820-00239 Not turning on

bjf

Member
Liquid-damage. Replaced R5171 and the other bad-looking components in the SMC_LID area. Has 3.4V on SMC_LID now. PPBUS at 13V. No cycling on 5V_S4. I'm attaching some pre-ultrasonic cleaning pictures. I've checked and replaced everything in the corroded areas. Not sure where to go next.
 

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2informaticos

Administrator
Staff member
"PM_SLP_SUS_L is at 0V"
That's the reason 3V3_SUS is missing.

Check RTC signals for PCH.
Does it get 32KHz?

Is PM_BATLOW_L high?
 
Last edited:

bjf

Member
I don't have an oscilloscope but I'm measuring .56V on SYSCLK_CLK32K_PCH

PPDCPRTC_PCH is at 1.1V

PCH_SRTCRST_L is at 3V

RTC_RESET_L is at 3V

PM_BATLOW_L is at 3.3V
 

2informaticos

Administrator
Staff member
"PPDCPRTC_PCH is at 1.1V"
Appears to be 3V from schematic.
Check/change C1231.
If still the same, bad CPU..

Check also PCH_INTRUDER_L.
 
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