tenij000 said  

> option list
PicoMiteHDMI MMBasic RP2350A Edition V6.02.00

That's sadly still not the USB HDMI version.

If you are able to connect to the Pico using the Prog microUSB socket (USB5) to install MMBasic then the connections to the Pico have to be ok. The Pico's USB socket is wired directly to that one via the pads underneath.

The same connections feed the on-board USB hub vie CN4 links 1-2 and 3-4 so, if they are in place, then the USB hub must be connected.

Install the PicoMiteHDMIUSB firmware via the microUSB socket.
Unplug it - you don't want that lead now.
Use a USB-C lead to connect USB2 to the PC and switch the Pico on.
Start Tera Term
In the Tera Term text window go to Setup/Serial Port and make sure the baud rate is set to 115200 baud.
You should be able to find a serial COM port to connect to the Pico via the CH340C
You should then be in console mode
It might be a black screen so press Enter a couple of times
Enter OPTION RESET HDMIUSB and everything should set up automatically
You should be able to use a USB keyboard and HDMI monitor from this point
.
Edited 2026-03-01 20:51 by Mixtel90

  Quote  

if re try to put solder into hole under the usb hub chip tingy whill that connect maby a gpio pin

I think putting solder in that hole is to provide heatsinking for that chip.

  Mixtel90 said  

Did you solder the TP pads under the Pico?

The 3 pads he is reffering to have holes and can be seen in this pic. Two are at the top of the Pico footprint and one a little further down.
https://www.thebackshed.com/forum/ViewTopic.php?TID=17301&P=4#228486
You need to solder through those holes to connect to the USB pads on the bottom of the Pico.

Then you can load the HDMIUSB firmware again to see if it works properly.

If *any* firmware can be loaded via the microUSB socket then the pads must be ok. They are simply point to point wired. Pins 1 and 3 of CN4 are on the same connections.

You take the CN4 links off while programming anf put them back to connect the USB hub to the Pico. That microUSB isn't used for anything other than installing MMBasic.

now here also 1 red light is on r59 active

So what happened next?

it works now      problem was the led bihind the battery holder was rong way around

Are all the boards the same, or just the first unlucky one?