820-2879b dead no pm_slp_s4_lg

[Yoel Ren]

hi this board came in dead, whole board lookin pristine,
ppbus_g3h 12.6v
pp3v42_g3h 3.42v ( 50k resistance to ground)
pp3v3_s5 3.3v
pp5v_s3 0v
smc_pm_g2_en 3.3v
pm_slp_S4_l 0v, (with power button shorted)
is this dead mcp ?

 

[2informaticos]

Did you check PM_SLP_S4_L reaction at same time when trigger SMC_ONOFF_L?
MCP's RTC signal good all 3?
L7750 voltage present?

 

[Yoel Ren]

yes i did, 0v, after triggering smc_on_off_l, still flat 0v no twitch at all.
rtc_rst_l : 3.2v
smc_g3h_poweron_l 0v
sm_intruder_l 3.3v
0.9v present at both side of L7750.

 

[2informaticos]

Check if PM_RSMRST_L goes high.
What about PM_BATLOW_L?

 

[Yoel Ren]

both present at 3.3v, stable.

 

[2informaticos]

Probably bad MCP; so old chip...