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820-3208 No turning on, fan spins 1 seg every 5 seg.

punkieftw

punkieftw

New member
Hi, i have a macbook air 820-3208 here.

measures:

PPBUS_G3H @ R6920 8,37v (8,34v when fan spins thats one seg)
PPVIN_SW_TBTBST @ C3891 0,94v to 1,90v fluctuating every seg
PPBUS_S5_HS_COMPUTING_ISNS @ C7516 8,37v (8,36-8,35 when fan spins)
PPBUS_S5_HS_OTHER_ISNS @ C7200 8,37v (8,35v when spins)
PPDCIN_G3H_ISOL @ R6905 16,93v (16,88v when spins)
PP3V42_G3H @ R5077 3,42v stable
PPVRTC_G3H @ R1801 3.33v stable
PP5V_S5 @ L5720 5,01v (5,12 when spins)
PP5V_SUS @ C7840 5,05v stable
PP3V3_S5 @ C9480 3,33v stable
SMC_RESET_L @ R5000 3,38v stable

green light and orange light but no turning on, no spin continuosly.
 
larossmann

larossmann

Administrator
Staff member
We do sleep from time to time!

Where was the liquid?

No pulsing on CPU vcore is no good.

What does U2700 area look like? How high does SYSCLK_CLK32K_RTC voltage spike? What's the resistance between pins 17/18 on U7000? Do you have any short circuits to ground on PP3V3_S0 and other S0 rails?

On everything before 2013 most common quarter fan spin causes are clock and battery-side current sensing on the ISL6259, but usually that does come with CPU vcore - so I'll be waiting for you to tell me where the corrosion was so we can go further.
 
punkieftw

punkieftw

New member
larossmann said:
We do sleep from time to time!

Where was the liquid?

No pulsing on CPU vcore is no good.

What does U2700 area look like? How high does SYSCLK_CLK32K_RTC voltage spike? What's the resistance between pins 17/18 on U7000? Do you have any short circuits to ground on PP3V3_S0 and other S0 rails?

On everything before 2013 most common quarter fan spin causes are clock and battery-side current sensing on the ISL6259, but usually that does come with CPU vcore - so I'll be waiting for you to tell me where the corrosion was so we can go further.
Click to expand...

Liquid was spill near the spi area and the U6210 area but not to much... the area around the U2700 looks aceptable.. have some red points but nothing serious.. The SYSCLK_CLK32K_RTC At pin 12 of the U2700 have 0.43v stable.. The resistance between pin 17/18 on U7000 is 03.0 ohms .. On PPVCORE_S0_CPU have 03,3 ohms.. :(
 
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