820-3115 fan spin, green light, no boot

[Sr. Robot]

Hi, got an 820-3115 that has fan spin, green light, but does not boot. PCH seems to be getting warm.

PPBUS_G3H = 12.5v
PP3V42_G3H = 3.4v
PP5V_S5 = 5.1v
PP5V_SUS = 5.1v
PP5V_S3 = 5.1v
PP5V_S0 = 5.1v
PP3V3_S5 = 3.3v
PP3V3_SUS = 3.3v
PP3V3_S4 = 3.3v
PP3V3_S3 = 3.3v
PP3V3_S0 = 3.3v
PP1V8_S0 = 1.8v
P1V5_S3 = 1.5V
PP1V5_S0 = 1.5V
PP1V05_SUS = 1.05V
PP1V05_S0 =1.05v
PP1V05_S0_PCH = 1.05v
PPVCORE_S0_CPU = 0v

 

[2informaticos]

Any history available?

ALL_SYS_PWRGD stays high?
Check R7402/3 and their traces/solders.

 

[Sr. Robot]

ALL_SYS_PWRGD stays high.

R7402/3 are good and their traces/solders

 

[2informaticos]

Did you check their continuity until U7400 pins?
Post U7400 basic voltages: 46, 19/29, 47, 1, 48.

 

[Sr. Robot]

Did you check their continuity until U7400 pins? : Yes sir

U7400 basic voltages:

46 = 5.0v
19 = 5.1v
47 = 3.3v
1 = 0.5v
48 = 0.6v

 

[2informaticos]

Try known good BIOS.

 

[Sr. Robot]

Tried good BIOS, no change.

 

[2informaticos]

Check all SPI Bus Series Termination resistors and their traces.

You may have bad CPU, or PCH.