Macbook Pro A1398 - 820-3332A. No Fan Spin.

[2informaticos]

"Just 900mv on both the coils".
And is the exact voltage must be there.

Post exact voltage at L7510/20/30 in the first moment and after 10-15 seconds.
One coil is sufficient to measure.

 

[arshees]

1.118v on L7510 right from the moment it starts and steady after 20 seconds...

 

[2informaticos]

So board doesn't really boot.
VCORE should drop to 0.78V aprox, when does.

Try known good RAM module, each slot separately.

 

[arshees]

Am I missing something here.... aren't the ram modules soldered on board. how do I change the ram modules.

 

[2informaticos]

Right, I was thinking about 3330 board, sorry.

You can try to disable GPU, just in case.
The necessary information is already posted on the forum.