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Adafruit fona 3G american version no NET and PWR light
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Adafruit fona 3G american version no NET and PWR light

by MrAnonim on Mon Jan 07, 2019 12:03 pm

Hi, i purchased an adafruit fona 3G (Sim5320) from digikey on November 6, 2018. I set it up with an arduino nano in order to send temperature readings over sms. I connected it to the 3.7 Li-Po battery and everything was working fine. i managed to upload the example codes from adafruit and i was able to communicate with the fona until a couple of days ago. The fona stopped working all of the sudden and the Net and PWR LED's do not turn on anymore. I tried disconnecting everything, resetting the fona, rewiring all the connections and i even tried a new arduino board no luck so far. When i measure the input voltage from the battery i get 4V so i know that is working. The wiring setup is in the attachements. The fona module is receiving 5V from the Arduino board and the battery leads are plugged in the right way. I checked that before plugging in the battery.
Any suggestions to what else i can try to troubleshoot it? Thank you!
Fona Pinout:
Vio to 5V - Took extra care to make sure its connected
GND to GND
Key to GND - Took extra care to make sure its connected
RX to Digital 2
TX to Digital 3
RST to Digital 4
Attachments
IMG_1817-1.jpg
Back of the board
IMG_1817-1.jpg (523.6 KiB) Viewed 123 times
IMG_1814-1.jpg
Front connections
IMG_1814-1.jpg (817.49 KiB) Viewed 123 times

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Re: Adafruit fona 3G american version no NET and PWR light

by adafruit_support_mike on Tue Jan 08, 2019 2:06 am

The photos show no SIM in the carrier on the back of the board, which will be an obvious problem.

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Re: Adafruit fona 3G american version no NET and PWR light

by MrAnonim on Tue Jan 08, 2019 2:24 am

Even with a sim card inserted the module does not turn on at all , pressing the PWR key button does not do anything and even connecting the key pin to ground for a couple of seconds does not turn the module on. Update: i tried plugging in a new batter into the module( verified that it is the right polarity) but no luck. I think its the board at this point :(

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Re: Adafruit fona 3G american version no NET and PWR light

by adafruit_support_mike on Wed Jan 09, 2019 3:25 am

That's definitely possible, but let's verify board power to nail it down.

What voltages do you see on the BAT and VIN pins?

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Re: Adafruit fona 3G american version no NET and PWR light

by MrAnonim on Wed Jan 09, 2019 10:58 am

On Bat voltage= 4.10V, Vin( im assuming thats Vio) its 4.6V.

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Re: Adafruit fona 3G american version no NET and PWR light

by adafruit_support_mike on Thu Jan 10, 2019 5:37 am

Yeah, that confirms power to the board.

I'm afraid that one is probably dead.

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Re: Adafruit fona 3G american version no NET and PWR light

by MrAnonim on Thu Jan 10, 2019 7:34 am

hmm i was afraid of that. I don't understand how it died though it was just sitting in a box connected to a battery, once that battery needed a recharge the module would not turn on anymore, but the Arduino module is just fine. I would love to know what died on the board and replace a couple of components, but i measured many points following the boards PCB schematic and everything seems fine except for the power going to Netstat and power stat. What would be the next step from here? Would it be possible to get a replacement?

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Re: Adafruit fona 3G american version no NET and PWR light

by adafruit_support_mike on Sat Jan 12, 2019 4:28 am

I'm afraid I can't authorize a replacement. We cover production defects and early component failures within the first 30 days after purchase, neither of which apply here.

It sounds like something has failed inside the GSM module, which is beyond normal means of repair.

The most likely cause of failure would be static electricity. We're in that season, and sparks don't become visible until they get up to about 3kV.

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Re: Adafruit fona 3G american version no NET and PWR light

by MrAnonim on Sat Jan 12, 2019 9:10 am

I see, is there anything that can be done other then a replacement, because i am stuck with a product that worked well until it died within 2 months. And its a bit frustrating because its expensive too. Ordering it from digi-key it came out to 130$. Thank you !

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Re: Adafruit fona 3G american version no NET and PWR light

by adafruit_support_mike on Sun Jan 13, 2019 1:12 am

I don't have any other options.

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Please be positive and constructive with your questions and comments.