820-2936-b

[andrespi]

turn on, fan on, no data usb

PPCPUVCCIO_S0_REG_R=1.07
PPVCCSA_S0_REG_R=0.90
PPVCORE_S0_CPU_PH2=0v
PPVCORE_S0_CPU_PH1=0v
PPVCORE_S0_AXG_R=0v
PP1V5_S3=1.5v
PLT_RESET_L=0v

 

[2informaticos]

Missing CPU core may have various causes.
BIOS, PCH, CPU and U7400 are all involved there.
Be sure R7402 is good.

ALL_SYS_PWRGD comes high?

 

[andrespi]

ALL_SYS_PWRGD=3.2
R7402 is good also
at one end R7402 has 12.6v and at the other 0.51v is that normal?

 

[2informaticos]

That's normal.
No voltage at all at R7510/20 for sure?

 

[andrespi]

SURE THERE IS NO VOLTAGE, DIODE MODE 0.015

 

[2informaticos]

Any history available?

All the other big coils have voltage?
Compare with good board.

Just in case, try known good BIOS.

 

[andrespi]

the story is that a battery is placed in it, and after a week I return with the problem, all the voltages are in the coils except
PPVCORE_S0_CPU_PH2=0v
PPVCORE_S0_CPU_PH1=0v
PPVCORE_S0_AXG_R=0v

I already tried bios problem persists

 

[2informaticos]

Just in case, change U7400 and check all surrounding components and solders.
I suspect PCH, or CPU; be sure all voltages from page 22 are good.

You can also try to heat PCH and CPU using quality flux.