820-3115 b green light no turn on

andrespi

Member
hello this macbook had a short cap c7564 on ppbus_g3h, then I already resolved it, but macbook still does not turn on.there are measures


PP3V42_G3H_REG=3.48
SMC_BC_ACOK_VCC=3.47
PPBUS_G3H=12.17v at 12.5 CHANGE OF VALUE
 

2informaticos

Administrator
Staff member
So PPBUS cycles between 12.17-12.5V?
What about SMC_RESET_L, is steady high?

Check voltage and diode mode at SCL/SDA lines of battery bus.
 

andrespi

Member
NOT cycles, in each measure it changes my value, for example 1 measure= 12.3 other measure 12.4 other measure 12.3 now value was 12.9. Sometimes not green light charger, sometimes turn on fan
SMC_RESET_L=3.3V

diode modeSCL PIN 4 J6950=0.546. voltage=3.4
diode mode SDA PIN 6 J6950=0.543. voltage=3.4
 
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andrespi

Member
WHEN YOU REFER 3V3_S5/SUS IS PP3V3_S5_REG? OR PP3V3_SUS_FET?
iN THIS MOMENT NOT GREEN LIGHT
PP3V3_S5_REG=3.3V
PP3V3_S5_P3V3SUSFET=3.3
PP3V3_SUS_FET=0V
 

2informaticos

Administrator
Staff member
3V3_S5/SUS = 3v3_S5 and 3V3_SUS.

Please do not use capital letters, apart of signal names; is more dificil to read the post.

Post U7000 voltages; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.
 

andrespi

Member
1=0
2=16.23
3=3.9
9=0
12=3.4
13=3.2
14=3
15=0
17=12.6
19=5
20=5
27=16.21

I saw a small hole above the u7000 chip
 

andrespi

Member
in fuse f7040 12.9 gives that value on both sides, It must also be said that this value has measured 12.9 on other occasions 12.3 or 12.8
pin 28 the track is burned
 
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