A83S motherboard number K43SV REV 3.0 a common fault :

3V and 5V voltage is normal , but can not  boot up . checked  and found 
Resister Packs 822 damaged , this is a 10K Resister Packs , removed and used two 10K resister to replace . Your loyal friend - Pinkney , http://www.htic-tool.com 

from https://plus.google.com/b/107329939332162905445/+Htictoolchipset/posts