waterchill
Member
Good day friends, so I have here this MacBook which is drawing 20V 180mA only the Mainboard and 1,4A with battery. No Apple logo no boot. Here are some voltages:
PPBUS_G3H = 8,70V
PP3V3_G3H = 3,30V
PPDCIN_G3H = 19,7V
PP3V3R3V0_AON = 3,3V
PP5V_G3H = 5,1V
PP5V_S4 = 5,1V
PP5V_S0 = 5,1
PP3V3_S5 = 3,3V
PP3V3_SUS = 3,3 V
PP3V3_S4 = 3,3 V
PP3V3_S0 = 3,3V
PP1V8_SUS = 1,8V
PP1V8_S3 = 1,8V
PP1V5_S0 = 1,5V
I found out that PPVCORE_S0_CPU = 0V / 10,5ohms. Checked this with a 2017er MacBook resistance is same but 0,635V. So I have checked:
VCIN of U7210 and U7230 = 5,10V
VIN of U7210 and U7230 = 8,70V
ZCD_EN = 0V = CPUCORE_FCCM
CPUCORE_FCCM is produced by U7100
VIN of U7100 = 8,7V
VCC of U7100 = 5,1V
I don't see an enable pin for U7100. Schematics says for VIN 12,9V I got 8,7V, maybe this is problem or bad U7100? Or something else?
cheers
PPBUS_G3H = 8,70V
PP3V3_G3H = 3,30V
PPDCIN_G3H = 19,7V
PP3V3R3V0_AON = 3,3V
PP5V_G3H = 5,1V
PP5V_S4 = 5,1V
PP5V_S0 = 5,1
PP3V3_S5 = 3,3V
PP3V3_SUS = 3,3 V
PP3V3_S4 = 3,3 V
PP3V3_S0 = 3,3V
PP1V8_SUS = 1,8V
PP1V8_S3 = 1,8V
PP1V5_S0 = 1,5V
I found out that PPVCORE_S0_CPU = 0V / 10,5ohms. Checked this with a 2017er MacBook resistance is same but 0,635V. So I have checked:
VCIN of U7210 and U7230 = 5,10V
VIN of U7210 and U7230 = 8,70V
ZCD_EN = 0V = CPUCORE_FCCM
CPUCORE_FCCM is produced by U7100
VIN of U7100 = 8,7V
VCC of U7100 = 5,1V
I don't see an enable pin for U7100. Schematics says for VIN 12,9V I got 8,7V, maybe this is problem or bad U7100? Or something else?
cheers