Liquid spill, works, AHT perfect but dim light on magsafe, not char

I have a Macbook Air Late 2010 with liquid damage. I had to change the keyboard backlight fuse. I have thoroughly cleaned with a brush and cleaning of electronic components. The board boots correctly. According AHT is entirely correct. But I have the magsafe dim light. Also, if it's off with magsafe connected flashes green / orange. All this with very dim light on the magsafe.

The battery has 2 of the 4 points marked in red, but not swollen. I do not detect battery voltage using the multimeter and the battery is not detected, it always appears that the battery is not installed (ISTAT, coconut, osx ... no battery detected).

Moreover, I found that the center pin magsafe gives 0V when connected, while others give 16,5V. The fuse next to the magsafe connector gives the same values on both sides, checked against ground. And there the fuse near the battery connector too.

Cleaning with isopropyl alcohol would do something? The little corrosion or coffee stain I saw was around components fuse blacklight. I cleaned it well and now I do not see anything below the micro chips and I do not know ...

But such schemes have no inscriptions on the plate and in the early polycarbonate MacBook, I can not follow the scheme ...

You could tell me where the others are and G3Hot recomendáis check. If solucionase asking for power / audio board the asking, but I feel that it is not so and I would check.

I reset the PRAM / NVRAM and as I have no keyboard yet (it's on the way ...), I have reset SMC disconnecting long the battery and pressing the keys and pins from power-on board, it seems that resets it. But do not know how to check 100%. Until you have keyboard I can see that somehow SMC reset?

Thank you very much for the help that you can give me and excuse my English.