820-00165 stucks in S5

[dudipupan]

Hi,

received a MBA 820-00165 with some liquid damage around U5110. Replaced it and found a short on PP3V42_G3H - caused by the SMC.
So I replaced the SMC, short is gone but the board stucks in S5 - missing PP5V_S4RS3, PP3V3_S4 and PM_SLP_S4_L.
G3H rails look fine.

SMC_ADAPTER_EN: 3.43V,
PM_BATLOW_L: 3.35V,
PM_SLP_SUS_L: missing,
PP_3V3_SUS: missing,
PM_RSMRST_L: missing,
PM_PWRBTN_L: 3.43V

Best regards

 

[2informaticos]

You've forgot to post exact voltage for PPBUS_G3H.
SMC_PM_G2_EN present?
Do you get 3V3_S5 at least?

Check all PCH's RTC signals (there are 4 DC signals).

 

[dudipupan]

Sorry, PPBUS_G3H is 8.59V.
SMC_PM_G2_EN is present (3.4V).
Yes, PP3V3_S5 and PP5V_S5 are present.

I forgot to mention that there was little corrosion on J6100 too.

PCH_INTRUDER_L: 3.0V
PCH_INTVRMEN: 3.22V
PCH_SRTCRST_L: 3.3 V
RTC_RESET_L: 3.3V

 

[2informaticos]

Check S5_PWRGD, PM_DSW_PWRGD and PCH_DSWVRMEN.

 

[dudipupan]

S5_PWRGD: 3.4V,
PM_DSW_PWRGD: 3.4V
PCH_DSWVRMEN: 3.2V

 

[2informaticos]

Looks like PCH issue, heat for test.

 

[dudipupan]

You were right... heated up the PCH chip and it turned on

 

[2informaticos]

Could be accumulated crap underneath.
You can try heating with quality flux.
Don't need to melt the balls, just burn the crap.