If you are looking for a good strategy or method to repair your Nintendo 3DS you should try www nintendorepairshop com they have some good videos and guides to repair these consoles.
Nintendo Repair Shop
www nintendorepairshop com.
the water may drop into the console, and make the circuit shortage. So don't power it on before dry it. You should dry it with a windyblow. then open the shell to repair it.
If you are not profesional, I suggest you to go some store to ask help. it is easy to damage the board inside.
You should contact Nintendo Support.
get a differant battery for it (it probabaly got wet somehow) or just get a new ds.
Charge your DS and it should be fixed. Get a new battery because it might hav gotten wet, but if caused by dropping it then it isn't fixable.
fix it do do
Fix a wet area on yard
go to gamestop and they will fix it
wait a day without touching it does not matter in light or not that is how i fixed my ds yesterday
you probably would have to send your Nintendo ds lite to Nintendo company t fix it.
this is the EXACT same problem my friend had.. The answer.. it's just broken.. :( but you can send it in to Nintendo they'll fix it
At your supermarket
no were
i would try blowing on and around the broken ds button. if that does not work i would call Nintendo ds customer service and see if they can help fix it.