820-3023 no cpu vcore

[Bouba148]

Hi all

PPBUS_G3H: 8.38V
PP3V42_G3H: 3.400V
PPVRTC_G3H: 3.325V
PP5V_S5:5.122V
PP3V3_S5:3.325V
PP5V_SUS:5.119V
PP3V3_SUS: 3.325V
PP5V_S3: 5.122V
PP3V3_S3: 3.325V
PP5V_S0:5.118V
PP3V3_S0:3.319V

PP1V8_S0: 1.797V
PP1V5_S3: 1.496V
PP1V5_S3RS0:1.320V
PP1V5_S0: 1.506V
PPVTTDDR_S3: 0.747V
PPVCCSA_S0: 0.902V
PP1V05_SUS: 1.045V
PP1V05_S0: 1.052V
PP1V05_S0_PCH_VCCADPLL: 1.058V

ALL_SYS_PWRGD: 3.320V

PPVCORE_S0_CPU:0V
In diode mode red probe to gnd: 0.011V,
Resistance to gnd 14.5 Ohm when not pwered but slowly drops to 1.5 Ohm when the charger is plugged: No short to gnd for me.
In the mean time the fan speeds up to the max speed.
CPU U1000 over heating can't let the finger on it.

PPVIN_S0_CPUIMVP: jumping diretly from 2.5V to 8.40V in loop

Tomorrow I'll pass the board in an UC bath,as I see some test pads corroded around CPU. Maybe crap and corrosion under CPU.

 

[2informaticos]

"Resistance to gnd 14.5 Ohm when not pwered but slowly drops to 1.5 Ohm when the charger is plugged:"
STOP to measure continuity into powered board!!!

"PPBUS_G3H: 8.38V
PPVIN_S0_CPUIMVP: jumping diretly from 2.5V to 8.40V in loop"
???
Is the same power rail...

If CPU get very hot without any voltage on VCORE, that is bad thing.
It receives few other voltages, but should not overheat wihtout VCORE.
You could have a bad CPU now...

 

[Bouba148]

DEAD CPU!!!!!!!

You can close the topic thanks