820-3476 randomly not getting P3V3S0_EN

2informaticos

Administrator
Staff member
Are you using original Magsafe 2 charger?
Don't use 1-->2 adapter.
Same thing on battery only?
 
Last edited:

bjf

Member
Yes, the same original 85W MagSafe 2 power adapter I always use.

I noticed that PM_SLP_S3_L does come up once every time I plug it in and drops down immediately.

I tried it with battery-only a number of times and it was turning on normally. But after going back to trying it on adapter-only, it's also working consistently now so I'm not sure it's telling me anything.
 

2informaticos

Administrator
Staff member
If PM_SLP_S3_l pulse only once, could be SMC sensor issue.
If starts to fail again, check if always starts in SMC bypass mode.
 

bjf

Member
Any idea which sensor it might be? Or is it just possibly one of many? The only corrosion or damage was a little bit on the battery connector and near the keyboard backlight connector.
 

2informaticos

Administrator
Staff member
If you get pulse on all coils, then can be any Isense, or Vsense sensor.
Less probable to be temp sensor...
 
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