lenovo g50-80 nm-A361 Led Power on and shut down after 2 secend

[sahamipoor]

hello frinds..
NM-a361 rev 1.0 whith Cpu i7 and AMD graphic. and after pushing power button,led power on and all voltages ok But after 2 secend going to Off!!

i tried meany BIOSes and Ec file but not working!!!
PLT_S3*S4 * SUSP * EC_WORK* AND EC_RST AND ....IS OK,AFTER PRESS POWER ,But going to off after 2 second!
3/3 -5v
1.0v PCH
0.9v VGA
1.33 RAM
0.66v RAM
and Cpu corte 1.73 is ok for 2 secend!!
I get confused for this!! before than for years ago i solved this problem But forget it... can gude me please?

LINK to schematic https://www.badcaps.net/forum/troubl...10#post1169510

[sahamipoor]

also I changed Mosfets of Vcor cpu 1.73 ,but still not working!

PLTRST
SYSON
PCH_PWROK
PCH_PWR_EN
SUSP#
SUS_VCCP also have voltage for 2 secend only!!
BUT: CPU_DRAMRST# is low in any mode!! and when press power 0.09 .and going to 0v... (with or without RAM slot)

[mcplslg123]

Very likely SOC fault

[sahamipoor]

Very likely SOC fault

yeah..but 32khz in fix and ok..24mhz by pressing buton is ok too...How can you be sure?
S3- S4 SUSP --- SUSWARN# SUSACK# BY PRESS IS OK!!!

[sahamipoor]

problem Solved!!!!

ّFOR any one need it.
two resistors Burning of and need to changed RC19 AND RC20 =H_PROCHOT#
... and taking heat and resoldering soc (CPU I7 ) and carefully...
cheers

[mcplslg123]

I knew that its SOC dry joint issue and thats why said SOC fault. If you have lifted the SOC without damaging the PCB pads(classic lenovo glue) and reballed it,its going to last for a year or so. But if you just heated the SOC,its going to fail within a week.

[sahamipoor]

I knew that its SOC dry joint issue and thats why said SOC fault. If you have lifted the SOC without damaging the PCB pads(classic lenovo glue) and reballed it,its going to last for a year or so. But if you just heated the SOC,its going to fail within a week.

heating... it was just to ensure the condition of the current.

Basically, the fault Was from two low-ohm resistors Damaged

[sahamipoor]

I knew that its SOC dry joint issue and thats why said SOC fault. If you have lifted the SOC without damaging the PCB pads(classic lenovo glue) and reballed it,its going to last for a year or so. But if you just heated the SOC,its going to fail within a week.

tanks you..for your companionship...