2821 console port not responding.

[k.tsanov]

I have two 2821 cisco routers im currently using for my homelab. Yesterday i was configuring the first one, i swapped the console cable to config the second one and when i swapped back to the first one it didnt respond at all. I rebooted it, tried all possible baud rates going from 75 all the way to 256000 without success. I also replaced the console cable to see if that might be the problem - no success. Removed the lids on both routers and swapped the boards that connect to the motherboard on one end and to the console port on the other - the first router was still not responding, while the second one worked perfectly with the board from the first one. So the physically the console port itself is not dead for sure.
In the meantime i noticed the first one is taking commands, so i erased and reloaded it and blindly enabled telnet, which works just fine. I checked the running config, cuz i was playing with the "no exec" command the other day, but there's nothing under "line con 0", which was pointed out as the most common reason why this might happen.

So basically the console port takes commands but doesnt echo.

I also wanna point out i can't see anything, nor rommon nor boot nor anything else.

I assume its a hardware related problem, but im not absolutely sure.

Any suggestions are appreciated. 

[balaji.bandi]

possible reason you have mentioned that "no exec" you were playing could be the reason not accept any commands.

can you clarify that, are you able to see the boot process on the console ? or nothing ?  

suggest to reset to factory default and start over, since its LAB

if you got telnet access please post below output :

show ver

show run | begin line con

show line

[k.tsanov]

I cannot see the boot process, its just a black screen.

Router#show ver
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 15.1(4)M10, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Tue 24-Mar-15 09:00 by prod_rel_team
ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)
Router uptime is 17 minutes
System returned to ROM by power-on
System image file is "flash:c2800nm-advipservicesk9-mz.151-4.M10.bin"
Last reload type: Normal Reload
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
export@cisco.com.
Cisco 2821 (revision 1.0) with 774144K/12288K bytes of memory.
Processor board ID FCZ113174T8
2 Gigabit Ethernet interfaces
2 Virtual Private Network (VPN) Modules
DRAM configuration is 64 bits wide with parity disabled.
239K bytes of non-volatile configuration memory.
250368K bytes of ATA CompactFlash (Read/Write)
License Info:
License UDI:
-------------------------------------------------
Device# PID SN
-------------------------------------------------
*0 CISCO2821 FCZ113174T8
Configuration register is 0x2102

Router#show run | begin line con
line con 0
line aux 0
line vty 0 4
password cisco
login
transport input telnet ssh
!
scheduler allocate 20000 1000
end

Router#show line
Tty Line Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
0 0 CTY - - - - - 0 0 0/0 -
1 1 AUX 9600/9600 - - - - - 0 0 0/0 -
* 514 514 VTY - - - - - 3 0 0/0 -
515 515 VTY - - - - - 1 0 0/0 -
516 516 VTY - - - - - 0 0 0/0 -
517 517 VTY - - - - - 0 0 0/0 -
518 518 VTY - - - - - 0 0 0/0 -
Line(s) not in async mode -or- with no hardware support:
2-513

[k.tsanov]

It seems that one GD75232 SSOP circuit, responsible for the IO, was dead. Tried replacing it and this time i got to see the output, however the input was not working..the following attempts to fix it completely destroyed the contact pins. Just some quick information for those that cant identify the problem.