820-2915: Missing PM_SLP_S4_L

[ViBe]

820-2915 board has a missing PM_SLP_S4_L signal and I could use some help. Draws a steady .03A.

Here's what I've recorded so far:

Diode mode on PM_SLP_S4_L - .516

PPBUS_G3H - 12.6V
PP3V42_G3H - 3.48V
PP5V_S5 - 5.01V
PP3V3_S5 - 3.35V

PP3V3_SUS - 3.355V
PPVRTC_G3H - 3.358V
RTC_RESET_L - 3.352V
S5_PWRGD - 3.445V
PM_PCH_SYS_PWROK - 0V
PM_SUS_EN - 3.358V
PM_SLP_SUS_EN - 3.358V
PM_BATLOW_L - 3.353V
PM_DSW_PWRGD - 3.475V
PM_RSM_RST_L - 3.324V
PLT_RESET_L - 0V

PCH_DSWVRMEN - 3.232V
PCH_SRTCRST_L - 3.352V
PCH_INTRUDER_L - 3.051V
PCH_INTVRMEN_L - 3.251V

SMC_ADAPTER_EN - 3.462V
SMC_RESET_L - 3.48V
SMC_ONOFF_L - 3.477V

 

[2informaticos]

Any history available?
Did you try to start in SMC bypass mode?

Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L, at same time?
If present, then check for pulse at PM_SLP_S4_L too.

 

[ViBe]

Customer board, arrived with two small ding'd areas from a blunt force. One, a small section of PCB-layers missing missing off the corner beneath the audio jack, and the other a small crack through the board, right next to J6955. Sounds much worse than it looks. Two small dings that only seem to affect the audio jack.

Does not start in SMC bypass mode.

Trigger of SMC_ONOFF_L drops PM_PWRBTN_L to 4.8mV, and PM_SLP_S4_L spikes to 305mV.

 

[2informaticos]

Puff, probably wasting time.
This board has 8 copper layers; any crack could be fatal.

You should be able to catch higher pulse.
Trigger more times SMC_ONOFF_L and check each time for pulse at all PM_SLP_Sx_L signals.

 

[ViBe]

Thanks. I'll check for the other pulses and call it done. I appreciate your guidance.