White deposit on PCB?

paula at synth.net paula at synth.net
Sun Sep 8 10:04:48 CEST 2019

Looks like flux that hasn't been properly cleaned off.
Unlikely to cause the issues, and IPA should get rid of it. 

Look for black rings/lines around solder joints, this is a bad joint, a
quick reheating of the joint should resolve it.
Usually places to check are capacitors in the PSU. 


On 2019-09-07 20:44, Joost Schuttelaar wrote:

> Hey -bar, 
> I got an old 24" Cinema Display which works fine, but only powers up properly 1 out of 10 times. I suspected the power supply is bad and pulled it out to inspect the caps.
> The caps look fine, but the board seems to be covered with some white deposit, corrosion? Picture attached. Does anyone know what this is and could it be causing these issues?
> I'll get some Isopropyl on Monday to clean it up regardless...
> -- 
> Joost Schuttelaar
> The Hague, NL 
> _______________________________________________
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> music-bar at lists.music-bar.org
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> Listen to Music-Bar Radio! <http://www.music-bar.org/radio.html>
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