Martinvegeta66
Member
I am fixing a mac book pro model A2141, the motherboard model is
820-01700
At first when I connect the USB-C charger the voltage was only 5v, then
I check the pin VIN_3V3 C20 on U3100 line
PP3V3_G3H_RTC_X = 0 volts
PP3V3_G3H_RTC_X is provide by U6940
Checked EN E4 line on U6940
CHGR_EN_MVR_R= 0.5 v, too low to work ok
Check CHGR_EN_MVR for shorts but its ok
CHGR_EN_MVR_R coming from U7000
Check all voltages in U7000, everything its OK but CHGR_EN_MVR its low voltage
Then I replaced U7000
U7000 replaced and now I have 20.15 v and 0.032A to 0.036 A on the input but MacBook don’t start
PP5V_S4_X_USBC = 0v
UPC_X_5V_EN_R = 0V
PM_RSMRST_L = 0V
UPC_X_5V_EN = 0V
PP1V8_SLPS2R = 1.8V
PP3V3_S5 = 0V
PP3V3_G3H_SOCPMU = 3.36v
PP1V8_SLPS2R_PMUVDDGPIO = 1.8v
PMU_VDD_HI = 12.62v
PVCCPRIMCORE_SW0 = 0v
PVCCPRIMCORE_SW1 = 0v
PVCCPRIMCORE_FB = 0V
PPVCCPRIM_FETIN = 0V
Check all these lines for shorts but they are ok, specially the line PP3V3_S5 = 0V
Do I need to replace U7800? This U7800 can be purchased new or I need to get it from a donor MacBook? Thank you very much for your support.
820-01700
At first when I connect the USB-C charger the voltage was only 5v, then
I check the pin VIN_3V3 C20 on U3100 line
PP3V3_G3H_RTC_X = 0 volts
PP3V3_G3H_RTC_X is provide by U6940
Checked EN E4 line on U6940
CHGR_EN_MVR_R= 0.5 v, too low to work ok
Check CHGR_EN_MVR for shorts but its ok
CHGR_EN_MVR_R coming from U7000
Check all voltages in U7000, everything its OK but CHGR_EN_MVR its low voltage
Then I replaced U7000
U7000 replaced and now I have 20.15 v and 0.032A to 0.036 A on the input but MacBook don’t start
PP5V_S4_X_USBC = 0v
UPC_X_5V_EN_R = 0V
PM_RSMRST_L = 0V
UPC_X_5V_EN = 0V
PP1V8_SLPS2R = 1.8V
PP3V3_S5 = 0V
PP3V3_G3H_SOCPMU = 3.36v
PP1V8_SLPS2R_PMUVDDGPIO = 1.8v
PMU_VDD_HI = 12.62v
PVCCPRIMCORE_SW0 = 0v
PVCCPRIMCORE_SW1 = 0v
PVCCPRIMCORE_FB = 0V
PPVCCPRIM_FETIN = 0V
Check all these lines for shorts but they are ok, specially the line PP3V3_S5 = 0V
Do I need to replace U7800? This U7800 can be purchased new or I need to get it from a donor MacBook? Thank you very much for your support.
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