Hello
I am new to this forum. My name is Marcin and i work a electric repair shop in Poland. I am new to MacBook repairs and have lot of knowledge to complete. As for now i have a MacBook pro model A1707 820-00928-04 that wont start.
I can see under my microscope that someone soldered the U3100.
I put the chip down again. I know I have a problem with the PP1V1 line nad PPBUS_G3H (0,017v, 0,402 diode-mode) but I don't know which chargers to replace . Can you please guide me were to check
I checked
Supply/LDO Rails - Diode Tests:
UB300
CB300: 3V3_G3H: Diode-Mode: 0.331
3V3_G3H: 3.415V
Diode Test on LDO Rails:
PP3V3_UPC_TA_LDO: on CB308: 3.385v, diode-mode: 0,492
PP1V8_UPC_TA_LDOA: on CB306: 1.805v, diode-mode: 0,502
PP1V8_UPC_TA_LDOD: on CB305: 1.802v, diode-mode: 0,466
PP1V1_UPC_TA_LDO_BMC: na CB304: 1,124v only in one USB port, diode-mode: 0,483
UB400
CB400: 3V3_G3H: Diode-Mode: 0.331
3V3_G3H: 3.416V
Diode Test on LDO Rails:
PP3V3_UPC_TB_LDO: on CB408: 3.383v, diode-mode: 0,486
PP1V8_UPC_TB_LDOA: on CB406: 1.803v, diode-mode: 0,502
PP1V8_UPC_TB_LDOD: on CB405: 1.792v, diode-mode: 0,467
PP1V1_UPC_TA_LDO_BMC: na CB404: 0v always, diode-mode: 0,484
U3100
C3100: 3V3_G3H: Diode-Mode: 0.332
3V3_G3H: 3.415V
Diode Test on LDO Rails:
PP3V3_UPC_XA_LDO: on C3108: 3.383v, diode-mode: 0,486
PP1V8_UPC_XA_LDOA: on C3106: 1.815V, diode-mode: 0,504
PP1V8_UPC_XA_LDOD: on C3105: 1.799v, diode-mode: 0,469
PP1V1_UPC_XA_LDO_BMC: on C3104: 1.118 only in one USB port, , diode-mode: 0,486
U3200
C3200: 3V3_G3H: Diode-Mode: 0.331
3V3_G3H: 3.414V
Diode Test on LDO Rails:
PP3V3_UPC_XB_LDO: on C3208: 3.377v, diode-mode: 0,489
PP1V8_UPC_XB_LDOA: on C3206: 1.802v, diode-mode: 0,502
PP1V8_UPC_XB_LDOD: on C3205: 1.798V, diode-mode: 0,469
PP1V1_UPC_XB_LDO_BMC: on C3204: 1.120 only in one USB port,, diode-mode: 0,485
PP20V_USBC 5.2V only where the charger is connected
I think I need to replace the UB400. I'm right ?
I am new to this forum. My name is Marcin and i work a electric repair shop in Poland. I am new to MacBook repairs and have lot of knowledge to complete. As for now i have a MacBook pro model A1707 820-00928-04 that wont start.
I can see under my microscope that someone soldered the U3100.
I put the chip down again. I know I have a problem with the PP1V1 line nad PPBUS_G3H (0,017v, 0,402 diode-mode) but I don't know which chargers to replace . Can you please guide me were to check
I checked
Supply/LDO Rails - Diode Tests:
UB300
CB300: 3V3_G3H: Diode-Mode: 0.331
3V3_G3H: 3.415V
Diode Test on LDO Rails:
PP3V3_UPC_TA_LDO: on CB308: 3.385v, diode-mode: 0,492
PP1V8_UPC_TA_LDOA: on CB306: 1.805v, diode-mode: 0,502
PP1V8_UPC_TA_LDOD: on CB305: 1.802v, diode-mode: 0,466
PP1V1_UPC_TA_LDO_BMC: na CB304: 1,124v only in one USB port, diode-mode: 0,483
UB400
CB400: 3V3_G3H: Diode-Mode: 0.331
3V3_G3H: 3.416V
Diode Test on LDO Rails:
PP3V3_UPC_TB_LDO: on CB408: 3.383v, diode-mode: 0,486
PP1V8_UPC_TB_LDOA: on CB406: 1.803v, diode-mode: 0,502
PP1V8_UPC_TB_LDOD: on CB405: 1.792v, diode-mode: 0,467
PP1V1_UPC_TA_LDO_BMC: na CB404: 0v always, diode-mode: 0,484
U3100
C3100: 3V3_G3H: Diode-Mode: 0.332
3V3_G3H: 3.415V
Diode Test on LDO Rails:
PP3V3_UPC_XA_LDO: on C3108: 3.383v, diode-mode: 0,486
PP1V8_UPC_XA_LDOA: on C3106: 1.815V, diode-mode: 0,504
PP1V8_UPC_XA_LDOD: on C3105: 1.799v, diode-mode: 0,469
PP1V1_UPC_XA_LDO_BMC: on C3104: 1.118 only in one USB port, , diode-mode: 0,486
U3200
C3200: 3V3_G3H: Diode-Mode: 0.331
3V3_G3H: 3.414V
Diode Test on LDO Rails:
PP3V3_UPC_XB_LDO: on C3208: 3.377v, diode-mode: 0,489
PP1V8_UPC_XB_LDOA: on C3206: 1.802v, diode-mode: 0,502
PP1V8_UPC_XB_LDOD: on C3205: 1.798V, diode-mode: 0,469
PP1V1_UPC_XB_LDO_BMC: on C3204: 1.120 only in one USB port,, diode-mode: 0,485
PP20V_USBC 5.2V only where the charger is connected
I think I need to replace the UB400. I'm right ?
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