Macbook Pro a1708 820-00840 5v 40ma

[tahakxrd]

Hey all,
im a new to soldering smd i got a few ps4 repairs done. I am currently working on my own macbook pro as its gone faulty and i need assistance on what to do.
First of all it isnt liquid damaged. now thats out the way i have followed the logi wiki cd3215 bootup sequence and im unsure where to go from here.
below is the reading for each section within the sequence.
u3200

1 J3300 PP20V_USBC_XB_VBUS 5V
2 U3200 PP3V3_UPC_XB_LDO 3.3V
PP1V8_UPC_XB_LDOA 1.8V
PP1V8_UPC_XB_LDOD 1.8V
PP1V1_UPC_XB_LDO_BMC 1.1V
3 U3200 HV_GATE1 0v
U3200 HV_GATE2 10.89v
4 Q3200 PPDCIN_G3H 5.14V
5 U7000 TBA_VDDA (PPCHGR_VDDA) 0.16v
6 U7000 PM_EN_P3V3_G3H (NC_CHGR_EN_VR1) 0
7 U6903 PP3V3_G3H 0
8 U5000 PP1V2_G3H_SMC_VDDC or PP1V2_S5_SMC_VDDC 0
9 U5165 PP3V0_G3H_AVREF_SMC or PP3V0_S5_AVREF_SMC 0
10 U5000 SMBUS_SMC_4_G3H_SCL 0
U5000 SMBUS_SMC_4_G3H_SDA 0
11 U3200 USB_XB_CC1 (USBC_XB_CC1)
U3200 USB_XB_CC2 (USBC_XB_CC2)
12 J3300 PP20V_USBC_XB_VBUS
J3300 PP20V_USBC_XB_VBUS
13 J3300 HV_GATE1
J3300 HV_GATE2
14 Q3200 PPDCIN_G3H
15 R7015 TBA_AUX_DET 0
16 U7000 SMC_RST_L
17 U7000 Q7030 Q7040 opening Unknown (low maybe)


u3100

1 J3300 PP20V_USBC_XB_VBUS 5V
2 U3200 PP3V3_UPC_XB_LDO 3.39V
PP1V8_UPC_XB_LDOA 1.8V
PP1V8_UPC_XB_LDOD 1.8V
PP1V1_UPC_XB_LDO_BMC 0v
3 U3100 HV_GATE1 10.94v
U3100 HV_GATE2 7.15v
4 Q3100 PPDCIN_G3H 5.10V
5 U7000 TBA_VDDA (PPCHGR_VDDA) 5.10
6 U7000 PM_EN_P3V3_G3H (NC_CHGR_EN_VR1) 5.10
7 U6903 PP3V3_G3H 3.42
8 U5000 PP1V2_G3H_SMC_VDDC or PP1V2_S5_SMC_VDDC 0.57
9 U5165 PP3V0_G3H_AVREF_SMC or PP3V0_S5_AVREF_SMC 2.16
10 U5000 SMBUS_SMC_4_G3H_SCL 0
U5000 SMBUS_SMC_4_G3H_SDA 2.18
11 U3100 USB_XB_CC1 (USBC_XB_CC1) 0
U3100 USB_XB_CC2 (USBC_XB_CC2) 1.17
12 J3300 PP20V_USBC_XB_VBUS
J3300 PP20V_USBC_XB_VBUS
13 J3300 HV_GATE1
J3300 HV_GATE2
14 Q3200 PPDCIN_G3H
15 R7015 TBA_AUX_DET 1.27
16 U7000 SMC_RST_L
17 U7000 Q7030 Q7040 opening Unknown (low maybe)

you may notice some doesnt have no reading this is becuase theyre same as before. in addition for step 7 u6903 was not showing on diagram so i searched for a test point for PP3V3_G3H and used that reading.

I hope someone can assist me as i am in need of my macbook for university.

ps: i aint good with schematics

Thank you all

[mon2]

Re: Macbook Pro a1708 820-00840 5v 40ma

Hi.

A bit confused on the measured and posted voltage readings.

PP3V3_G3H is 0v for the U3200 post but is normal @ 3v42 for U3100 ?

Where is U6903 on this logic board? Did you mean U6990 ?

1) Confirm that U6990, pin # 2 is 3v42 = PP3V3_G3H and this is a critical rail. It must not be 0V anywhere on the logic board.

2) As per @Piernov's Logiwiki, both CD3215 USB Controller ICs must be working to allow for the power delivery contract to proceed to select 20V from your external Apple adapter over Type C connector.

The adapter operating @ 5V (default voltage) is OK to create the 3v42 rail using U6990 low current buck regulator (drops down from a higher voltage to a lower voltage).

[tahakxrd]

Re: Macbook Pro a1708 820-00840 5v 40ma

so what ive done from https://logi.wiki/index.php/CD3215_Bootup_Sequence
i took the table and tested all the points from it.
step 7 states u6903 which isnt on the board so i tested a test point of PP3V3_G3H from u7000 (illitrated in the screenshot attached. )
1) the voltage for pin 2 of u6990 is 4.84v

2 the voltage for r6999 is 3.42v

bare in mind this is on u3100 whereas on u3200 its 0v on both would this mean my cd3215 on u3200 gone bad and needs replacing