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Forum Index : Microcontroller and PC projects : HDMI-USB reference board USB is not working
| Author | Message | ||||
| terekgabor Regular Member  Joined: 02/01/2026 Location: HungaryPosts: 99 |
Hello! I just had free time to solder a Pico 2 to HDMI-USB reference board. Everything is working expect USB. I can upload firmware, I can start is. I have HDMI output with logo screen and cursor. I attached junpers, red USB hub LED is active. But any USB keyboard I connect is not working. No green LED for the USB port where the keyboard is plugged in. Where to start the debug? Thanks! G@bor |
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homa Guru  Joined: 05/11/2021 Location: GermanyPosts: 627 |
G@bor, have you checked the solder joints from underneath? If in doubt, make sure you resolder them!! https://www.thebackshed.com/forum/ViewTopic.php?TID=17301&P=7#231405 Matthias Edited 2026-06-15 02:35 by homa |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 11479 |
Also, there was a bad batch of the hub chips shipped. If Matthias suggestion doesn't work then referring to the post he references remove R54 and R55. These are a potential divider that signals to the hub chip that there is a current overload. The bad chips see a valid current as overload. With the resistors removed it works. Can you program the firmware using the prog usb connector? If you can the USB connections are OK and the resistors are the next thing to test. You are connecting the jumpers 1 to 2 and 3 to 4? |
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