Teseo-LIV3 output zeros for posistion

[DZhou.1]

Hi,

I have Teseo-LIV3 micro on our first version of production board. The output is all zeros for position:

Samples of Data: (Has antenna attached)

$GPRMC,003948.000,V,0000.00000,N,00000.00000,E,0.0,0.0,071214,,,N*71

$GPGGA,003948.000,0000.00000,N,00000.00000,E,0,00,99.0,100.00,M,0.0,M,,*6A

$GPVTG,0.0,T,,M,0.0,N,0.0,K,N*02

$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0*1E

$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0*1E

$GPGLL,0000.00000,N,00000.00000,E,003948.000,V,N*47

$PSTMCPU,18.91,-1,49*4E

$GPRMC,003949.000,V,0000.00000,N,00000.00000,E,0.0,0.0,071214,,,N*70

$GPGGA,003949.000,0000.00000,N,00000.00000,E,0,00,99.0,100.00,M,0.0,M,,*6B

$GPVTG,0.0,T,,M,0.0,N,0.0,K,N*02

$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0*1E

$GNGSA,A,1,,,,,,,,,,,,,99.0,99.0,99.0*1E

$GPGLL,0000.00000,N,00000.00000,E,003949.000,V,N*46

$PSTMCPU,25.97,-1,49*46

I have a dev board without antenna, positions are ok.

Can anyone give me some suggestions?

Thank You,

David

[Francesco Virlinzi]

Hi

has your board LNA+SAW?

Did you have a look to the layout suggestion in the LIV HW manual @ https://www.st.com/resource/en/user_manual/dm00399112.pdf?

Thanks

Regards

Francesco

[DZhou.1]

Thank you, Francesco.

David

[Tesla DeLorean]

Also check reporting in other fields, it says it doesn't have a fix, 0 N, 0 E are just default placeholders. See 'V' and 'N' flags

https://docs.novatel.com/OEM7/Content/Logs/GPGLL.htm#NMEAPositioningSystemModeIndicator

Suggests your RF section isn't functional.