Apple 820-3462 U7000 No Vcore PP3V3_S5_REG

It should be 8v on an air, anway you need to sort out the green light and orange light first of all the info you need for that is in this thread. It could just be the magsafe or U7000?

Regards

south657 hi,

i hav 820-3462-a,

a) the problem is, without battery if i plug the megasafe, the green light turn into amber light in few seconds without battery connect, fan not run, no voltages in the board except 12v, G3hot.

b) tps51980. 5v gone short, later the short caps removed, but still the problem remains same. & there is no other short component in the board.

c) In S5 states the PP3V3_S5_REG line should available even without power on. i suspect tps51980 gone bad might be internal short-circuit inside chip.

do u hav any idea how tps51980 works?


1) 12v is available on both side of R7402 still there is "No VCORE" but still no clue. i suspect might be problem with CPUIMVP_FBA=0v, no feedback from CPU, might be gone dry solder.
2) one more problem is there i.e, no green light appear on the adapter but FAN run continues. as i plug in adapter without battery.
3) Except vcore voltage, other voltages in the logic board are ok as per schematic.

Regards,

GL0gic

thanks & regards,
GL0gic

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