820-02020 board. 5V cycling on both ports

[astyrcz]

Hi! I'm having very similar problem with 820-02020 board. 5V cycling on both ports, the rear one, closer to UF400 0.11A - 0.28A and resetting meter, the front one constant 0.24A resetting meter in faster cycle. I have replaced already both CD3217 and this behavior changed a little - previously the front port had also changing current draw and slightly longer reset cycle.
These weren't chips pulled by me from another board. I got them on Ali 5pcs. Tried 4 of them, same effect.
The computer was bought as not working with info that worked on battery till it drained. Did not charge it back.

PPBUS_AON = 12V
USBC0_CC1 = 0.09V - both ports
USBC0_CC2 = 1.60V - rear port, 0.09V front port
SPI_UPC01 lines all measure 16ohm
SPI_UPC01_CLK = 0V
SPI_UPC01_MOSI = 0.16V
SPI_UPC01_CS_L = 3.42V
SPI_UPC01_MISO = 3.42V
PP3V3_UPC0_LDO = 3.42V
I do not have oscilloscope to check for data transfer.
PP1V8_S2 = 1.8V
USBC0_3V3LDO_EN = 0V
USBC1_3V3LDO_EN = 0V

Do you have any hints on this?

[mon2]

SPI_UPC01 lines all measure 16ohm

Can you clarify this measurement? How and where are you measuring these lines?

[astyrcz]

Can you clarify this measurement? How and where are you measuring these lines?

These were measured between far side of the resistor RF295, RF296, RF297, RF298 and corresponding pins of UF260.
That was done in resistance mode, no power to the board.
Next thing I measured the voltage drop to ground with USB-C plugged in and cycling 5V.