dell latitude e5400 power problem

[The ENIGMA]

hello everyone
I have a power problem with dell latitude e5400
leds flash less than a second
when I press power button nothing happened when I disassemble it
one of ram sticks was not properly set
I measured some diods,, fuse,,, big resistant parts,, some mosfets
19.25 volt was measured on the input jack no PWM ices getting heat up
north and south bridges seem fine
I tested board with/without ram and cpu no power
where do I began test
please guys help still newby in this job

[polytek]

Re: dell latitude e5400 power problem
[*]check the power adaptor try another good
[*]check the power button
[*]with the schematic diagram check the 3 and 5volt page 45 on the sch pl44 and pl50 voltage must be 3.3V and 5volt if there is no voltage check without adaptor for short
here i upload the schematic
good luck

[The ENIGMA]

Re: dell latitude e5400 power problem

teslam

I was looking for this schematic all day
something suspicious ,, adapter it reads
18.7 ~ 19.41 not stable read gonna chek my multimeter and try another adapter before it gets deep
thanks I will do some check and replay
thanks and peace for all Tunisians

[The ENIGMA]

Re: dell latitude e5400 power problem

there was some changes in numbers
my board is a business class
i have found the PWM chip pu79 SN0608098
all check points were good
1.3, 2.0, 3.3, 5.0, volts
there was broken resistant PR650 connected to pin 19 "PR659 on the schematics"
with value 10.3 K and it has something to do 5.0v VCC or 5V_ALW_2
schematics did not mention exactly PR650 but it is in the same position of PR659
also the track is lost hopefuly i was able to discover the lost track wider than the resistant size
10R3 means 10.3 K right?
whant could be done
apreciate your help and your time

[polytek]

Re: dell latitude e5400 power problem

good news,
i think the resistor PR650 is ok 10R3=10.3 OHM
check PU80.5=3.3VOLT PU80.7=5VOLT
try with this schematic diagram

[The ENIGMA]

Re: dell latitude e5400 power problem

yes pin no 5 3.3v and pin 7 5.0v
what next,,

[foramlaptop]

Re: dell latitude e5400 power problem

hi gays i am rt-809f programmer use (st 45pe16vg) 8pin 16 Mbit, low-voltage, Page-Erasable Serial Flash memory e5400 mostly this ic bad

[onlinejaved]

Re: dell latitude e5400 power problem

hi guys
i have a problem with dell latitude E5400.
when i plug in a/c adapter in my laptop, the adapter led goes to turn off.
i have done with power drain and bios reset but same problem.
i disassemble it and check with multimeter and found some capacitor's like pc41, pc497, pc493 comes with shorting beep.
please help me with component should be replace.
and sorry for weak english.
motherboard model foose intel 14 mb 07236-2.
thnx for your appreciation

[Magnusa2]

Re: dell latitude e5400 power problem

pls help
bios

[Magnusa2]

Re: dell latitude e5400 power problem

on off problem
plz help

[ravi_1617]

Re: dell latitude e5400 power problem

good news,
i think the resistor PR650 is ok 10R3=10.3 OHM
check PU80.5=3.3VOLT PU80.7=5VOLT
try with this schematic diagram

Thankyou ,its matching
for others to help if Serching
Foose Intel 14MB
07236-2(brcm 5761)
other side writen
pwa p/n:RM833.C951C
PWB P/N:C945C