# Linksys BEFSR81 ver.2 router/switch component ID?

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#### Bob Weiss

Jan 1, 1970
0
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?

73,
Bob Weiss N2IXK

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#### Meat Plow

Jan 1, 1970
0
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?

73,
Bob Weiss N2IXK

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

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#### Bob Weiss

Jan 1, 1970
0
Meat said:
Not to be smart but what makes you think a schematic would exist for this
thing?

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 landfill... Bob Weiss N2IXK M #### Meat Plow Jan 1, 1970 0 The fact that someone somewhere designed the thing, and would want to document their efforts in a form understandable to others? 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. 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
landfill...

Bob Weiss N2IXK

Sorry IMO it's a throw away. If you eventually find service info and parts
I would love to have the source(s)

B

#### Bob Weiss

Jan 1, 1970
0
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

B

#### Bob Weiss

Jan 1, 1970
0
An update:

Chip replaced with 74HCT04, router working fine.

Thanks, Steve!

Bob Weiss N2IXK

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