UPDATE I'm finding some errors in the circuit tracing, I'm working on the new schema, meanwhile I'm posting a new image of the back of the PCB without the pen marking.



Full size --> http://img845.imageshack.us/img845/3162/31052011123.jpg

I found I included a wrong datasheet in the above archive on megaupload, the right one for transistor S8050 is:

http://pdf1.alldatasheet.com/datashe...RON/S8050.html

As soon as I have some satisfactory result I'll post a new archive