Posted: Fri Mar 24, 2017 14:41 Post subject: Tenda N3 serial pinout diagram
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
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Last edited by Krush206 on Sun Apr 28, 2019 1:46; edited 1 time in total
Joined: 08 May 2018 Posts: 14217 Location: Texas, USA
Posted: Sat Apr 27, 2019 16:13 Post subject:
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.
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.
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
Joined: 08 May 2018 Posts: 14217 Location: Texas, USA
Posted: Sun Apr 28, 2019 1:26 Post subject:
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.
Posted: Sun Nov 06, 2022 18:07 Post subject: Re: Tenda N3 serial pinout diagram
[quote="mcast"]
I connected the RX and TX pin as you shown, but not able to get any output when I start the router. I connected to a serial monitor and what I input returns as output and nothing else.
Also I checked if the pins TP1 and TP2 are in continuity but they are not connected to each other. I am unable to figure out the reason why it is happening.
If you have more information on this please share.
Posted: Mon Nov 07, 2022 1:26 Post subject: Re: Tenda N3 serial pinout diagram
[quote="deepakjoshi"]
Did you connect the negative pin (GND)? You can use the antenna shield, the red wire as shown in the picture. If it still doesn't work, try inverting the Tx and Rx. Make sure the processor is the same. Unfortunately I no longer have the router.
