macbook air 820-3024-B green light no fan spin

[mon2]

Re: macbook air 820-3024-B green light no fan spin

i just measure that PP1V05_S0 is short to ground.. is it ok?

Please post the exact resistance that is measured on this rail.

In general, the voltage rails (such as this one) will have a low resistance but need to know the exact value you are reading.

[kingskie]

Re: macbook air 820-3024-B green light no fan spin

i am so desperate, this macbook already 1 month in my hand and no solution.

i just replace again the U7201 and i got 4.64V on PP5V_S5

and i did some measurement and found out that PP3V3_SUS is shorted to ground..
and suggestion?

[kingskie]

Re: macbook air 820-3024-B green light no fan spin

update..
i injected 2v into the PP3V3_SUS and U1800 is hot...i think that i the culprit .
any comment?

[mon2]

Re: macbook air 820-3024-B green light no fan spin

Will check the schematics upon reaching the office later today but what is u1800?

By the label, this is the 3v3 rail for suspend mode of the computer?

A power regulator?

Confirm the resistance of this power rail. What is the value?

Could be a defective u1800 but wait for other feedback.

[kingskie]

Re: macbook air 820-3024-B green light no fan spin

Will check the schematics upon reaching the office later today but what is u1800?

By the label, this is the 3v3 rail for suspend mode of the computer?

A power regulator?

Confirm the resistance of this power rail. What is the value?

Could be a defective u1800 but wait for other feedback.

U1800 is PCH
2.2ohm for PP3V3_SUS