I know what I would use on it.
won't say the name, but it is a universal anti-corrosion product that
has never done me wrong, in some near 50 yrs of usin' it.

On 7/8/2012 11:32 AM, neil n wrote:
> 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
>
> 65 kb image Myford Ready For Assembly  http://tinyurl.com/64sx4rp
>
> '88 Slate Blue Westy to be named.
>
> '81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/
>
> Vanagon VAG Gas I4/VR Swap Google Group:
>
> http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
>