Logic Board:820-00165A
It turns on without display. Vcore is missing. Rest all voltage are there.
01.All_Sys_PwrGood-3.3V
02.P1V8S3_PGood-3.3V
03.P1V05S0_Pgood-3.3V
04.DDRREG_PGood-3.3V
05.P5VS4RS3_PGood-3.3V
06.S5_PGood-3.3V
Missing
01.CPU_VCCST_Pwrgd. R1931 Pin1 has P1V05S, pin2 is zero.Resistance on R1931,pin1 is 110 Ohms,PIn2 is 0.885K.
02.U7200,PIn1 VR_EN is missing. CPU_VR_Ready is present on R1955. Resistance Value of R1800 is good.
R1931 showed incorrect value and was rusted/frozen on CPU_VCCST_PGood side. I've restored the two pads and soldered 10K Resistor. MB doesnt turn on if R1931 is soldered. If i remove R1931,it turns on without Vcore.
Can U1930 be bad or i'm on wrong path??
U1930 measurements
PIn1-PM_SLP_S3_L-3.3V
Pin2-All_SYS_PGood-3.3V
Pin4-CPU_VCCST_PG-0V
Pin6-PP3V_S5-3.3V
Have'nt done anything apart from measuring rails/voltages and replacing R1931 .
Please advise how to move further. As said earlier, i dont have much knowledge on macbooks repair
It turns on without display. Vcore is missing. Rest all voltage are there.
01.All_Sys_PwrGood-3.3V
02.P1V8S3_PGood-3.3V
03.P1V05S0_Pgood-3.3V
04.DDRREG_PGood-3.3V
05.P5VS4RS3_PGood-3.3V
06.S5_PGood-3.3V
Missing
01.CPU_VCCST_Pwrgd. R1931 Pin1 has P1V05S, pin2 is zero.Resistance on R1931,pin1 is 110 Ohms,PIn2 is 0.885K.
02.U7200,PIn1 VR_EN is missing. CPU_VR_Ready is present on R1955. Resistance Value of R1800 is good.
R1931 showed incorrect value and was rusted/frozen on CPU_VCCST_PGood side. I've restored the two pads and soldered 10K Resistor. MB doesnt turn on if R1931 is soldered. If i remove R1931,it turns on without Vcore.
Can U1930 be bad or i'm on wrong path??
U1930 measurements
PIn1-PM_SLP_S3_L-3.3V
Pin2-All_SYS_PGood-3.3V
Pin4-CPU_VCCST_PG-0V
Pin6-PP3V_S5-3.3V
Have'nt done anything apart from measuring rails/voltages and replacing R1931 .
Please advise how to move further. As said earlier, i dont have much knowledge on macbooks repair
Comment