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Linksys BEFSR81 ver.2 router/switch component ID?

Discussion in 'Electronic Repair' started by Bob Weiss, Mar 28, 2007.

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  1. Bob Weiss

    Bob Weiss Guest

    I inherited a Linksys BEFSR81 8-port ethernet router that a previous
    owner connected the wrong power adapter to. There is a 14 pin surface
    mount IC identified as "U7" in the front left corner of the board which
    had the magic smoke let out of it. I assume that this is just some cheap
    bit of glue logic, and would be worth attempting to replace before just
    trashing the whole unit. Unfortunately, the chip is so badly burned that
    I can't get any identifying numbers off of it. Everything else seems in
    good condition, and the unit even lights up and displays the config page
    correctly (but won't route any packets), so hopefully this will be an
    easy fix.

    Does anyone have access to a schematic for this unit, or have one that
    they could crack open and have a look at?

    Bob Weiss N2IXK
  2. Meat Plow

    Meat Plow Guest

    Not to be smart but what makes you think a schematic would exist for this
    thing? I doubt anyone anywhere ever did a component lever repair on this
    or any other Linksys unit.

    #1 Offishul Ruiner of Usenet, March 2007
    #1 Usenet Asshole, March 2007
    #1 Bartlo Pset, March 13-24 2007
    Pierre Salinger Memorial Hook, Line & Sinker, June 2004
  3. Bob Weiss

    Bob Weiss Guest

    The fact that someone somewhere designed the thing, and would want to
    document their efforts in a form understandable to others?

    I doubt anyone anywhere ever did a component lever repair on this
    Some Linksys products have quite a following in the "hardware hacker"
    community. And call me a tree-hugging hippie freak, but spending 10
    minutes soldering and a few cents for a part beats the hell out of
    dumping a nearly new unit (which would cost ~$80 to buy new)into a

    Bob Weiss N2IXK
  4. Meat Plow

    Meat Plow Guest

    Good luck. You might want to wade through the multitudes of Chinese or
    Taiwanese engineers who might care whether or not an end level tech
    completely unsupported by a large scale corporation wants to service this
    unit on a one time basis.
    Sorry IMO it's a throw away. If you eventually find service info and parts
    I would love to have the source(s)
  5. Bob Weiss

    Bob Weiss Guest

    Thanks a bunch Steve!

    Although the component designation numbers and layout are somewhat
    different, the '123, '125, and '14 all correspond with the circuitry in
    my unit, so my burned chip is most likely an 74HCT04. As I suspected, an
    el-cheapo logic gate which I should have in stock. Will swap it out and
    hope for the best.

    Thanks again!

    Bob Weiss N2IXK
  6. Bob Weiss

    Bob Weiss Guest

    An update:

    Chip replaced with 74HCT04, router working fine.

    Thanks, Steve!

    Bob Weiss N2IXK
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