BEFSR81 V.2 does not work anymore at 100Mhz

Discussion in 'Cisco/Linksys Wireless Routers' started by jgp69, Dec 28, 2008.

  1. jgp69

    jgp69 Addicted to LI Member

    BEFSR81 V.2 does not work anymore at 100Mhz => SOLVED

    BEFSR81 V.2
    Firmware 2.45.10 Jun 03, 2004

    I have used this router for years and it stops working suddenly.

    Link/Act led: Blinking constantly despite no network activity (or supposed one).
    Full/Col led: Steady ON
    100 led: Steady ON

    I disconnected the router from the network and connect it to a single computer.
    Then reset the router to its original settings.
    => not able to ping the router at
    => no access of course thru the browser.

    I changed the 2 electrolyc caps C011 & C021 (1000µF/16V)
    => same problem

    Set my network card down to 10MHz Half
    => This time I can ping the router and I have access to it thru the browser
    => Link/Act led now is nearly steady ON and blinks only when there is activity on the LAN.
    => Full/Col led: OFF and 100 led: OFF which seems normal

    Reload the latest firmware taking advantage of the 10MHz connection.
    Reset the network card again to 100MHz Full or Auto
    => Problem is the same as before, Link/Act led starts blinking constantly.
    => No more acces to the router.

    If one of you has encountered this type of behaviour, I will really appreciate your feedback?

    Thank in advance and Happy Holidays,
  2. mstombs

    mstombs Network Guru Member

    I'm sure it has lasted longer than a lot of other kit! Try replacing the PSU brick?
  3. jgp69

    jgp69 Addicted to LI Member

    Unfortunatly I did... no more luck!

    I know it is an obsolete product and I have already replaced it but I am just curious to understand what is happening...
  4. mstombs

    mstombs Network Guru Member

  5. jgp69

    jgp69 Addicted to LI Member


    Thanks mstombs for orienting me to capacitors.

    All caps on my BFSR81 are 10µF/16V except the 2 x 1000µF near the power plug.
    All are HERMEI brand.

    I connected the router to a computer and sent a ping -t instruction.
    As expected: No answer from the router
    As I did not know which one was the culprit and I was not really interested in changing all, I started to connect another capacitor (of 22µF) in parallel with existing ones. I did it on the circuit board side opposite to components, just establishing a contact by hand without soldering.
    The second try was the good one: Capacitor CD7 close to the switch chip (KENDIN KS8999) and from the 25MHz quartz.
    Immédiately, the led stopped blinking constantly and blinked only when receiving the ping from the computer.
    Ping and connection to router via web browser were operational.

    I changed the faulty capacitor for a 22µF I took off an used PCB and it seems the router is ready for a second life.

    Thanks to all contributors.

    Attached Files:

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