Dell 1521

[eyemfedup2]

hi all
new project

i have a dell 1521
it will post fine off a charged battery but not the power cord
i have swapped out the power cords with three new oem dell chargers
no go wont even charge a battery
suspected the dc jack
looks fine
i don't know the actual pin out voltages but I'm getting 19.5 volts to the jack
and voltage to allot of the motherboard
i removed the dc jack and cleaned it
looks OK
like i said i dont know the pin out voltages but once again 19.5v if I'm doing it right
soldered it back in really well same thing
if i put a low battery in it the orange light blinks forever
no charge to battery
on the of chance it is the dc jack i ordered one
waiting for it to come in
while i wait does anyone have any ideas
i made sure that the jack was flowed well
Ive never had a 1521 so i dont know the inherent problems
have had the 1525's and are much easier to trouble shoot
as always thanks for listening and i do appreciate all input
thank you guys and hope to hear back soon

 

[eyemfedup2]

ok
i replaced the dc jack once again
did a perfect job
clean and clear
no solder over run or short
but guess what
the jack started smoking
two little surface mount components f1 and f2 are now open???
does anyone know what they are
they dont look like diodes as they have a white band on both ends

also is it humanly possible to get a schematic for a mother board
still powers up on a battery but not a power cord
i have years of experience in electronics can trouble shoot and solder well
if i could find out what f1 and f2 actually are it would really be helpful
or a schematic would be the bomb
i can also do surface mount repair quite well
i just need to know what the components are
love a challenge
HELP if you can
once again thanks
ps still getting power to mobo but not to f1 and f2