On Sun, Jul 8, 2012 at 6:30 AM, David Beierl <dbeierl@attglobal.net> wrote:

> At 09:03 PM 7/6/2012, neil n wrote:
>>
>> On LH end of the PCB, there appears to be some kind of corrosion.
>> Almost looks like rust. That edge of the PCB is a different colour
>> than other edges:
>
>
> Certainly looks as though some water got in there - what does the inside of
> the case look like?
>
>> Clean up with Isopropyl?
>
>
> I guess.

Thanks.

I recently got my new glasses.    ;^)

Didn't notice anything untoward on inside of case. Tried a little
Isopropyl. Did nothing.

Seems what I saw as corrosion may be the surface coating lifting away
(or ? process) allowing the copper trace to be seen. If that makes
sense.

>
>> And, I *think* this is simply rosin left over from factory soldering
>> job, but could they be signs of heat damage?
>
>
> Not from factory but from rework of some kind - replacement of driver or
> reflow of bad joint.

Interesting. There were quite a few of these spots.

>
>> ... There are white globs
>> covering what may be fasteners and white ribbon connectors between
>> them.
>
>
> Those are soldered connections -- apparently VW noticed that they are among
> the most prone to fatigue failure of the solder and hoped to help - I'm
> guessing that's an 022D ECU with some surface-mount components on the back
> of the big board and a substantial shield can over the small one.

I thought it might be a D suffix ECU but don't see that in the PN on ECU case.

I don't recall seeing components on backside of either board or a heat shield.

Thanks much,

Neil.

--
Neil n

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