Tenda N3 serial pinout diagram

Post new topic   Reply to topic    DD-WRT Forum Forum Index -> Broadcom SoC based Hardware
Author Message
Krush206
DD-WRT Novice


Joined: 06 Dec 2016
Posts: 26

PostPosted: Fri Mar 24, 2017 14:41    Post subject: Tenda N3 serial pinout diagram Reply with quote
I have recently bricked my router (Tenda N3). I have checked its motherboard but I can't tell which pins are for RX, TX and GND. Could somebody please tell me which pins would be them?

Thanks in advance



N3-front.jpg
 Description:
 Filesize:  98.52 KB
 Viewed:  5077 Time(s)

N3-front.jpg




Last edited by Krush206 on Sun Apr 28, 2019 1:46; edited 1 time in total
Sponsor
Krush206
DD-WRT Novice


Joined: 06 Dec 2016
Posts: 26

PostPosted: Fri Mar 24, 2017 14:42    Post subject: Reply with quote
motherboard back


N3-back.jpg
 Description:
 Filesize:  87.84 KB
 Viewed:  5076 Time(s)

N3-back.jpg


Krush206
DD-WRT Novice


Joined: 06 Dec 2016
Posts: 26

PostPosted: Sun Mar 26, 2017 15:01    Post subject: Reply with quote
anyone?
darkkishi
DD-WRT Novice


Joined: 27 Apr 2019
Posts: 1

PostPosted: Sat Apr 27, 2019 8:25    Post subject: hi i wait is not too late Reply with quote
here let you a guide how to repair or debrick tenda router http://elrincontecnologicodejose.blogspot.com/2016/01/tutorial-recuperar-de-un-brick-router.html the pinout are those solder point near to the flash rom chip that have marks tp1-9
Krush206
DD-WRT Novice


Joined: 06 Dec 2016
Posts: 26

PostPosted: Sat Apr 27, 2019 14:21    Post subject: Re: hi i wait is not too late Reply with quote
darkkishi wrote:
here let you a guide how to repair or debrick tenda router http://elrincontecnologicodejose.blogspot.com/2016/01/tutorial-recuperar-de-un-brick-router.html the pinout are those solder point near to the flash rom chip that have marks tp1-9
This is for another model…
Are you sure it does work for N3? The pins diagram isn't even the same
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 8376
Location: Texas, USA

PostPosted: Sat Apr 27, 2019 16:13    Post subject: Reply with quote
Looks to be for serial recovery, but the pinout isn't very 'exact', however, the header looks the same between both models, perhaps "Tenda-specific", even. I think a serial to USB adapter for normal serial recovery as discussed many times in this forum may work instead of making one like that tutorial does. Would be better if they had included a graphic of the board pinout instead of a picture with wires hooked up to leave people guessing and possibly damaging their router. I did an extensive web search specific to the N3 model and came up short - mainly looking for pinouts.

I did, however find this:

http://www.devttys0.com/2012/11/reverse-engineering-serial-ports/

https://www.youtube.com/watch?v=_aedd8SUBgY
Krush206
DD-WRT Novice


Joined: 06 Dec 2016
Posts: 26

PostPosted: Sat Apr 27, 2019 20:44    Post subject: Reply with quote
kernel-panic69 wrote:
Looks to be for serial recovery, but the pinout isn't very 'exact', however, the header looks the same between both models, perhaps "Tenda-specific", even. I think a serial to USB adapter for normal serial recovery as discussed many times in this forum may work instead of making one like that tutorial does. Would be better if they had included a graphic of the board pinout instead of a picture with wires hooked up to leave people guessing and possibly damaging their router. I did an extensive web search specific to the N3 model and came up short - mainly looking for pinouts.

I did, however find this:

http://www.devttys0.com/2012/11/reverse-engineering-serial-ports/

https://www.youtube.com/watch?v=_aedd8SUBgY
Pretty difficult to find out which pins are RX and TX. I could find only GND (TP2). The other pins shows only 3.3V. I also wonder if it's possible to cancel the bootloader from loading the FW by just grounding the RX pin. I got a USB to TTL converter and a soldering iron but it would be less painful if that's possible, those pinouts are really tiny

EDIT: Actually, it looks like RX may be TP6. The multimeter logs a very low voltage, about 0.1V and 0.2V
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 8376
Location: Texas, USA

PostPosted: Sun Apr 28, 2019 1:26    Post subject: Reply with quote
Hopefully, you can figure it out, those pictures in the how-to that darkkishi posted may help, if you can trace out things... but, it would've been easier had they made a diagram of the motherboard solder points / header.
Krush206
DD-WRT Novice


Joined: 06 Dec 2016
Posts: 26

PostPosted: Sun Apr 28, 2019 20:11    Post subject: Reply with quote
Krush206 wrote:
EDIT: Actually, it looks like RX may be TP6. The multimeter logs a very low voltage, about 0.1V and 0.2V
Uh, this is weird, TP6's voltage increases if there is an ethernet cable plugged to the PC. But decreases if isn't plugged
mcast
DD-WRT Novice


Joined: 20 Jan 2021
Posts: 2

PostPosted: Wed Jan 20, 2021 1:23    Post subject: Re: Tenda N3 serial pinout diagram Reply with quote
I have a Tenda N3 too and recently I needed to access the serial pin. So these are the pins:

TX: TP2
RX: TP1
GND: There is no negative pin, so I used the antenna ground.

I made some mods to the status leds, so ignore that. Wink



TENDA_N3.jpg
 Description:
 Filesize:  517.56 KB
 Viewed:  351 Time(s)

TENDA_N3.jpg


mcast
DD-WRT Novice


Joined: 20 Jan 2021
Posts: 2

PostPosted: Wed Jan 20, 2021 18:38    Post subject: Re: Tenda N3 serial pinout diagram Reply with quote
I forgot some information:

Speed (Baud rate): 115200
Data bits: 8
Stop bits: 1
Parity: None
Flow control: None
Display posts from previous:    Page 1 of 1
Post new topic   Reply to topic    DD-WRT Forum Forum Index -> Broadcom SoC based Hardware All times are GMT

Navigation

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum