DjGreggieP
DjGreggieP HalfDork
12/20/20 12:55 p.m.

I need assistance with an OEM ECM, I have a bunch of spares from my collection of LH's and I have one that I may have killed.

I understand the fundamentals of how it works, but my question is...

 

HOW do I get rid of this hard jelly stuff so I can access the board? I started digging with a knife but I don't want to risk physically damaging the board. These are available as refurbished so there must be a way to get it out of there.

I figured the Hive may be able to direct me to something that will work safe enough.

Thank you in advance.

AngryCorvair (Forum Supporter)
AngryCorvair (Forum Supporter) GRM+ Memberand MegaDork
12/20/20 1:20 p.m.

Glad nothing's wrong with Mojo ;-)

Stealthtercel
Stealthtercel Dork
12/20/20 9:31 p.m.

I guess my first question would be, Do you know what this Substance of Doom is and where it came from?  If you do, then I think what you want is somebody who understands chemistry to tell you how to dissolve it or liquefy it or attack it with a magic goop that separates it from the board.  Or maybe freezing the whole thing would make it more tractable?  (I *assume* an ECM is certified to survive down to minus 40 or so....)

alfadriver (Forum Supporter)
alfadriver (Forum Supporter) MegaDork
12/21/20 6:07 a.m.

In reply to Stealthtercel :

It's likely conformal coating that everyone used to protect boards many years ago.  It was put on thick for automotive computers.

APEowner
APEowner GRM+ Memberand Dork
12/21/20 7:25 a.m.

Here's a good article on coating removal https://www.vaniman.com/ultimate-conformal-coating-removal-guide/

DjGreggieP
DjGreggieP HalfDork
12/21/20 9:22 a.m.

On the LH platform this lived behind the drivers side headlight, so its seen cold and wet. 

I'll check the article, and hopefully I can figure something out. I have like 5 or six of these things, just the one that's broken and wouldn't mind seeing how hard it would be to fix and 'tweak' if possible. 

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