A1707 820-00281 stuck at 5v has PP3v3_g3g but no ppbus_g3h

Bruker

New member
Hello, I got this mac without water damage nor broken capacitors, firts check says 0V at charger, further inspection shows short on PP3V3_UPC_XB_LDO and PP1V8_UPC_XA_LDOD it was the same for the rest CD3215C00 when removed all of them short was gone.
Now with new chip set Mac has 5V on charger and PP3v3_g3h but I dont have PPBUS_G3H neither short on that line, no short was found around U7000 and confirmed activity on SMBUS_SMC_5_G3_SDA, SMBUS_SMC_5_G3_SCL, TBA_VDDA, TBA_VDDP, is like it does not open, so I replaced U7000 then Q7030 and Q7040 but it got the same results.

I saw chips CD has communication from MISO/MOSI, I2C_UPC, CC1/CC2 (has signal 0-1.9V dependind which side is charger connected) and all lines for TBT on 0V, I took other messures hoping of finding inconsistencies but cant be sure of how must I interprete this and how to proceed
 

2informaticos

Administrator
Staff member
First of all, welcome to the forum!

Post U7000's basic voltages: P_IN, AUX_DET, SMC_RST_IN, VDDA/P, SMC_RST*, AUX_OK, A/BMON.
Just in case, check resistance (ohm scale) over C7020/23.
 

Bruker

New member
Thanks, I appreciate the welcome and support
P_IN 5.14V
AUX_DET 1.28V
SMC_RST_IN 0V
VDDA 5.05V
VDDP 5.05V
SMC_RST* 3.42V
AUX_OK 3.41V
AMON 0v
BMON 0V
C7020/23 are 2ohms but OL when desoldered, could be SMC problem? I´ve reballed and stay the same.
 

2informaticos

Administrator
Staff member
Keep both fuses out, until you get C7050 voltage.

Check R/C7030/40 and their traces.
Also check Q7030/40 out of board if works correctly.
If still no luck, replace U7000 again.
 
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