or EEPROM Issues (Rare)

In rare cases, corrupted firmware or EEPROM failure can prevent startup. However, this usually still shows some signs of life (like blinking lights), so a completely dead printer is more often hardware-related.

6. No Specific Error Codes

Since your printer isn't powering on at all, you likely won't see any error codes. Error codes typically appear only when the printer can at least initialize partially. A completely unresponsive unit strongly points to hardware-again, most commonly the mainboard.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. Because of this, we're not able to provide remote troubleshooting, suggestions, or support for printer repairs. However, we do offer an in-person evaluation and repair service through our local diagnostic facility. You can learn more here: printer repair service (https://bchtechnologies.com/printer-repair-service).

Due to high demand, we operate on a first-come, first-served basis, and it may take a few weeks before we can accept your printer for drop-off. Our services cover both full printer repairs and individual component work, with clear instructions provided. That said, we understand our pricing may not be the most budget-friendly option. For that reason, we strongly recommend exploring self-help resources first.

A great place to start is YouTube, including our channel homepage here: BCH Technologies YouTube Channel (https://youtube.com/@bchtechnologies). Use the search icon next to the "About" section to find videos on your specific issue. With hundreds of videos created over the past nine years, this is the fastest way to locate relevant content. You may also discover helpful videos from other creators that address similar problems.

Thank you again for reaching out and for your continued support. We truly appreciate it and are always here to help guide you in the right direction.