sourcensolutionsonline@gm
Member
This Macbook Came in when i connect to USB amp meter , its stuck at 5.09V 0.89W and 0.16 amp , I proceeded to open it to check the CD3215 Chips and found at UB300 CB300 was full shorted to Ground , I managed to remove the CB300 and replaced it , I plugged again my USB AMP METER and the Behaviour remains the same , I tested CB300 again and resistance value to ground was normal .366 OHM , I Thought it might've been CB300 Was probably defective so i went ahead and changed it to a new one and behaviour still the same , So what i did i changed all the 4 CB3215 Chips to new ones and the behaviour never changed I have measured R7020 and my 5v is there, when I checked the LDOS
U3100
PP1V8_UPC_XB_LDOD = 0.020
PP1V1_UPC_XB_LDO_BMC = 0.448
PP3V3_UPC_XB_LDO = 3.350
PP1V8_UPC_XB_LDOA = 1.813
U3200
PP1V8_UPC_XB_LDOD = 1.796
PP1V1_UPC_XB_LDO_BMC = 0.023
PP3V3_UPC_XB_LDO = 3.355
PP1V8_UPC_XB_LDOA = 1.804
UB300
PP1V8_UPC_XB_LDOD = 1.815
PP1V1_UPC_XB_LDO_BMC =0.021
PP3V3_UPC_XB_LDO = 3.216
PP1V8_UPC_XB_LDOA = 0.23
UB400
PP1V8_UPC_XB_LDOD = 1.815
PP1V1_UPC_XB_LDO_BMC =0.230
PP3V3_UPC_XB_LDO = 3.216
PP1V8_UPC_XB_LDOA =1.796
I was checking on the forum and seeing that someone else that you are helping is having my same issue , another thing , since those chips come with strong underfill while removing the CD3215 I lost all the NC's pads and they left no trace at all i am not sure if they are NOT CONNECTED or please advice
Thank you
U3100
PP1V8_UPC_XB_LDOD = 0.020
PP1V1_UPC_XB_LDO_BMC = 0.448
PP3V3_UPC_XB_LDO = 3.350
PP1V8_UPC_XB_LDOA = 1.813
U3200
PP1V8_UPC_XB_LDOD = 1.796
PP1V1_UPC_XB_LDO_BMC = 0.023
PP3V3_UPC_XB_LDO = 3.355
PP1V8_UPC_XB_LDOA = 1.804
UB300
PP1V8_UPC_XB_LDOD = 1.815
PP1V1_UPC_XB_LDO_BMC =0.021
PP3V3_UPC_XB_LDO = 3.216
PP1V8_UPC_XB_LDOA = 0.23
UB400
PP1V8_UPC_XB_LDOD = 1.815
PP1V1_UPC_XB_LDO_BMC =0.230
PP3V3_UPC_XB_LDO = 3.216
PP1V8_UPC_XB_LDOA =1.796
I was checking on the forum and seeing that someone else that you are helping is having my same issue , another thing , since those chips come with strong underfill while removing the CD3215 I lost all the NC's pads and they left no trace at all i am not sure if they are NOT CONNECTED or please advice
Thank you