Dell e5420 power on then off

[usyusy]

Dell e5420
(KRUG 14" UMA Rev. A02 10ELT16G001-A, of FOXCONN) no exact schematic could be found

Power on, then off after a few seconds (even without ram and processor same situation)
Takes till 1.40A on dc supply

Core ok
Pltrst ok
DRAMRST ok


Any guidance please

[mcplslg123]

Re: Dell e5420 power on then off

Look for corrosion under microscope. Bios flashed??

[usyusy]

Re: Dell e5420 power on then off

Look for corrosion under microscope. Bios flashed??

ok sir, bios has not flashed as i don't have it, will do a request in the bios section.

[usyusy]

Re: Dell e5420 power on then off

Sir a bios was flashed, but takes dc supply only 0.14A,
No core now
Even again reflashed from backup bios, but still same. What could be its science.
Some dust was cleaned also, no noticeable corrusion was found.

[mcplslg123]

Re: Dell e5420 power on then off

1.8V rail is present??

[usyusy]

Re: Dell e5420 power on then off

1.8V rail is present??

Yes sir a small coil showing one side about 2.97v and other side 1.79v, when powered on