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when charger is first connected, the fan comes on then off after 10 sec. the led charge light is on . measure 5 volts at battery connector when charging . i need troubleshooting guide to repair

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[Was it a lot of water and where exactly on the laptop it spilled? I spilled soy sauce near the trackpad and it got on the battery (genius guy at Apple Store said it got on the logic board) but I didn’t see any. I would try to checking the logic board carefully if corrosion is occurring (which could be brushed with a soft paint brush and 90% or above isopropyl alcohol) and if your laptop was soaked you might have to replace the battery. Here is the guide for teardown for your MacBookMacBook Pro 13" Unibody Mid 2009 Teardown