ESP8266 Community Forum

- Sat Oct 05, 2019 7:38 am #84041 Hi!

I ordered recently few ESP-12F modules from https://pl.aliexpress.com/item/32349713 ... 5c0fE2gUrc. I received slightly different than the ones presented on the photo (they are branded by Doiting instead of AI Thinker).

When I powered on one of the modules I got following error:

Code: Select allFatal exception (0):
epc1=0x40100000, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x0
0000000
0x40100000: _stext at ??:?


I erased flash using esptool and uploaded some simple app from ESP8266 RTOS SDK examples. After powering up module is stuck at this point:

Code: Select all ets Jan  8 2013,rst cause:2, boot mode:(3,7)

ets_main.c

Tried also with another piece and it's all the same.

I used already few other modules (mainly ESP-12E) with the same circuit and never encountered such problem.
Does it mean that modules I've got are just fake/broken?
Maybe someone had similar problem?

Attachments

- Sat Oct 12, 2019 11:35 am #84139

Hi!

I ordered recently few ESP-12F modules from https://pl.aliexpress.com/item/32349713 ... 5c0fE2gUrc. I received slightly different than the ones presented on the photo (they are branded by Doiting instead of AI Thinker).

When I powered on one of the modules I got following error:

Code: Select allFatal exception (0):
epc1=0x40100000, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x0
0000000
0x40100000: _stext at ??:?


I erased flash using esptool and uploaded some simple app from ESP8266 RTOS SDK examples. After powering up module is stuck at this point:

Code: Select all ets Jan  8 2013,rst cause:2, boot mode:(3,7)

ets_main.c

Tried also with another piece and it's all the same.

I used already few other modules (mainly ESP-12E) with the same circuit and never encountered such problem.
Does it mean that modules I've got are just fake/broken?
Maybe someone had similar problem?

Hi buddy, yes exact same issue. Tried contacting via support mail but no real world solution. Any update on your side?

Regards,
Loce

Tutuapp ShowBox Kodi

- Sun Oct 13, 2019 4:39 am #84145 I had one too about a year ago. After I pried/desoldered open the tin shielding, I saw that a number of pins were shorted out on the ESP8266 chip.
I gave up on trying to fix that, although with lots of flux and luck it should be possible.
I accepted defeat and just used a propely working one.

- Tue Oct 15, 2019 9:21 pm #84175 Hi!

I had some issues recently with some doit.am ESP12 modules. Here's my story:

https://geekenargentina.wordpress.com/2019/10/08/esp8266-connectivity-troubleshooting/

TL;TR: To remove a wrong cap in the antenna was the solution

Please let me know if the same apply to you, I suspect a big batch of them out there.

Román