Category: Troubleshooting
Products: Argon ONE V3
Platform: Raspberry Pi 5
Keywords: Argon ONE V3 HDMI USB-C daughterboard, Argon ONE V3 HDMI daughterboard, Argon ONE V3 USB-C daughterboard, Argon ONE V3 daughterboard faulty, Argon ONE V3 HDMI board faulty, Argon ONE V3 USB-C board faulty, Argon ONE V3 expansion board faulty, Argon ONE V3 HDMI USB-C board not working, Argon ONE V3 daughterboard not working, Argon ONE V3 no power, Argon ONE V3 incomplete circuit, Argon ONE V3 power circuit, Argon ONE V3 Raspberry Pi not powering on, Argon ONE V3 power test
Overview
This article applies only to the Argon ONE V3.
If you are testing the Argon ONE V3 HDMI USB-C daughterboard by itself and conclude that it is faulty because it does not power the Raspberry Pi, this is normal behavior and does not indicate a hardware defect.
The HDMI USB-C daughterboard is not designed to power the Raspberry Pi directly.
The Argon ONE V3 power system only functions after the entire case has been assembled and all internal connections are installed correctly.
Testing the HDMI USB-C daughterboard by itself is not a valid method of determining whether it is defective.
Why the Raspberry Pi Does Not Power On
Before concluding that the HDMI USB-C daughterboard is faulty, please confirm how the unit is being tested.
Are you attempting to power the Raspberry Pi using only the Argon ONE V3 HDMI USB-C daughterboard?
If so, this test is incomplete.
Unlike a standard USB-C connection, the Argon ONE V3 does not route power directly from the HDMI USB-C daughterboard to the Raspberry Pi.
Instead, the power passes through the internal circuitry of the Argon ONE V3 before reaching the Raspberry Pi.
For this reason, the Raspberry Pi will not power on if only the HDMI USB-C daughterboard is connected.
This behavior is expected and does not indicate that the daughterboard is defective.
How the Argon ONE V3 Power Circuit Works
The Argon ONE V3 requires all of the following components to be connected together before power can reach the Raspberry Pi:
- Argon ONE V3 HDMI USB-C daughterboard
- Argon ONE V3 power board
- 6-pin power connector
- Raspberry Pi board
These components form a complete power circuit.
If any one of these components is disconnected, the circuit remains incomplete and the Raspberry Pi will not power on.
Verify the Assembly
Before concluding that the Argon ONE V3 HDMI USB-C daughterboard is defective, verify that:
☐ The HDMI USB-C daughterboard is correctly installed.
☐ The 6-pin power connector is fully connected.
☐ The power board is installed.
☐ The Raspberry Pi board is fully seated.
☐ The case has been completely assembled.
Only after the complete assembly has been installed should the power supply be connected for testing.
Reseat the Internal Connections
If the Argon ONE V3 has been assembled correctly but still does not power on, reseat the internal connections.
It is recommended to remove and reinstall the following connections two or three times:
- HDMI USB-C daughterboard
- Raspberry Pi board
- 6-pin power connector
Ensure that every connector is pushed in completely.
The connectors are manufactured with tight tolerances, and a partially inserted connection may prevent proper electrical contact.
Why Tight Tolerances Are Important
The Argon ONE V3 uses a USB-C Power Delivery (PD) power supply.
Unlike a conventional USB power adapter, a USB-C PD power supply does not immediately output power.
Instead, it waits until a complete and valid power path has been established.
If the HDMI USB-C daughterboard, the 6-pin connector, the power board, or the Raspberry Pi board is not fully connected, the power negotiation cannot complete.
As a result, the Raspberry Pi will remain powered off even though the power adapter is connected.
This behavior is normal and should not be interpreted as a defective HDMI USB-C daughterboard.
Important
The inability of the Argon ONE V3 HDMI USB-C daughterboard to power the Raspberry Pi by itself does not indicate that the daughterboard is faulty.
The daughterboard is only one part of the Argon ONE V3 power circuit and must be connected to the power board and Raspberry Pi through the complete assembly before the system can operate correctly.
Frequently Asked Questions
My Argon ONE V3 HDMI USB-C daughterboard does not power the Raspberry Pi. Is it defective?
Not necessarily.
The HDMI USB-C daughterboard is not designed to power the Raspberry Pi by itself.
The complete Argon ONE V3 assembly must be connected before the Raspberry Pi can receive power.
Can I test the Argon ONE V3 HDMI USB-C daughterboard by itself?
No.
Testing the HDMI USB-C daughterboard by itself is not a valid diagnostic procedure because the Argon ONE V3 power circuit is incomplete.
Why doesn't the Argon ONE V3 HDMI USB-C daughterboard send power directly to the Raspberry Pi?
The Argon ONE V3 routes power through its internal power system before it reaches the Raspberry Pi.
The HDMI USB-C daughterboard is only one component of that power path and cannot operate independently.
I believe my Argon ONE V3 HDMI USB-C daughterboard is faulty because connecting the power supply does not turn on the Raspberry Pi.
If only the HDMI USB-C daughterboard is being tested, this is expected behavior.
Before diagnosing the daughterboard as faulty, fully assemble the Argon ONE V3, verify that the HDMI USB-C daughterboard, power board, 6-pin power connector, and Raspberry Pi board are all correctly installed, and ensure all connectors are fully seated.
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