A1418/A1419 Power Supply

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A1418

A1419

All graphs with display off and iMac on. Please note that the 12V rail can appear stable when these power supplies are failing. Pulsing on pin 1 and pin 3 being high seem to be signs of the power supply failing.

12V

 
A1419 P 12V Good
 
A1419 12V Shutting Down

Pin 1: PWR_BTN_R (Pulled up to PP3V42_G3H)

 
A1419 Power Pin 1 Good
 
A1419 Power Pin 1 Shutting Down

Pin 2: Ground
Pin 3: SMC_ACDC_ID_R (Pulled up to PP3V3_S0)

 
A1419 Power Pin 3 Good
 
A1419 Power Pin 3 Shutting Down

Pin 4: TSNS_ACDC_N

 
A1419 Power Pin 4 Good
 
A1419 Power Pin 4 Shutting Down

Pin 5: TSNS_ACDC_N

 
A1419 Power Pin 5 Good
 
A1419 Power Pin 5 Shutting Down

Pin 6: Ground
Pin 7: BURSTMODE_EN_R_L (Pulled up to PP3V3_S4)

 
A1419 Power Pin 7 Good
 
A1419 Power Pin 7 Shutting Down