SAMSUNG NP300E-DEAD
Posted: Wed Nov 09, 2016 8:33 pm
SAMSUNG NP300E-DEAD
THE UNIT WAS DEAD. CHECKED THE VOLTIN SECTION OUTPUT IS OK..BUT NO 3V5V ALW WERE NOT PRESENT. FIRST CHECKED THE VCC LINE OF THE STEPDOWN IC "TPS51125".
FOUND THE IMPEDANCXE OF VCC LINE OF TPS51125 WAS VERY LOW. THE LIEN WAS CONNECTED BY ONE RESISTER AND CAPACITOR. THE INPUT END OF RESISTER WAS HAVING 19V. BUT OTHER END OF RESISTER WAS HAVING LOW IMPEDANCE. REMOVED THE STEPDOWN IC. NOW IMPEDANCE OF VCC LINE WAS OK. PLACED A NEW TPS51125. THE MB WAS POWERED ON WITH DISPLAY. HAPPY
THE UNIT WAS DEAD. CHECKED THE VOLTIN SECTION OUTPUT IS OK..BUT NO 3V5V ALW WERE NOT PRESENT. FIRST CHECKED THE VCC LINE OF THE STEPDOWN IC "TPS51125".
FOUND THE IMPEDANCXE OF VCC LINE OF TPS51125 WAS VERY LOW. THE LIEN WAS CONNECTED BY ONE RESISTER AND CAPACITOR. THE INPUT END OF RESISTER WAS HAVING 19V. BUT OTHER END OF RESISTER WAS HAVING LOW IMPEDANCE. REMOVED THE STEPDOWN IC. NOW IMPEDANCE OF VCC LINE WAS OK. PLACED A NEW TPS51125. THE MB WAS POWERED ON WITH DISPLAY. HAPPY
