RAK8212 - power issue

  • Hello guys,
    just received RAK8212 device.
    Tried to power on the device, but it seems the device does not work properly - VBUS / GND connector - I have applied from 4 to 8 volts - No voltage at Tantal capacitor till VBUS reaches 4,7 V. At oscilloscope I see meander shape of the output voltage. Next LDO does not work properly as well - output voltage (at next Tantal) is the same as input one.
    It seems, power part does not work properly at all. I am able to get proper power just putting input voltage (4V) at BAT pin.
    Please advise about this issue.
    Alexander A.

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