DAG3DCMBCC0 REV C cpu shorted?

[mauareju]

hi everyone
as the title says i got this board with a possible short in cpu

when i connect the power supply the laptop draws 0.015 amps and when press the power button the light in the same button turns on and quickly turn off at the same time that power input ligth do the same
its a hp omen dc1003la with a i7 9750h and a 1660 ti

when push the button the laptop max amp draw is 0.120 amps and turn off

measurement near the cpu show me a full short ill attach the image

how can confirm that cpu is shorted

i tried injecting 1volt and 1 amp limited but nothing get hot even cpu still cold , should inject more current?

the only low measurement is near the cpu other parts on the board sems to be fine


thanks in advance

[myth77]

Re: DAG3DCMBCC0 REV C cpu shorted?

What is exact ohm reading on that cpu coils relative to ground?

[mauareju]

Re: DAG3DCMBCC0 REV C cpu shorted?

What is exact ohm reading on that cpu coils relative to ground?

hi

relative to ground is 0.2 ohm

[myth77]

Re: DAG3DCMBCC0 REV C cpu shorted?

I would remove those vcore coils and check on which side resistence is 0.2 ohm

[mauareju]

Re: DAG3DCMBCC0 REV C cpu shorted?

I would remove those vcore coils and check on which side resistence is 0.2 ohm

is on cpu side?

all hopes are lost?

[mcplslg123]

Re: DAG3DCMBCC0 REV C cpu shorted?

0.2 Ohms is too low even for a 9th gen cpu though i'm not 100% sure.

[mauareju]

Re: DAG3DCMBCC0 REV C cpu shorted?

0.2 Ohms is too low even for a 9th gen cpu though i'm not 100% sure.

yes i measured an i5-8300h wich was functional and in the same line in that laptop has an 2.9 ohm value


the strange thing here is that i inject 1v and 1.6a to this i7-9750h and doesnt get hot, any component, should inject more cutrrent or volt?

[mcplslg123]

Re: DAG3DCMBCC0 REV C cpu shorted?

More current, not volt. You can pump upto 5Amp. If SOC is shorted it will consume almost 1A or higher current and u cant feel the heat so easily. U leave with current injected for 10 mins and then it may be slightly warm.

[mnciks11]

Re: DAG3DCMBCC0 REV C cpu shorted?

hi

relative to ground is 0.2 ohm

This is not shorted, i've seen even0.1 ohm and the machine was working 100%

[mnciks11]

Re: DAG3DCMBCC0 REV C cpu shorted?

More current, not volt. You can pump upto 5Amp. If SOC is shorted it will consume almost 1A or higher current and u cant feel the heat so easily. U leave with current injected for 10 mins and then it may be slightly warm.

Totally agree with you, if the PCH is intergrated within the CPU, then we can conclud that the cpu is shorted but believe me guys ive seen 0.1 ohm and the machine was working 100%

[mnciks11]

Re: DAG3DCMBCC0 REV C cpu shorted?

hi everyone
as the title says i got this board with a possible short in cpu

when i connect the power supply the laptop draws 0.015 amps and when press the power button the light in the same button turns on and quickly turn off at the same time that power input ligth do the same
its a hp omen dc1003la with a i7 9750h and a 1660 ti

when push the button the laptop max amp draw is 0.120 amps and turn off

measurement near the cpu show me a full short ill attach the image

how can confirm that cpu is shorted

i tried injecting 1volt and 1 amp limited but nothing get hot even cpu still cold , should inject more current?

the only low measurement is near the cpu other parts on the board sems to be fine


thanks in advance

I think that board is missing 1.05v please check

[myth77]

Re: DAG3DCMBCC0 REV C cpu shorted?

This is not shorted, i've seen even0.1 ohm and the machine was working 100%

What was the cpu?
And did you meassure ohm right after you unplug the power or after when it was cooled and power drained?

[mnciks11]

Re: DAG3DCMBCC0 REV C cpu shorted?

What was the cpu?
And did you meassure ohm right after you unplug the power or after when it was cooled and power drained?

Obvious you can't measure for ohms while plugged in, it was unplugged...

I can't really remember but I know for sure that it was the latest

[myth77]

Re: DAG3DCMBCC0 REV C cpu shorted?

Obvious you can't measure for ohms while plugged in, it was unplugged...

I can't really remember but I know for sure that it was the latest

I didn't mean you measure it while power on..There is difference in ohm resistance if you measure it few seconds after the power cord unplugged and let's say half hour after power cord unplugged...

[mauareju]

Re: DAG3DCMBCC0 REV C cpu shorted?

I think that board is missing 1.05v please check

yes 1.05v is mising
is this voltage always?

where i can find the source of this voltage? there is no scheme of this board

There is more photos of the board

[mauareju]

Re: DAG3DCMBCC0 REV C cpu shorted?

Totally agree with you, if the PCH is intergrated within the CPU, then we can conclud that the cpu is shorted but believe me guys ive seen 0.1 ohm and the machine was working 100%

yes the pch is on another chip is not in the cpu

[mauareju]

Re: DAG3DCMBCC0 REV C cpu shorted?

ok guys so...

i decided to turn up these coils that gives power to cpu and now the cpu measurement is 2.3 ohm so thats normal

in the image that i attached see in black one coil tha gives full ground and in the blue these coils give 511 each in diode mode so i think that the mosfet or something in that line is causing the short


ill inject some voltage and i will keep you update

[mcplslg123]

Re: DAG3DCMBCC0 REV C cpu shorted?

Not shorted likely. Meter will buzz in diode mode as its supposed to be very low resistance. Measue in ohms mode and not in diode mode.

[mauareju]

Re: DAG3DCMBCC0 REV C cpu shorted?

Not shorted likely. Meter will buzz in diode mode as its supposed to be very low resistance. Measue in ohms mode and not in diode mode.

yes this measurement was in diode mode an resistance an resistance shows 0.002 ohm i think is full short

[Vesko356]

Re: DAG3DCMBCC0 REV C cpu shorted?

resistance shows 0.002 ohm i think is full short

For sure.