Sonata-One rev. 09 not powering up properly

Sonata Board
1

Hi,

I have a Sonata One rev. 09 here which collected dust for roughly a year, but I’m trying to get started with it now.

Unfortunately, when I plug it into a computer (I’ve tried several at this point), the following happens:

  • USB5V/VDD5V sags down to ~3.9V
  • VCC3.3 remains steady at 3.3V
  • VCC1V8 is at ~1.85V
  • VCCINT is at ~1.06V
  • The FT4232 does power up and enumerates correctly
  • RP2040 Vcore stays at ~1.13V, and the RP2040 does not boot (or at least, its USB device never appears. this happens regardless of whether SW9 is held when booting)
  • Sometimes (a 10-20% chance), the FPGA powers up and the “hello world” example is displayed (though the RP2040 still fails to enumerate on USB), but in most cases, nothing happens

Is this a power supply problem with my computers, or is my Sonata One defective somehow? How could this be fixed? (I’m OK with ordering components on my own and replacing them on the board via soldering.)

Thanks.