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Hi guys this time I have a 820-00163 board with no water damage or corrosion. I checked:
PPBUS_G3H 8.6v
PP3V42_G3H. 3.43v
PP5V_S5 5v
PP3V3_S5. 3.3v
PP5V_S4RS3. 0v
PLT_RESET_L 0v
PM_PCH_SYS_PWROK 0v
SMC_ONOFF_L 3,43v
PM_PWRBTN_L 3,42v
PM_SLP_S4_L 0v
PM_SLP_S3_L 0v
When you connect charger, PM_SLP_S4_L pulses in cycle, or just two times?
If pulses at least once, all S3 voltages should pulse at same time.
Also check for pulse at PM_SLP_S3_L and S0 voltages.
Any pulse at ALL_SYS_PWRGD?
Looks like PCH issue, as PLT_RESET_L dpesn't pulse at all.
You should check all SPI Bus Series Termination resistors and their traces.
Also try known good BIOS, just in case.