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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 242 times
IMG_1814-1.jpg
Front connections
IMG_1814-1.jpg (817.49 KiB) Viewed 242 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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Re: Adafruit fona 3G american version no NET and PWR light

by larryhartman50 on Wed Apr 03, 2019 10:52 am

Adafruit,

I have two identical SIM5320 American Fona boards that my company purchased from Adafruit over past 9 months.

The first board failed shortly after purchase. Upon failure we discovered that the battery leads were reversed from the distributor. After correcting the battery leads, we ascertained the power regulator was too hot and replaced it. Once we were satisfied the circuits were correct, we attempted to reflash and were able to regain communications with the SIM5320 but still unable to connect to any networks afterward. When this did not revive the board we purchased the second board.

The second board failed sometime after 12 March--our last successful use. Yesterday was the first time it was powered up since 12 March with unlit PWR and NET indicators. This occurred after about 6 months of use in software development and testing. We are certain the board is connected properly and the battery leads are correct. The regulator is too hot to touch.

The following are voltages taken from the SIM5320 pins:

Pin 3 - 1.8 V
Pin 11 - 5.2 V
Pin 20 - 2 mV
Pin 38 - 3.8 V
Pin 44 - 2.6 V
Pin 49 - 20 mV
Pin 51 - 20 mV
Pins 62/63 - 3.8 V

We are at risk of missing a critical suspense due to this malfunction.

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

by larryhartman50 on Wed Apr 03, 2019 11:15 am

It is not the regulator that is hot to touch, but the battery charger. This is what we replaced on the first board.

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

by MrAnonim on Wed Apr 03, 2019 4:00 pm

I have bought a second board after the first one died and its been working fine for a couple of months now, same battery and same connections. I can assume that the first board was defective and suddenly died. Too bad i could not get it replaced, lost 100$

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

by larryhartman50 on Thu Apr 04, 2019 8:31 am

I flashed the second board with software directly from the simcomm sim5320 website: https://simcom.ee/documents/?dir=SIM5320

The result of reprogramming is that I now have serial communications with this board and can enter AT commands. The flash erased the International Mobile Equipment Identity and put the module into 'Factory Test Mode'. I was able to enter the International Mobile Equipment Identity with 'AT+SIMEI'. I was able to reset the board with AT+FUNC, and it is now in 'Offline Mode', it will accept the command to put it into 'full functionality, online mode' but remains offline.

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

by adafruit_support_mike on Fri Apr 05, 2019 1:10 am

@larryhartman50: Please start a new thread, with a photo showing your hardware and connections. 800x600 images usually work best.

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Please be positive and constructive with your questions and comments.