SMC_PM_G2 PULSING - 820-4924

[lagadatorumea]

• PPBUS_G3H 12.6v
• PPDCIN_G3H 20v
• PP3V42_G3H 3.42v
• SMC_RST_L 3.3
• PP3V3_S5_AVREF_SMMC 3.3
• SMC_BC_ACOK 3.3
• PP3V3_RTC 3.3
• PCH_SRTCRST_L 3.3
• PCH_INTVRMEN_L 3.2
• PCH_DSWVRMEN_L 3.2
• PCH_CLK32K 32.768
• SMC_BC_ACOK 3.3

iSSUE:

• SMC_PM_G2 PULSING (This is the issue)
• PP3V3_S5 PULSING (This is the issue)

Any suggestions if its the SMC ?

 

[2informaticos]

Test what happens in SMC bypass.
Check diode mode to ground on all big coils and other secondary supplies.

 

[lagadatorumea]

Test what happens in SMC bypass.
Check diode mode to the ground on all big coils and other secondary supplies.

I manage to find the problem and the computer works now. by using the infrared camera. Strange the capacitor was shorted for Audio and pulsing for S_0 state. Then again, I might have missed checking what state the MacBook was in, I only checked the start-up circuit. see image for the shorted cap!

 

[2informaticos]

Good job!

Please, do NOT quote an entire post, visible few centimeters above.

 

[lagadatorumea]

Ok... master.. Thank you.. Noted that down