> -----Original Message-----
> From: PowerBooks [mailto:[EMAIL PROTECTED]]On Behalf Of
> James Greenidge
> Sent: Friday, October 11, 2002 4:36 AM
> To: PowerBooks
> Subject: Strange comb-like lines on PB 190 screen
>
>
> Greetings All:
>
> I recently acquired a PB 190 that I'm gradually maximizing as a
> backup to my 6320.
>
> After a month of use a strange anomaly has occurred in the form of
> thin vertical comb-like lines spaced about 5mm from another across
> the full width of the screen and extending up almost
> exactly half the
> height of the screen. Earlier it was an infrequent
> occurrence that I
> cured when I discovered that zapping the PROM was enough to
> rid of it
> but now it's become persistent and annoying. It's most prominent in
> full color mode and almost invisible in 16 gray mode. I think it
> usually occurred before when I actually turn off the PB 190
> because I
> rarely do, as I usually just let it sleep. Now it's not going away
> any more, zapping or not.
This could be one of 2 things,
1) display cable loose/damaged
2) screen multiplexer chip faulty
The first one is quite easy to check, ensure that both ends are
plugged in firmly, and see if the symptoms change when you flex the
cable,
if not then try gently squeezing along the top of the display housing,
if this cures it then there is probably a dry joint on one of the
multiplexer chips.
If neither help then it is probably new screen time.
NB it could possibly be Vram but in my experience it is usually the
screen.
Ben.
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