measuring again the components around the IC i found that R104 was blown...
it wasn't obvious until i
looked at it from the sides and i've noticed the coating from the bottom side of the resistor was missing,
from the schematic i can see it goes to the pin that says ISENSE i guess it senses current...but since i
don't know much about switching power supplies i don't know if that resistor is the cause that the
previous IC got blown and now the new one is not functioning.
it's value must be 0.47ohm (yellow, blue or purple? and silver) and now it measures 7Mohm and it is 0.5W
which i don't have because it is rare number...with what else i could substitute that resistor?
do you think i should power up the supply after i change the resistor or it might blow the IC again?
thank you guys.