mb draw power from ac adapter
hi, im newbee to all of this, but learning. i have problem to locate failed component on motherboard. laptop suddenly stop working, no signs of life at all. try measuring power rails, but as soon i connected before measured multiple power adapters (all of them gave me 19V and working on another laptops), and start measuring first spot on mb (black on ground and red on red wire on mb power connector) it showing power fluctuacting from 0.40V to 0.60V instead 19V. from one ac adapter heard clicking sound, from another ac adapter standby led start blinking. any help would be greatly appreciated. thanks.
Update (11/18/25)
Update (11/18/25)
crwdns2934109:0crwdne2934109:0
crwdns2889612:0crwdne2889612:0
0
@nule4 make sure your multimeter is on DC :-) If so, this could be a bad DC-diet. Post a picture showing where you measured the voltage. It’s not the small voltage fluctuation but the fact the it does not show the 19V which is concerning. What exact model is your motherboard and what was the original issue with it?
crwdns2934271:0crwdnd2934271:0 oldturkey03 crwdne2934271:0
sorry, i forget. fujitsu t730, main board cp470095-z2. resistence on the main rail is between 40-60 ohms.[image|3857560]
crwdns2934271:0crwdnd2934271:0 petar petrovic crwdne2934271:0
@nule4
With the charger connected to the DC-In jack, what do you measure on the red and black wires of the DC-In jack cable plug when it is unplugged from the motherboard?
crwdns2934271:0crwdnd2934271:0 jayeff crwdne2934271:0