820-2915

[nelo1012]

Board would not come on at all, Replaced L7770 and now it turns on, but now it turns on, stays on for about 2-5 seconds, then shuts right off,

any ideas?

 

[aprendiz]

85W original charger??? Battery has charge???

 

[nelo1012]

I am using a 85watt, and there is a battery plugged, but the battery may be bad,

would the mac come on without the battery with the 85watt?

I can only get it to start with the battery being plugged in, and currently do not have a second battery to test,

 

[aprendiz]

voltage on PPBUS_G3H only charger plugged in????

 

[nelo1012]

PPBUS_G3H is 8.19v,

 

[smiba]

would the mac come on without the battery with the 85watt?

Yes, as long as it is a genuine charger.

How does the SMC area look like? Any corrosion around it?

You might be missing a S0 power line or have a power line thats out of specification
When probing this make sure the fan is spinning otherwise its not in a S0 state, so you might want to keep plugging the charger in and out to keep starting it back up.
So while the fan is spinning what are the voltages of:
- PP5V_S0
- PP3V3_S0
- PP1V8_S0
- PP1V5_S0
- PP0V75_S0_DDRVTT
- PP1V2_S0
- PP1V05_S0
- PPVCORE_S0_CPU
- PPVCCSA_S0_REG

 

[dukefawks]

Firstly go get an ORIGINAL 85W charger, none of that Ebay/Amazon garbage as it will not work half the time only an original Apple one!
Measure PPBUS without a battery connected, should be 12.56V.

 

[nelo1012]

I am using original Apple 85W charger, I will get those measurements here shortly, thank you guys for the help