If the only thing you cut was solder-traces on the surface, than the
only thing you should need is a soldering iron, more solder, and
thorazine. If you hit any components, even just the pins, you should
replace the entire component.
If you did not violate the integrity of the pre-preg dielectric material
(this is the material the the copper is etched onto) to the inner
layers, then chances are that it is repairable.
Gluing wires down and trying to solder them is one idea but this is not
structurally sound because theses traces are very fragile. You would
probably create another stress point along the trace and then it would
break there. This is almost next to impossible to do.
If you can follow the trace from both ends and find vias (these are
holes that transition the circuit from one layer to another) you could
attach a wire to these vias and bridge the cut. That might work.
However, you need really thin wire to do this (30 AWG or smaller)
Either method you will need:
A microscope, conductive epoxy, solder mask, an exacto knife and a
Links to these products:
This is my preferred method.
First, carefully scrape back the existing solder mask (the green coating
on the board usually but can be some other color) of the existing
circuit trace to expose some good copper, and also the around affected
area where the epoxy will be applied. Be careful not to cut anymore
traces as they are probably bunched tightly together.
Clean with denatured alcohol. Let dry.
Place a small bead of the epoxy using the supplied syringe to bridge the
gap of the cut.
Let dry, then apply the solder mask
This is a tough job and chances are it might not work. You have alot of
variables against you to start.
I have done this before on other types of cards but I had much thicker
traces to deal with. For me, this has worked on 8 mil traces and
larger. Circuit traces on a mobo are typically 4 mils or less, that's
Good luck :)
Depending on the traces that you cut (primarily the speed of signals
sent along those traces) you may not be able to repair them. By adding
additional length/resistance/capacitance to the trace, the repair could
change the way signal travels on the trace. In principle, data
travelling at very high speeds on the repaired traces could be
unreliable. You can go ahead and try if you like, but even if you
repair them correctly, there is no guarantee that the motherboard will
work correctly. Hopefully the traces you cut were low speed or power
unless he is good at soldering PC boards he is probably better off
finding a local private computer tech and getting his or her opinion.
We have one of those here, my friend nick who has got me out of a
couple jams cheap.
although I never did anything like this.worst was connections pulled
loose and I had no idea where they went:(
my mom got mad once and smashed a radio:( I am still looking for one
like it. Today its a collectible model:( Worth hundreds of bucks!
!!!!!!!!!! I SERIOUSLY SUGGEST THE ORIGINAL POSTER SEEK COUNCLING
OR ANGER MANAGEMENT CLASSES!!!!!!!!!!!!!!!!!!
before something even worse occurs
-> 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.
I've heard that duct tape can fix just about anything.
typical repair would be to take a small piece of wire and jumper over
the cut traces, soldering it in on either end. You may need to clean
off the solder locations with nail polish remover to get off any
protective coating. Use a hot air gun and not a soldering iron if you can.
"Then said I, Wisdom [is] better than strength: nevertheless the poor
Try cutting some masking tape & taping outside the trace for about 1/4" on
either side of the break. Clean the trace as well as you can. Paint on a
little conductive paint or "rear window defroster repair" compound. Have
used this successfully on CPU's & keyboards.
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