820-3115 B- no liquid damage-No Boot-i5

luk812

Member
Hello !
first check:
PPDCIN_G3H is OK 16.93Volts.
second check:
PPVIN_SW_T29BST 0 Volts.
 

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  • PPVIN_SW_T29BST voltage Check 0 volts.png
    PPVIN_SW_T29BST voltage Check 0 volts.png
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  • PPVIN_SW_T29BST voltage Check 0 volts-1.png
    PPVIN_SW_T29BST voltage Check 0 volts-1.png
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luk812

Member
Q7550 problem....and fix
 

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  • Q7550 Pin3 to R7555 pin2 FIX.png
    Q7550 Pin3 to R7555 pin2 FIX.png
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  • Q7550 Pin3 to R7555 pin2 FIX OK.png
    Q7550 Pin3 to R7555 pin2 FIX OK.png
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luk812

Member
I have change SMC 980 YFC and change U7000 (by new.) now magsafe have green light blinking.... I wil check ressistances around u7000 and smc and post reply (always o volts with PPVIN_SW_T29BST)
Have you an idea?
thanks a lot
 

luk812

Member
from donor board yes..... sorry I don't have reflect for smc exchange (foulishly change smc... not a result of logical reasoning :()

.... I just ask if you can make conclusion with this mesure.....
 

luk812

Member
The measures they are in the right place?
 

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  • ACOK 1.png
    ACOK 1.png
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  • SMC_RESET_L - PIN 5.png
    SMC_RESET_L - PIN 5.png
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luk812

Member
Ok , I ca,'t to be sure that the original smc is the original smc , because, the glue around the smc was abscent, so I have think to change , to be sure it was me who replaces him...
But I'll give the original when buying...
 

luk812

Member
Original SMC, green light very low.....??
I try to boot board, no fan, no battery indicator, no boot.....
(no boot with just battery)
 
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dukefawks

Administrator
I have no idea. Same questions as previous 3V42 stable, ACOK, SMC_RESET, known good magsafe board. You need a green light before the board will do anything. If you change SMC you need to take one from identical donor board!
 

luk812

Member
another smc soldering:

magsafe board is ok (820-2565-A)
PPDCIN_G3H = beetween 16.70 and 16.93V.
SMC_BC_ACOK_VCC=beetween 3.39 and 3.46V.
SMC_BC_ACOK = beetween 2.33 and 2.38V.???
About PP3V42_G3H :

Pin 5 of U6901 is stable with 3.46Volts.


green light blinking,I think there's a problem somewhere of short to ground, I hear a slight click which is the green light that flashes...
 

luk812

Member
around U7000.png PPBUS_G3H =1.10Volts..........
On fuse F7040:
with magsafe connected only 1.10Volt, and with battery connected only 11.30Volts....
 
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