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A1278 820-3115-B no green light

H

hgoncalves

Active member
I have an A1278 820-3115-B that has no power.
I don't get green light or fan spin.

I have 3.4V on PP3V42_G3H
3.4V on SMC_BC_ACOK_VCC
3.3V on SMC_BC_ACOK
3.4V on R6929

U6900:
3.4 V Sys_onewire
18V Adapter sense
3.4V SMC_BC_ACOK_VCC

Already tried with new charging port.
Can you help?
 
Last edited:
H

hgoncalves

Active member
You're right.
The charging port was shorted (but strangely i've alreay tried before with other port with the same result), and after replacing it, now i get green light but no power or fan spin. Going to check major rails now.
 
2informaticos

2informaticos

Administrator
Staff member
Don't think you can get different readings in different test points of PPBUS_G3H.
Also, once you get correct PPBUS_G3H, no reason to check DCIN.
Avoid wasting time in the future.

Post SMC_PM_G2_EN level; does it oscillate?
Check for short and voltage pulse at all big coils.
Try to start in SMC bypass mode.
 
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