[Solved]TP-LINK TL-WR841ND v3.0 Bricked! Help me!

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toto2700
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Joined: 22 Aug 2010
Posts: 66

PostPosted: Sat Oct 30, 2010 13:38    Post subject: [Solved]TP-LINK TL-WR841ND v3.0 Bricked! Help me! Reply with quote
I flashed build 14896 onto my TL-WR841ND v3.0 and it bricked.

I found this guide (http://translate.google.com/translate?u=http%3A%2F%2Feko.one.pl%2Fforum%2Fviewtopic.php%3Fid%3D688&sl=pl&tl=en&hl=&ie=UTF-8) but it didn't help.



I have got a PL-2303 chip based USB to Serial Converter. I found the pinout of male RS232 and it showed that pin 2 = RD, pin 3 = TD and pin 5 = GND. So according to the guide above the pinout of P1

9 7 5 3 1
A 8 6 4 2

2 - Rx
3 - Tx
4 - Vcc (+3,3V)
5 - GND

I soldered the USB to Serial Converter pin 2(RD) to the router pin 3, the USB to Serial Converter pin 3(TD) to the router pin 2 and the USB to Serial Converter pin 5(GND) to the router pin 5

and finally I bridged R355 and R356.

Set up Putty to 9600 8-N-1 and NO flow controll (COM1). (115200 8-N-1-N didn't work either)

I don't get connection!

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TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt


Last edited by toto2700 on Wed Nov 24, 2010 19:08; edited 6 times in total
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toto2700
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Joined: 22 Aug 2010
Posts: 66

PostPosted: Sat Oct 30, 2010 13:40    Post subject: Reply with quote
What am I doing wrong?
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TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
toto2700
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Joined: 22 Aug 2010
Posts: 66

PostPosted: Sat Oct 30, 2010 17:35    Post subject: Reply with quote
any suggestion, idea?
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TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
cbaldan
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Joined: 10 Sep 2010
Posts: 64
Location: Chicago

PostPosted: Sat Oct 30, 2010 18:02    Post subject: Reply with quote
Dude, you are spamming a little too fast.

I can`t help since I unfortunatelly don`t understand on the pin out part, but I think there is some material that can help you out on this link:
http://wiki.openwrt.org/toh/tp-link/tl-wr841nd?s[]=wr841nd

Peace out!
toto2700
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Joined: 22 Aug 2010
Posts: 66

PostPosted: Sat Oct 30, 2010 18:54    Post subject: Reply with quote
Yes, I know that homepage but thanks for your help.
I'm sorry if I wasn't clear about the pinouts. Maybe this sketch will help you understand what I did there.




cbaldan wrote:
Dude, you are spamming a little too fast.

I can`t help since I unfortunatelly don`t understand on the pin out part, but I think there is some material that can help you out on this link:
http://wiki.openwrt.org/toh/tp-link/tl-wr841nd?s[]=wr841nd

Peace out!

_________________
TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
fyi2000
DD-WRT Guru


Joined: 04 Apr 2010
Posts: 642

PostPosted: Sun Oct 31, 2010 7:21    Post subject: Reply with quote
TP-Link TL-WR841ND - OpenWrt Wiki - Serial console
Quote:
Getting serial console is pretty standard fare. You need a MAX323 or similar level-shifter. The pinout on the router is RX - TX - GND - +5V (Power connector)
toto2700
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Joined: 22 Aug 2010
Posts: 66

PostPosted: Sun Oct 31, 2010 8:02    Post subject: Reply with quote
Yes, I know I've read that. But it is valid for wr841nd v5.X I have v3.0 and this is completely different.

fyi2000 wrote:
TP-Link TL-WR841ND - OpenWrt Wiki - Serial console
Quote:
Getting serial console is pretty standard fare. You need a MAX323 or similar level-shifter. The pinout on the router is RX - TX - GND - +5V (Power connector)

_________________
TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
fyi2000
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Joined: 04 Apr 2010
Posts: 642

PostPosted: Sun Oct 31, 2010 15:51    Post subject: Re: TP-LINK TL-WR841ND v3.0 Bricked! Help me! Reply with quote
toto2700 wrote:
Set up Putty to 9600 8-N-1 and NO flow controll (COM1). (115200 8-N-1-N didn't work either)

Could it be COM3? Check it with Windows device manager.
toto2700
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Joined: 22 Aug 2010
Posts: 66

PostPosted: Sun Oct 31, 2010 16:31    Post subject: Re: TP-LINK TL-WR841ND v3.0 Bricked! Help me! Reply with quote
I figure my problem is the USB to Serial Converter. I measured 6.38V between the pin 3(Transmit Data) and pin 5(Ground) (RS232 DB9). I don't understand why not 3.3V or 5V. My Siemens M35 cellphone data cable landed in the trash years ago. It would be great right now because it used 3.3V.

So I need to find the right TTL converter which is suitable for RX - TX - GND - +3.3V communication.

If I have any progress I'll let you know.

fyi2000 wrote:
toto2700 wrote:
Set up Putty to 9600 8-N-1 and NO flow controll (COM1). (115200 8-N-1-N didn't work either)

Could it be COM3? Check it with Windows device manager.

_________________
TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
toto2700
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Joined: 22 Aug 2010
Posts: 66

PostPosted: Sun Oct 31, 2010 17:56    Post subject: Reply with quote
According to wiki "A cable with a Prolific 2303 works fine."
http://www.dd-wrt.com/wiki/index.php/Serial_port_pinouts#TP-Link_TL-WR941ND_ver.3

My USB to Serial Converter is based on Prolific 2303HXD. Why isn't my USB to Serial Converter working? And why I measure 6.38V between the pin 3(Transmit Data) and pin 5(Ground) (RS232 DB9) instead of 3.3V?

(I'm really sorry if I'm asking stupid questions but I'm totally new to these things like unbrick routers, get serial access to the router)

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TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
LOM
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Joined: 28 Dec 2008
Posts: 7632

PostPosted: Mon Nov 01, 2010 0:36    Post subject: Reply with quote
toto2700 wrote:
Yes, I know I've read that. But it is valid for wr841nd v5.X I have v3.0 and this is completely different.

fyi2000 wrote:
TP-Link TL-WR841ND - OpenWrt Wiki - Serial console
Quote:
Getting serial console is pretty standard fare. You need a MAX323 or similar level-shifter. The pinout on the router is RX - TX - GND - +5V (Power connector)


No it is not different - all the routers are using 3.3V TTL level signals.
You can not use the USB<->Serial cable that you buy in the computer shop, that one has RS232 signal levels.
You need a cable intended for TTL serial and not RS232 serial.

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fyi2000
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Joined: 04 Apr 2010
Posts: 642

PostPosted: Mon Nov 01, 2010 2:15    Post subject: Reply with quote
toto2700 wrote:
My USB to Serial Converter is based on Prolific 2303HXD. Why isn't my USB to Serial Converter working? And why I measure 6.38V between the pin 3(Transmit Data) and pin 5(Ground) (RS232 DB9) instead of 3.3V?

When did you get that USB to Serial Converter? How does it look like?
How do you connect it to the board?
Take a photo so we can see how you did it.

BTW, use a multimeter to measure the voltage of Vcc, Tx and Rx of the serial console and check if Tx varies while power the router on.

DD-WRT Forum :: View topic - HELP!!!! SEMI BRICKED ROUTER
Siemens M35 cell phones cable connector pinout
toto2700
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Joined: 22 Aug 2010
Posts: 66

PostPosted: Mon Nov 01, 2010 7:06    Post subject: Reply with quote
Thanks. I didn't know that. Do you think is this gonna work with the router? http://cgi.ebay.co.uk/USB-2-0-UART-TTL-6PIN-Module-Serial-Converter-CP2102-/170504213285?pt=UK_Computing_CablesConnectors_RL&hash=item27b2d7d325

LOM wrote:

No it is not different - all the routers are using 3.3V TTL level signals.
You can not use the USB<->Serial cable that you buy in the computer shop, that one has RS232 signal levels.
You need a cable intended for TTL serial and not RS232 serial.

_________________
TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
LOM
DD-WRT Guru


Joined: 28 Dec 2008
Posts: 7632

PostPosted: Mon Nov 01, 2010 8:23    Post subject: Reply with quote
toto2700 wrote:
LOM wrote:

No it is not different - all the routers are using 3.3V TTL level signals.
You can not use the USB<->Serial cable that you buy in the computer shop, that one has RS232 signal levels.
You need a cable intended for TTL serial and not RS232 serial.


Thanks. I didn't know that. Do you think is this gonna work with the router? http://cgi.ebay.co.uk/USB-2-0-UART-TTL-6PIN-Module-Serial-Converter-CP2102-/170504213285?pt=UK_Computing_CablesConnectors_RL&hash=item27b2d7d325



Yes that one will be fine.

_________________
Kernel panic: Aiee, killing interrupt handler!
toto2700
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Joined: 22 Aug 2010
Posts: 66

PostPosted: Mon Nov 01, 2010 10:30    Post subject: Reply with quote
I ordered a NOKIA USB Data Cable CA-42. I hope this is gonna work too.

I used a multimeter to check the voltages. The pinout of P1 is

9 7 5 3 1
A 8 6 4 2

2 - Rx
3 - Tx
4 - Vcc (+3,3V)
5 - GND

(Above the 1 there is a triangle)

5 is Ground
I measured 3.29V on pin 4 and
3.29V or 0V on pin 3
0V on pin 2.

I think this is a pretty good sign there is still hope for recovery.

Here's a picture of my USB to Serial Converter

fyi2000 wrote:

When did you get that USB to Serial Converter? How does it look like?
How do you connect it to the board?
Take a photo so we can see how you did it.

BTW, use a multimeter to measure the voltage of Vcc, Tx and Rx of the serial console and check if Tx varies while power the router on.


DD-WRT Forum :: View topic - HELP!!!! SEMI BRICKED ROUTER
Siemens M35 cell phones cable connector pinout

_________________
TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
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