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Home > Archive > Electrical Engineering > February 2007 > LCD Screen (laptop) Issue can anyone help please???
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LCD Screen (laptop) Issue can anyone help please???
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| Batman2007 2007-02-26, 9:25 pm |
| Hi Guys,
After removing the cover to investage lines down my laptop lcd screen i have
found some strips (thin plastic strips looking like FILM out of a camera)
when i move my finger nail along one of these strips the screen checks
perfect, although when i remove my finger from that particular part the
lines apear again, what would be the best way of fixing the screen? can
anyone advise in this feild?
Regards,
Batman2007
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| Bob n. 2007-02-27, 5:25 pm |
| On Feb 26, 10:23 pm, "Batman2007" <batman2...@nospam.com> wrote:
> when i move my finger nail along one of these strips the screen checks
> perfect, although when i remove my finger from that particular part the
> lines apear again, what would be the best way of fixing the screen? can
Not clear what you are touching. The plastic film with conductors
usually has them visible, but you need to look closely. Sounds like
you are describing an open conductor that re-connects if it is not
flexed.
Sometimes the active flex-circuit is next to non-conducting plastic
film, intended either as insulation/protection for the conductor or as
mechanical support so that the flex conductor flexes in the right
place (gradually) instead of in the wrong place. Touching the support
film might also indirectly move the conducting film underneath.
Most reliable repair is to replace the flex-conductor with new part
from mfr. Flex conductors themselves can be repaired but generally
(unless you have really good repair materials) will no longer flex at
the point of repair. If the conductor is a printed-carbon or printed-
silver ink, then you need to use conductive ink or adhesive, perhaps
with a fine metal wire. If the conductor is copper foil, then it can
also be soldered if you are very careful. Using a razor-knife, the
insulating varnish needs to be removed from a length 5 to 10 times
longer than the width. A replacement piece of wire such as #45 can be
obtained from a one of the strands of the smallest high-grade stranded
wire you can find. (To use magnet wire you need to remove its
varnish; solder thru is too slow and will solder-thru the flex
connector!) A really fine soldering iron can be made from solid
copper wire like #30 wrapped around a regular 20W iron tip and
sticking out. And then you have to plan carefully and be real
quick. Use some paste flux taken from inside regular flux-core
solder, and then flatten down the solder.
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