820-00164-A Dead No Liquid Damage

[BCConnection]

Green light to orange light

PP3v3_s5 present
PP5v_s5 present
No shorts on P5vS4_S3

Missing PM_SLP_S4_L

SPI area clean and pulled Bios and checked firmware its good and reading fine.

Reballed SMC just to check for corrosion under it.

Checked U1900/1950 area for corrosion. Nothing

Replaced U1900 and Crystal just in case. No change.

PCH dead?

 

[2informaticos]

3V3_SUS present?
All RTC signals OK?
Check SMC_ADAPTER_EN, PM_BATLOW_L, PCH_DSWVRMEN, PM_DSW_PWRGD.

 

[BCConnection]

3V3_SUS present?
All RTC signals OK?
Check SMC_ADAPTER_EN, PM_BATLOW_L, PCH_DSWVRMEN, PM_DSW_PWRGD.

3v3_Sus is missing as is the PM_SLP_SUS_L

SMC_ADAPTER_EN = 3.3v
PM_BATLOW_L = 3.3v
PCH_DSWVRMEN =3.1v
PM_DSW_PWRGD = 3.3v

Which RTC lines where you speaking of specifically?

 

[2informaticos]

Page 12, RTC block of U0500.
There are 4 signals, plus 32KHz oscillation coming from U1900...

 

[BCConnection]

I dont have an oscilloscope for the crystal but I can give you voltage average my MM gives me. Be back shortly with those.