AJay_Smoothie
New member
I'd like to know what your input would be on this one. Firstly, I have above average circuitry understanding/skills but I'm definitely no professional. That being said I've never worked on MacBooks and I'm not familiar with how they work. I have an A1706 that had components R6907 & D6902 were physically burned, but everything else on the board looks perfectly fine. There is no water damage or any other visible damage. U6903 is happily outputting 3.3V after my toasted component transfusion, but the board won't turn on. It stays at 20V @0.2A and never does anything. Here the information I was able gather so far about this board.
PPDCIN_G3H = 20V
PPBUS_G3H = 13V
PPDCIN_G3H_CHGR = 20V
PP5V_USBC_X_VCC = 5V
PP5V_S4 = 5V
PP5V_S0 = 5V
PPBUS_HS_CPU = 13V
So those in my studies of this schematic seemed to be some of the main power rails for most of the voltage regulators on board yet I'm not getting any power to the following coils/vregs/lines
PP5V_S4_X_USBC = 0V
PP5V_S4_T_USBC = 0V
(I feel like these need to be on 5V for the TBT regulator...but they don't come on. Why not? The 3215 seems to be function properly otherwise? Just conjecture on my part)
LB700 = 0V
L7210 = 0V
L7410 = 0V
L7420 = 0V
L7430 = 0V
L8410 = 0V
L3500 = 0V
But all of those systems are getting their proper voltage inputs..... I know the TBT 5V has to be very important and it's not working.
I'm extremely stumped. I cannot find a common denominator between the power supplies, or anything to do with the burned components. Ideas?
PPDCIN_G3H = 20V
PPBUS_G3H = 13V
PPDCIN_G3H_CHGR = 20V
PP5V_USBC_X_VCC = 5V
PP5V_S4 = 5V
PP5V_S0 = 5V
PPBUS_HS_CPU = 13V
So those in my studies of this schematic seemed to be some of the main power rails for most of the voltage regulators on board yet I'm not getting any power to the following coils/vregs/lines
PP5V_S4_X_USBC = 0V
PP5V_S4_T_USBC = 0V
(I feel like these need to be on 5V for the TBT regulator...but they don't come on. Why not? The 3215 seems to be function properly otherwise? Just conjecture on my part)
LB700 = 0V
L7210 = 0V
L7410 = 0V
L7420 = 0V
L7430 = 0V
L8410 = 0V
L3500 = 0V
But all of those systems are getting their proper voltage inputs..... I know the TBT 5V has to be very important and it's not working.
I'm extremely stumped. I cannot find a common denominator between the power supplies, or anything to do with the burned components. Ideas?
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