Flying ADC BMS - incorrect voltage readings and two not starting up

[Jacobsmess]

I'm getting incorrect voltage readings on 3 of my boards and 2 dont even power up.

I swapped headers and this may have led to the issue.

I've checked Fet readings and resistors. The 3 working boards I have appear to match the 3 that are giving incorrect readings and the 2 that won't start.

I can flash firmware to all via the STLink, all are running the 0.25.25 FW and see flashing LEDs on all of them after doing so.

I've got continuity from pins and traces seem to be unbroken. I've checked diodes and they seem to be ok... is there any guidance anyone can offer in getting these working again?

Thanks

[johu]

The 3 working boards I have appear to match the 3 that are giving incorrect readings and the 2 that won't start.

all are running the 0.25.25 FW and see flashing LEDs on all of them after doing so.

Contradiction Please specify "won't start"

[Jacobsmess]

Sorry so I've got 10 boards in total.
4 (not 3 as previously stated) work fine
3 give incorrect voltage readings but otherwise appear to operate fine, no errors.
3 that don't power up at all using the 12V connection header (and enable etc.) But can be connected to using an STLink and the LED lights up when connected to and flashes after the FW is written.

I think the incorrect voltage readings were present prior to me swapping the headers.

[Jacobsmess]

Images of 3 of the boards spot values that are presenting incorrect voltages....
U5-U8

U2-U3

U2, U5, U10-U11

[Jacobsmess]

Any ideas on where to look to address this? Thanks