820-3476 doesn't turn on

werickoliveira

New member
I have a MacBook A1502 13" mid 2014 that doesn't turn on.
I have orange LED.
PPBUS_G3H = 12.56V
PP5V_S5 = the voltage fluctuates from 2.9v to 4.9v in an ever-increasing manner, the same for the PP3V3_S5 rails
rails S4 and S0 are without voltage.

Any suggestions on what to check? I'm suspicious of rails(PP5v_S5 and PP3V3_S5) as they don't maintain tension. but I don't know where to look now.
 

2informaticos

Administrator
Staff member
Any history available?

Check diode mode on all big coils.
Also check for pulse.

Test the board in SMC bypass.
 
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