820-4924-A Missing PM_SLP_S4_L

[powerblackout]

mystery board no history!
no corrosion or liquid damage anywhere.
green light on charger, 24ma power draw.

PM_SLP_S5_L 0,0v pulses on SMC_ONOFF_L
PM_SLP_S4_L 0.0v pulses on SMC_ONOFF_L
PM_SLP_S3_L 0.0v pulses on SMC_ONOFF_L
PM_SLP_S0_L 0.0v pulses on SMC_ONOFF_L
PM_SYSRST_L 0.016v no pulse on SMC_ONOFF_L
PM_S0_PGOOD 0.00v pulses on SMC_ONOFF_L
SYS_PWROK pulses on SMC_ONOFF_L

PPBUS_G3H 12.67v
PP3V3_S5 3.3v
PP3v3_S4 0.0v
pch_intruder_l 3.3v
PM_RSMRST_L 3.3v

PPVRTC_G3H 3.34v
RTC_RESET_L 3.33v
PCH_SRTCRST_L 3.33v
PCH_INTVRMEN 3.24v
PCH_DSWVRMEN 3.24v
PCH_CLK32K_RTCX1 32k
PM_DSW_PWRGD 3.24v
PP3V3_SUS 3.33v
PM_BATLOW_L 3.33v
PM_RSMRST_L 3.33v
PM_PWRBTN_L 3.42v
PP3V3_S5RS3RS0_SYSCLKGEN 3.32v
PP3V42_G3H 3.42v
PP5V_S4 0.0v

How bad does the leading edge of the waveform for PCH_CLK32K_RTCX1 have to be to cause issues? it falls at a 90 degree angle but the rise is more of a hill.

U1900 looks great, removed and cleaned just in case.
reflowed SMC, no dice.

[powerblackout]

Re: 820-4924-A Missing PM_SLP_S4_L

nevermind, 0.6ohm short on vcore, cpu toast