Kelly & Brian,
Well, ya got me curious if I have been living on a fault line for the last 15 years. I took a
look at the 3 1/2 digit LCD we have been using. We have over 100,000 of these units in the
field. The area where the legs are clipped to the backplane glass is coated. The area
between the backplane and the cell glass has a rather heavy fillet of some type a sealant.
It is possible that this sealant is protecting the ITO (indium tin oxide) traces that come off
the backplane and out to the attachment points, from attack and contamination.
Gary Camac
"Kelly M. Schriver" wrote:
> Brian & All -
>
> Any chance that these after the fact problems might have their origin with
> condensed solids which have later become activated to some degree from
> moisture? I've been there a few times, and it seems to be one of those
> nasty, hard to pin down ghosts of our industry.
>
> Regards - Kelly
>
> -----Original Message-----
> From: Brian Ellis <[log in to unmask]>
> To: [log in to unmask] <[log in to unmask]>
> Date: Tuesday, February 20, 2001 1:22 AM
> Subject: Re: [TN] components prohibited from aqueous wash
>
> >Gary
> >
> >I have had 2 or 3 clients having problems with LCDs a few months after
> >cleaning, although no one has ever given me an explanation. Just
> >practical experience. In the light of your experience, perhaps I should
> >modify it from "you cannot..." to "be careful and run life tests..."
> >
> >Brian
> >
> >Gary Camac wrote:
> >>
> >> Brian,
> >>
> >> Why do you feel you can't run LCDs through the wash? We have ran LCD
> displays through the
> >> wave and a soaponified wash for over 15 years here. I don't know of any
> field reliability
> >> issues on these units.
> >>
> >> I agree with Kelly's last comment on the inhale due to cooling the part
> too rapidly. This is
> >> the reason I like to see a slight temperature increase in each wet
> section of my washer.
> >>
> >> Gary Camac
> >>
> >> Phil Nutting wrote:
> >>
> >> > Hi all,
> >> >
> >> > I don't remember if I posted this question in the past months, but I'll
> >> > repost to get a fresh answer.
> >> >
> >> > Are there any components (pth) that can't be washed in an aqueous
> system?
> >> > Over the years we've had problems with electrolytics, polystyrene
> bodied
> >> > caps and small board mount relays.
> >> >
> >> > Does anyone have experience with thermal compound or other thermal
> >> > management materials in aqueous clean?
> >> >
> >> > Oh ya, the system I just installed is a closed loop DI water wash with
> no
> >> > chemicals.
> >> >
> >> > Phil Nutting
> >> > Manufacturing Engineer
> >> > Kaiser Systems, Inc.
> >> > High Voltage Power Supplies That Work(tm)
> >> > 126 Sohier Road
> >> > Beverly, MA 01915
> >> > ph: 978-922-9300
> >> > fx: 978-922-8374
> >> > [log in to unmask]
> >> >
> >>
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