I took a knife to my laptop and cut several circuits on my laptop's
motherboard for reasons which will not be stated. I now want to fix it
up, but I don't know where to start. What materials do I need, and how
would I go about fixing these circuits. I know exactly where I made my
cuts, and I was thinking I could take some copper wire or something and
lay it down, maybe solder it on? But, I don't know if this is the best
way. Thank you for your time and interest.
First, model of Laptop? Your level of electronics knowledge?
If you're not trolling and serious about it, just replace the mobo.
Hopefully your cpu is in a socket, not permanently soldered in.
eBay is a good place to try for replacement.
Not looking for a replacement, as I already bought a new laptop. My
knowledge of electronics is all software side, I have never worked with
hardware like this before. I am serious about fixing it however. I
have taken most of the case off, a little is left, but I believe with a
few more screws it will come off quite nicely.
The link to my laptops model is:
Yeah, like I'm going to click into that link.
Here's what you need to do. Take a framing hammer. Fold the laptop shut.
Lay it on a concrete floor Give it three blows in the center just like you
are nailing home a 16d sinker.
That should fix it for good.
Glad to help.
Reminds me of when I bent about fifty pins while setting a CPU into a
BTW, I did fix it without the use of a hammer.
Get a short length of appliance power cord and cut about an inch of it off.
Then clean the coating off the traces you cut. Pull some strands of the fine
bare wires out of the 1 inch piece of cord. Use a small soldering iron and
"bridge" the cut traces with the wire. Cut off the excess. Using a decent
solder and some good soldering flux will make this a lot easier. Be sure you
have a good light and a magnifying glass to check your work. Clean the
repair with alcohol to get any remaining flux off. If you're real careful
you can clean the coating off the board and cut the excess fine wire with a
Yes I have repaired things like this. Depends on how much damage you've
done, how big the gaps are, how patient you are.
My method is like the above poster. I would add: I use a silver bearing
solder (if it's really fine I "draw down" the solder), extremely fine
tip, temperature controlled iron, I also try to stagger the repairs
soldering micro traces that are adjacent to each other will send you to
the funny farm. If you can't do that you can do micro wires point to
bridge the damage at a different point on the trace. I also have an
free arm magnifier. One like the dentist uses or micro surgeons use
would be indispensable.
We're talking about etch run traces of one fifth of a thousand inch and
up. Even nero surgeon would have trouble soldering them together. One
possibility is jumpering them from adjacent eyelet to eyelet of both sides.
Assuming that only top level traces were cut. Many motherboards have 6-12
layers in the PCB. You will not be able to fix inner level traces.
Assuming that no traces had critical timing signals which adding repair
traces will change the impedance and screw up timing thus cause crashes if
it did ever boot again.
Best bet is to try and salvage the LCD display for some kind of project or
Your chances of repairing your motherboard using my method are as good as
any. Probably better. When I got my last laptop, I got the new Circuit
City guarantee that covers ANY damage. I could do the hammer repair method
with MINE, and I would end up with a new laptop that worked perfectly.
I just thought it would work as well with yours.
Please keep us posted as to how those repairs on the microwire circuits are
coming. It will be very interesting. If you are able to repair it, you
should apply at NASA or at least at a major computer company. They will
have you doing A+ repair work at $8 per hour, but I bet they would bump you
up a bit when they see your abilities.
I don't know specifics of damages suffered. If it's on mobo itself I
never saw/heard anyone repairing them. I know components,ribbon type
flex cables can be replaced but if knife caused a deep scratch across
mobo and cause damage to etch runs, I don't think it is possible to
reconnect them. I can do SMT work, am mil-spec soldering certified in
my working days. But I don't know how to reconnect that hair line size
etch runs. Mobo is multi-layer as well. Not just double side.
How about a few pictures to show the damage.
On 16 Feb 2006 20:42:57 -0800, firstname.lastname@example.org wrote:
Chances are excellent from the little description you give that the board will
not be repairable by you or anyone else, regardless of skill level or equipment.
The reason is that the runs are not just on the surface. You have no doubt
nicked traces in other layers of the board. It doesn't take much! Can't be
repaired. Simple as that.
If you need this laptop to work again, your only hope is to find another of the
same model on Ebay with a bad hard drive or screen for very cheap, and swap out
If you want help, you have to fess up to why you would intentionally take a
knife to a laptop. Otherwise we can't help you.
No one can help you.
Unless you want to help yourself, of course.
How did it make you feel when you were cutting the motherboard?
Were you having any feelings about your own Mother at that point?
I've replaced soldered-on components on a laptop motherboard before. It
was kind of scary, but not all that hard to do. The hardest part was
getting to the mobo.
There's no harm in trying to bridge the cut traces to fix it; if it
doesn't work he can try to find another working system with a broken
screen etc. to strip for parts. That's often cheaper than buying a new
part, and he gets a spare keyboard and stuff out of the deal.
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