820-00244 no power

iClub

Member
Good morning, this mac has no sign of oxidation. It does not energize through the USB-c, I tried to connect through the source, the signal "connect the charger" appears, but when connecting it does not turn on.
CPU does not heat up. I imagine that u3100 is defective.

L6995 OK;
F7040 OK;
PPBUS_G3H 80mV;

u3100 diode mode
PPBUS_G3H - 0.420
PPVBUS_LIO - 0.190
PP1V8_SUS - 0.430
PP3V3_UPC_VIN - 0.586
PP5V_S4 - 0.360
PP3V3_S4 - 0.471
PP3V3_UPC_XA_LDO - 0.512
PPDCIN_G3H - 0.565
P1V2S5SW_HSMUX_EN - 0.812
PP1V8D_UPC_XA_LDO - 0.489
 

2informaticos

Administrator
Staff member
"I tried to connect through the source, the signal "connect the charger" appears, but when connecting it does not turn on"
I'm sure many other people on the forum can NOT really understand what you've wanted to say!!!

Do you get any voltage at R7020?
Check voltage and diode mode at ALL LDO rails of U3100.
 

iClub

Member
U3100 Voltage / diode mode
2 PP1V8D_UPC_XA_LDO 0V / 0.488
35 PP1V1_UPC_XA_LDO_BMC 0.15V / 0.521
53 PP3V3_UPC_XA_LDO 0V / 0.509
75 PP1V8A_UPC_XA_LDO 0V / 0.527

R7020 0V on ALL pins.
 

SMMRepair

Member
Have you tried a new USB-C port assembly?...Common for those to fail on this model, and will typically present in the way you're describing. Also make sure your trackpad/cable and battery are both good.
 
Top