Author Topic: Battery acid corroded circuit board  (Read 987 times)

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Offline lyk93

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  • Posts: 1
  • Country: sg
Battery acid corroded circuit board
« on: May 15, 2016, 01:56:06 pm »
Hi all,

I have a logitech n305 keypad that is corroded by battery acid (alkaline i think).

I have dissolved the acid crystals with vinegar and baking soda mixture and wiped the board with alcohol.

However, when I insert batteries the keypad doesn't power on.

I tested for continuity as suggested by other forums and there is continuity in the circuits.

Please advise on what else can I do. Someone recommended me to bake the board under heat to try to revive the board but I'm not sure what is right as I have little experience with electronics repair

thank you


 

Offline mikerj

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  • Posts: 2553
  • Country: gb
Re: Battery acid corroded circuit board
« Reply #1 on: May 15, 2016, 07:35:30 pm »
Depending on how long the PCB was exposed to the leaking battery, you may have open circuit vias or tracks.  The picture is too small to see clearly, but it looks like some of the tracks are discoloured, if so you should check the track for continuity with a multimeter.
 

Offline Ian.M

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  • Posts: 9152
Re: Battery acid corroded circuit board
« Reply #2 on: May 15, 2016, 07:47:57 pm »
First you need to remove ionic contaminants.   Soaking and scrubbing with hot water with a trace of dish detergent is about as good as you can get if you don't have an ultrasonic cleaning tank.  Rinse twice with deionised water, then with IPA and air dry for a week or 24H with moderate heat and forced ventilation.

Positive tracks usually get corroded away by electrochemical action.   Start from the battery positive and follow it looking for breaks, pins or metalisation corroded off components etc.
 


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