Dead modem

[kjm]

The lte modem in my gpy will no longer attach. I've checked the sim is current &

DL SYNCHRO STATISTICS
=====================
    Synchro state                         : DRX_SLEEP
    PPU SIB1 ACQ watchdog                 : 0
    Frequency Hypothesis RF  (Hz)         : -1000
    RSRP (dBm)                            : -122.70
    RSRQ  (dB)                            : -14.68
    Channel estimation state (Cell-spec.) : HIGH CINR
    Channel estimation state (UE-spec.)   : LOW CINR
    Channel estimation state (MBSFN)      : LOW CINR
    Channel estimation CINR               : 0.89
    Channel length                        : SHORT
  AGC
    AGC RX gain (dB)                      : 60.31
    RX PSD BO (dBFs)                      : -31.78
    RX PSD (dBm)                          : -125.68
    Noise level RS (dBm)                  : -119.08
    Digital gain (dB)                     : 18.00
    CINR RS (dB)                          : -3.62
  NARROWBANDS
    Last DL NB                            : Central
    Last UL NB                            : N/A
  AFC
    Frequency offset RF  (Hz)             : 549
    Frequency offset BB  (Hz)             : 0
  PBCH
    MIB received quantity                 : 63
    MIB timeout quantity                  : 0 

is the AT!="showphy" return. Is there a way to pin down what the problem might be? I'm not seeing any power out of the lte antenna, is there a way to test for a failed RF transmitter in the sequans?

[Elizar]

@kjm What about "power in" of the Gpy? There is a large power consumption spike when Gpy attaches to the net.

[kjm]

@elizar I got another gpy & it's OK, so either something has failed in the first one or there is some setting in there that's different.

[cdyrssen]

@kjm It seems like I'm running into a similar issue. I was wondering if you had any luck debugging if it was the modem that actually died or a settings issue?

[kjm]

@cdyrssen Was never able to revive that modem, it responds to firmware upgrades but never attaches. I use that gpy still for software development since the wifi is OK.

[rskoniec]

@kjm Any interest from Pycom (forum chat maybe)? Definitely they should react/be interested. Maybe you should reach @Xykon, @dan, @Bettina or @Fred.

[kjm]

@rskoniec Mate I'm paddling hard to keep my head above water with the continual state of pycom/sequans firmware flux without trying to follow up on a single failed piece of hardware. Typical of most hybrids I reckon the RF wafer is probably heaps more fragile than the digital stuff & a glitch down the antenna feedline or on the 5v rail has cooked it. Probably the only disadvantage of having the lte integrated with the smarts on the same board.