Technical Support la-675ap rev1.0 all supply ok CPU VRM Core Missing

[electroraipur]

Sir, la-675ap rev 1.0
all supply ok...but vrm core missing..i do everyting
repleced all mosfet and vrm core ic
same... i do bios also plz suggest....
1.5v dc to dc ok
3.3v dc to dc ok
5.0 v dc to dc ok
amp stuck on 0.180

 

[Hosein Asadolahi]

which mosfet you change it ? what is part number of that .

 

[electroraipur]

witch mosfet you change it ? what is part number of that .

this mosfet on scrap same board

 

[Hosein Asadolahi]

this mosfet on scrap same board

Are you sure the MOSFETs you replaced were burnt? In other words, why did you decide to replace these MOSFETs?
you change all mosfets of all cpu voltage pwm circuits . In the event that ,, the problem was probably not 90% of this.
you change mosfet of cpu_core voltage and vgfx_core voltage not vrm core .
you must check all other voltage such as a 1.05 , 1.8 , ... . if all of this voltage is ok vr_on signal will be generated and after that voltages of cpu will be generated .

 

[electroraipur]

lenovo g570 la-675ap DDR3_dramrst# missing

all coil supply ok
dramrst voltages missing its 0.57v showing
when i remove Q2 its 1.5v and i check pull down ressistor R39 also its 5k.... pls suggest what i can check

 

[Hosein Asadolahi]

lenovo g570 la-675ap DDR3_dramrst# missing

all coil supply ok
dramrst voltages missing its 0.57v showing
when i remove Q2 its 1.5v and i check pull down ressistor R39 also its 5k.... pls suggest what i can check

hi
pls dont spam bro.
Any signal whose name ends with "#" means that signal is low active , if this signal is low, it is correct, and if it is high, it means it is not active .
so ddr3_dramrst# must be low that is true .

 

[electroraipur]

hi
pls dont spam bro.
Any signal whose name ends with "#" means that signal is low active , if this signal is low, it is correct, and if it is high, it means it is not active .
so ddr3_dramrst# must be low that is true .

thanks sir, case was done .there was problem in u3 mosfet ths mosfet was short with source to get... we remove and replece this mosfet case was done...

thanks for support.... we done this case after watching your videos

 

[Hosein Asadolahi]

thanks sir, case was done .there was problem in u3 mosfet ths mosfet was short with source to get... we remove and replece this mosfet case was done...

thanks for support.... we done this case after watching your videos

I am happy about this. Good luck