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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