Well you do have some corrosion on the SMC chip so that does need to be cleaned off using some White Vinegar on a cotton swab to clean the copper oxide (the green stuff) don't over do the vinegar! And after you clean it off you'll need to use some distilled water to wash down the area to clean off the vinegar.And no we don't want tap or spring water as its loaded with minerals!
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You'll still need to take the logic board out to work on it.
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~~You'll still need to take the logic board out to work on it.~~
Its likely the small SMD devices and the chip its self have corrosion under them so you really need to carefully desolder them off (I would use a hot air rework station) you can also use a good soldering iron, but its a bit harder as we need to add solder to the SMD pins so all of them are wet and so you can heat the whole chip at once! When the solder is wet all the way around the chip should just slide off don't push! As you'll damage the logic board pads.
Now with a better idea on what you'll need to fix this make sure you'r up to the task. The SMD IC and SMC devices are available you might want to just replace them.
Given the age of your system it likely needs a new battery as well.
Well you do have some corrosion on the SMC chip so that does need to be cleaned off using some White Vinegar on a cotton swab to clean the copper oxide (the green stuff) don't over do the vinegar! And after you clean it off you'll need to use some distilled water to wash down the area to clean off the vinegar.And no we don't want tap or spring water as its loaded with minerals!
You'll still need to take the logic board out to work on it.
Its likely the small SMD devices and the chip its self have corrosion under them so you really need to carefully desolder them off (I would use a hot air rework station) you can also use a good soldering iron, but its a bit harder as we need to add solder to the SMD pins so all of them are wet and so you can heat the whole chip at once! When the solder is wet all the way around the chip should just slide off don't push! As you'll damage the logic board pads.
Now with a better idea on what you'll need to fix this make sure you'r up to the task. The SMD IC and SMC devices are available you might want to just replace them.
Given the age of your system it likely needs a new battery as well.