[Hwenray]

Hello, I'm trying to DIY Tangara again, but unfortunately, I've found that the 3V3 power supply is still not working properly. I checked the power supply and replaced the possibly damaged BD91N01NUX, but it still doesn't work. Sometimes the 3V3 outputs a voltage of about 0.4V (the 5V part is normal) (using USB-C power supply, no battery installed) (SWDRV on the BD91N01NUX is pulling down normally, and the CC interface has a voltage of about 0.4V). How should I continue to troubleshoot the problem? I need help, thank you.