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There are two things to note when repairing electronic components. I repair a lot of SMD PCB's for the Murchison Wide-Field Array and it has some of the most inhospitable environments (acid soil). It is though sometime not worth repairing some due to time and money and one of the factors that make it hard to repair is Electrolysis damage, as this damages the solder as well as the board. But I find for the most part most water damage can be easily repaired even though it may not look good is entirely functional.
The only time I reject automatically is if the damage is burn't as the carbon will change the electrical properties and also the performance. Anyway as I do a lot I am not flustered to give a lot of things try and for the community it is a pleasure as long as it doesn't take to long to do.
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