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Macbook Air 820-00165 no fan

arnonabuurs

arnonabuurs

New member
I have a 820-00165 with green/orange light no fan. Superclean board looks like new, not 1 corroded probe points at all.

PPBUS_G3H = 8.57
PP3V42_G3H = 3.42
PP5V_S5 = 5v
PP5V_S4RS3 = 0v (no pulse)
PP3v3_S5 = 3.34
PP3v3_S4 = 0.322v @ C4841
but at U1950 pin 1 = 0v, no short on these lines though
PPVRTC_G3H = 3.34
U6100 Pin 8 = 3.34v

What could cause the low voltage at R8000 pin 1/2 from 0.322v? At C8000 I do have 3.4v so the IC gets power. All looks brandnew.

PS checked also all SPI ROM resistors for correct OHM. Looks all clean too.
 
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arnonabuurs

arnonabuurs

New member
No history other then it stopped working. I found a short at PPVCC_S0_CPU. Should i look to get PP5V_S4RS3 working, or find this short first? Can i just add 1.8v on this line to find the short? Or, better move on to the next board?
 
arnonabuurs

arnonabuurs

New member
I get 7-8 ohm

Some extra info:
when switch on the charger I get 2 x 3.3V power cycle on L7520 and after that it drops to 0
Checked 32KHz is coming from the Clock Chip
 
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