12 Jul
1998
12 Jul
'98
3:37 a.m.
I have no experience with this, but I am willing to bet that it's the
ribbon cables that go from the circuit board to the LCD. I've known them
to cause this. First, check that the glue or tape that holds them to the
board didn't undo itself. If not, I have no idea how to replace them,
since they are attached right onto the LCD panel.
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No high voltage on an LCD, it's a low volt device
that the presence or
lack
of voltage causes the cystals to align or scatter,
causing balck or
clear.
There's two types and I don't need to go into
the diffs in field effect
and
the other.
Your outlook on what might be at fault is good. This is one of those
things
that someone that does this a lot could probably snap
their fingers and
have
the answer. I personally haven't had that much
experience with that
machine
and would have to dig in the schematics and do some
hands on to try to
isolate it.
Doug Yowza wrote:
> OK, hardware gurus, how about some remote diagnostic help: PowerBook
160
> (my first and only Mac), a bunch of black vertical
lines of varying
width
> on the LCD (different patterns on the two panels
that make up the
> display), but otherwise the display looks good (all the bits in the
right
> place).
>
> Video RAM? LCD controller? Cable problem on the laptop side? Cable
> problem on the LCD side? Bad LCD? Repair FAQ?
>
> I have a volt meter, a logic probe, a fear of high current, but I
enjoy
the
occassional high voltage zap. What's my next move?
-- Doug
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