Re: 820-00165 A1466 MacBook Air missing PPBUS_G3H

1. 16.44v

2. 4.32v

3. 16.41v

4. 16.41v

U7100 has already been replaced with new (not from donor) prior to onewire circuit being fixed to restore green light

Re: 820-00165 A1466 MacBook Air missing PPBUS_G3H

Hi mon2, thanks for responding:

1. pin1 = 0v , pin2 = 16.3v, pin3= 16.0v

2. 1.24v

3. 3.38v

4. Pin1= 50k but appears to jump up and down between 48-52k
Pin2 = 87.6k

5. 16.44v

6. 0v

7. 0v

8. 0v

9. 0v

I had identified that PP5V1 wasn't present (therefore U7100 most likely not powering up) but thats where I got stumped by trying to interpret the schematic - I'm still learning!...

Hi guys,

I'm working on an 820-00165 which had encountered fluid damage, mainly around U7100. Replaced U7100 and a couple of resistors that had corroded off the board, flux and boiled the crap away from a couple of other areas which do not appear to have any lasting damage.

Initially had no green light, diagnosed as a failed D7012, now have green light on the magsafe, but still not getting PPBUS_G3H and no fan spin. No short on PPBUS and fuse is fine.

PP5V_S5 is only 0.8v and PPDC_IN is 16.4v. Tried to decipher the scematic to work out where the rail...

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