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macbook pro 820-4924-a dead green and orange light on,no fan.

2informaticos

2informaticos

Administrator
Staff member
You have correct 1V05 voltage.
Why are you surprised for its boost voltage???
Should be 5v higher, exactly what you've got.

Do you use original Magsafe 2 60/85W charger for sure?
Is PM_BATLOW_L steady high?
 
Y

yair37

Member
PM_BATLOW_L:
when PM_SLP_S4_L 3.4v its 1.1v
0v when PM_SLP_S4_L is missing

Do you use original Magsafe 2 60/85W charger for sure?
yes
 
2informaticos

2informaticos

Administrator
Staff member
PM_BATLOW_L should be steady high.
Reball SMC.

Also check SMC_BC_ACOK.
First, see if board starts with both battery and charger connected.
 
Y

yair37

Member
update..i was reball SMC after i was connect just the charger the fan start immediately (maybe the reball heat) i then connect it to the board but nothing! still dead..
again PM_SLP_S3 sometime 3.4v and sometime missing...
SMC_BC_ACOK 0v when PM_SLP_S3 IS 0V and when its 3.4v the SMC_BC_ACOK is 5.2v
 
2informaticos

2informaticos

Administrator
Staff member
"SMC_BC_ACOK is 5.2v"
Are you sure???

CHGR_ACIN stable 4V aprox?
If yes, change U7100.
If not, check if CHGR_DCIN is stable.
 
Y

yair37

Member
my mistake:
PM_SLP_S3 0v - SMC_BC_ACOK 3.4v
PM_SLP_S3 3.4v - SMC_BC_ACOK 3.4v
CHGR_ACIN 3.9v when PM_SLP_S3 is 3.4v
change u7100?

???????
 
2informaticos

2informaticos

Administrator
Staff member
"CHGR_ACIN 3.9v"
Always???
Should be if, SMC_BC_ACOK is always high (3.4V).

"ppbus 3gh 0.5v"
Now post diode mode to ground at PPBUS_G3H and 3V42_G3H.

Did you make some short between U7100 pins?
Always try to use pins of surrounding components, when you want to measure voltage on a QFN chip...
 
Y

yair37

Member
"Now post diode mode to ground at.." no charger connected
PPBUS_G3H - 1900+
3V42_G3H - 1900+
change u7100 with new one...
still PPBUS 0.5V
 
Last edited:
Y

yair37

Member
3v42 3.4v
pins:
1. 15v up and down
2. 0.5v
3. 0v
9. 1.8v
12. 3.4v
13. 3.4v
14. 0v
15. 0v
19. 0v
20. 0v
28. 15.4v
 
Y

yair37

Member
D7105 DIDN'T SIT WELL SO NOW...
D7105 16.5V
R7105 1-16.5V 2-2.1V
1. 15v up and down
2.2.1v diode mode no charge (600)
3. 0v
9. 0v
12. 3.4v
13. 3.4v
14. 0v
15. 0v
19. 0.9v
20. 1.2v
28. 15.4v
 
2informaticos

2informaticos

Administrator
Staff member
"R7105 1-16.5V 2-2.1V"
Burnt, change it.

Don't forget to check diode mode to ground at pin 2/U7100; BEFORE applying power to the board.
If too low (as supposed), change U7100.
Just in case, remove and check C7105 first.
 
Y

yair37

Member
we back to business..orange light back ppbus is on!
chack again:
PM_SLP_S3 3.3v - SMC_BC_ACOK 3.4v
CHGR_ACIN 3.9v
i was just changed u7100/r7105/c7105
 
2informaticos

2informaticos

Administrator
Staff member
TBT volyage not interesting, unless you connect aThunderbolt device.

So you get VCORE and all voltages from pages 61/63?
PLT_RESET_L is high?
 
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