"Possible SMC damage from liquid spill - needs a logic board?"에 답변I repairing these systems. If the SMC was bad you would not even get a green light on the magsafe. You'll need a schematic diagram and the boardview (.brd) file to find the part location. You may need to clean the board and possibly have a shorted backlight fuse (Backlight issue). If the battery doesn't charge (green light) the issue is possibly the Intersil ISL6259A (CSI/CSO) or the diode connecting the adapter to the Intersil.
"Broken on off switch"에 답변Here: http://www.ebay.ie/itm/252034935133?ssPa...
"Can I replace my keyboard with a backlit one?"에 답변I'm a tech and yes it can. You'll need to replace the modular electronic assembly that connects the trackpad and keyboard as well as the non existent backlight film with the parts from the later model. I'll cost about $100