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A smart device board shown various issues and stopped to power on. I have opened it to determine the cause of the problem and I have seen it has multiple corrosion signs.

enter image description here

The board wasn't exposed to water or humidity by myself, and it is an item produced around a year ago, I'm surprised to see it in such conditions, probably these damages have been caused by some problem in the production or distribution chain.

In what way I could recover it from corrosion damages?

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    \$\begingroup\$ Is that corrosion or just dust and debris? Hard to tell. Most of the metal parts don't look corroded. Fiberglass PCB material doesn't really corrode. I would try cleaning it with canned air first and see how it looks. \$\endgroup\$ – mkeith Nov 14 '19 at 6:14
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    \$\begingroup\$ With NO POWER APPLIED you can clean with pure water (distilled or deionised or tap water if drinkable) and a good stiff brush. IPA is useful but water is an amazingly effective polar solvent. Then dry very very very thouroughly before applying power. \$\endgroup\$ – Russell McMahon Nov 14 '19 at 14:30
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Circuit boards can often be cleaned with Isopropyl Alcohol (also referred to as Isopropanol or IPA, easily purchasable from most online vendors or a local pharmacy in the first aid section). I use a tooth brush for gently scrubbing corrosion off of PCB surfaces and allowing the board to dry completely before trying to power it on again. That said, the damage looks fairly severe and it's unclear whether cleaning alone will recover the board's normal functions.

Example: https://www.amazon.com/Swan-M314-Isopropyl-Alcohol-99/dp/B00NMPLSZ6/ref=sr_1_12?keywords=Isopropanol&qid=1573709322&sr=8-12

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  • \$\begingroup\$ I use this technique to recover digital intercom circuit boards that apartment managers damage accidentally. They are pressure washing the lobby area and manage to get a good squirt of detergent water into the intercom panel. The IPA method works well. \$\endgroup\$ – John Canon Nov 14 '19 at 6:45
  • \$\begingroup\$ thanks for the answer. Is It possible to use ethanol instead? \$\endgroup\$ – AndreaF Nov 14 '19 at 11:06
  • \$\begingroup\$ Save the ethanol for internal use, although high-impedance circuits might benefit from an alcohol bath. Check your board for a back-up battery or super-capacitor that might have residual voltage before washing. Liquid can trap underneath components - a forced air blowdry might be a good idea if you're impatient. \$\endgroup\$ – glen_geek Nov 14 '19 at 15:11

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