Hi every body, I've a problem with a card with Aduc 812bs micrcontrolor, pins (20-21;47-48) have (27ohm only) the rectifier (Lm7805) is boiling, I know that ADuc 812 is protected from short circuit ,normally how is the magnitude of the resistance between pins 20-21 or 47-48? Is The microcontrolor out of service?
N.b all other components are verified: capacitors ,resistors, diodes...