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E3000 hardware issues

Discussion in 'Tomato Firmware' started by corncrake, Dec 29, 2011.

  1. corncrake

    corncrake Networkin' Nut Member

    Hi all,

    Have two e3000 both using the 7483.2 version, one is stable as a rock but the other crashes 15 to 20 min after a reboot.

    By crash I mean no network access but the wifi continues to broadcast and the unit displays the correct lights.

    The problem seem to start after I took out a USB flash drive I was using but I have flashed many times since and the problem remains.

    Could this be overheating, it does feel hot? Other than clearing nvram whats the best way to completely clear the device setting and start from scratch?

    All suggestions welcome.

    (btw mods if you feel this is off topic please move to the relevant thread, not sure where to post)

    Thanks Corn
  2. Toastman

    Toastman Super Moderator Staff Member Member

    I haven't ever seen a problem from overheating myself, but you might want to quickly try clocking at a lower speed to see if it helps. Blow some air through it and see if that does anything too. One would expect both routers to behave similarly, so it might just be that.

    Best way to clear is to erase NVRAM (full) and reconfigure from scratch - use this method to save and restore config:


    It might be better to upgrade to the latest 7493, check the "erase all data in nvram mermory" box, if you're going to do this work anyway.
  3. corncrake

    corncrake Networkin' Nut Member

    Thanks Toastman,

    I also have a e3000 running vlan version with no problems so I'm guessing this is a hardware fault. Will update to 7493. Whats the best way to track the issue, remotely save the logs? Note to self, I will see if telnet still survives the crash.

    Thanks again, will update later Corn
  4. Toastman

    Toastman Super Moderator Staff Member Member

    Since it's apparently the WAN connection that goes down, you need to check that, the logs might show something. One thing you might try is swap the two routers of course. I think that's what I'd do to eliminate a hardware fault scenario.
  5. corncrake

    corncrake Networkin' Nut Member

    Hi Toastman,

    Yes swapped router and no issue with other unit. Have 7493 on the suspect unit and I have crossed the 30min without it falling over. Update.. Crashed again, but noticed when it crashed the power led is flashing (wireless, wan and ports are as normal)

    Some observations - even when I flash nvram after the update I still seeing old static ips in the IP Traffic log, would this mean I'm not clearing the nvram?

    On 7483.2 the router showed the CPU speed as 133 but now it's correct on the 7493 480?

    I get a debug in the log ever 2 min for cstats stoping / starting

    Thanks again, Corn
  6. jsmiddleton4

    jsmiddleton4 Network Guru Member

    "Could this be overheating, it does feel hot?"

    It is suppose to feel hot. It is by design taking the heat away from the inside and porting it to the outside for cooling.

    "I have flashed many times"

    As the others I suggest a full reset and then update to 7493.

    If after a full reset and a refresh to the latest firmware you still have the problem then I would see if its still under warranty. Something is snarfed on its "insides".

    "this mean I'm not clearing the nvram?"

    Most likely.
  7. corncrake

    corncrake Networkin' Nut Member

    Thanks jsmiddleton4,

    Have a day off so just want to see what went wrong with this unit, since the other two are rock solid on toastman. Have moved back to vanilla tomato and now all is well.

    Going through logs now and seeing what setting could be pushing it over the edge.

    Re heat... It's hotter that the others, nothing extreme, egg frying hot I'd say.

    Thanks corn
  8. jsmiddleton4

    jsmiddleton4 Network Guru Member

    "egg frying hot I'd say."

    That would be extreme.
  9. corncrake

    corncrake Networkin' Nut Member

    Hi All,

    Continuing the fun. I am running a zalman fan underneath the unit to keep it cool (not sure heat is an issue but fun making this -http://mikebeach.org/2011/02/28/cooling-the-linksys-e3000/)

    One question - I am trying to put the log files on a usb flash drive to record the logs as the unit fails - I think I have this correctly set this up but no logs are being recorded can ye have a look at these grabs? ( I have created the /logs folder )

    usb.jpg syslog.jpg
    fubdap likes this.
  10. corncrake

    corncrake Networkin' Nut Member

    Hi all,

    Is there a way (possibly through a script) that I can cut power completely to the USB port? I am using the port to supply power to a fan that I would like to switch on/off when needed.

    Thanks, Corn
  11. RonV

    RonV Network Guru Member

    I am not aware of any way to cut off power to the USB ports. Are you looking at doing thermal monitoring you may want to do something with a relay and thermal monitor:


  12. Catalin

    Catalin Addicted to LI Member

    That is a bit overkill. You can buy yourself a temperature controlled fan, really cheap. It has a thermistor hanging out of the fan's case and is auto adjusting the rpm.

    That's a better option, although I do not think it's necessary. If you install a large fan or reduce it's rpm by means of additional resistors you should have no problems with noise, heat or power consumption.
  13. corncrake

    corncrake Networkin' Nut Member

    Thanks RonV, Catalin,

    Yep that's the idea but initially I just wanted to see if I could script it based on CPU load.

    I had a problem with one of my e3000 and the solution was to place a 120 fan underneath it which fixes the overheating issue with this unit.

    Have a variable resistor unit somewhere around so will try this too.

    Thanks Corn
  14. RonV

    RonV Network Guru Member

    Since I love to tinker with electronics my first thought was to build it. But yes a fan control unit for a PC would work also except most won't fully turn off the fan. :D

    Sent from my Windows Phone 7 Mango using Board Express
  15. Toastman

    Toastman Super Moderator Staff Member Member

    The E3000 has come in for some flak about instability and overheating when pushed to the limit. I've moved some relevant posts here to clear up the other threads.

    Rather than add a fan (most cheap fans will run on sleeve bearings and fail due to poor lubrication after a while) I would personally reduce the clock speed a little, 10% or so maybe, that will reduce heat generation and probably won't be noticeable in most circumstances.

    A couple of 7500 rpm fans from Delta Electronics would also allow the router to hover a few inches off the desk and improve the circulation of air.

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