hi all,
i have a mbp a1278 and when i connect the ac adapter the fan spins for a sec and goes off. This happens in a loop the machine comes on and then turns off.
3.3volts and 12.58volts g3_3.42volts all okay.battery also charges good.
what i notice that when it turns on for 2 sec all power planes come on for a while 1.8v,5v,1.05v,0.9v but only cpu vcore not coming.i checked vr_on signal okay.i changed the firmware also, no luck.
Please anyone know of this problem why it starts and then turns off.what signal do we check for vcore cpu.
thanks