Dell E6430 power led always on, cannot turn off, nothing on screen

[Andreasbest]

Hello!
First i thought that this fault is the usual GPU that needs reballing.
Then i noticed that when i plug the power adaptor to laptop the power LED get on immediately and never turns off even if i press the button for 10 seconds. Only way to turn it off is by unplugging laptop from power adaptor, so i thought that perhaps is a capacitor fault?
Also nothing appears on internal or external screen.

Photos and schematics attached.
Thank you in advance!!

[Techtiger]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

what voltages are missing on the coils and check all coils Diode mode & update ?

[Andreasbest]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

Sorry but i don't understand.
Where exactly you want me to measure?

[SMDFlea]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

All the large square grey coils,test voltage.Then with no power check resistance to ground.

[Andreasbest]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

Oh ok
PL1000 1v short to gnd
PL1001 1v short to gnd
PL1300 19.56
PL1301 3.3
PL5 19.56v
PL6 0v short to gnd
PL701 0v short to gnd
PL702 0v short to gnd
PL703 0v short to gnd
PL704 0v short to gnd
PL705 0v short to gnd
PL200 1.5v
PL102 5v
PL101 3.3v
PL400 1v
PL500 0v short to gnd
PL600 0v short to gnd

[mcplslg123]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

Those coils may not be shorted to ground. Measure resistance on them in "Resistance" Mode. Low resistance is ok on cpu/gpu coils specially if cpu is soldered onboard.

[Andreasbest]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

You are right
PL1000 1v 6Ω
PL1001 1v 6Ω
PL1300 19.56
PL1301 3.3
PL5 19.56v
PL6 0v 0.6Ω
PL701 0v 3.6Ω
PL702 0v 3.7Ω
PL703 0v 3.8Ω
PL704 0v 2.4Ω
PL705 0v 2.4Ω
PL200 1.5v
PL102 5v
PL101 3.3v
PL400 1v
PL500 0v 16.9Ω
PL600 0v 15.8Ω

Do you want to measure the coils that have voltage too?

[mcplslg123]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

PL6 is ground man-no voltage is expected there.

[Andreasbest]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

I measured every coil just in case.

[Andreasbest]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

Any ideas?
Perhaps a corrupted BIOS or not?

[SuperAman]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

Any ideas?
Perhaps a corrupted BIOS or not?

Most likely a corrupted BIOS or Super IO controller.

[Andreasbest]

Re: Dell E6430 power led always on, cannot turn off, nothing on screen

Fixed
It was indeed a corrupt bios issue.
Thank you all!