Greetings everyone.
I've been trying to resolve the above problem, I need insight into the next step to take. This will be my first time handling this kind of machine hence, any replacement part will need to be ordered for since I do not have replacement parts.
readings on the MB:
PPBUS_G3H is present (12.23v)
PP3V3_G3H is present (3.27v)
PP1V8_SLPS2R is present (1.7v)
The C-ports behavior:
The port that communicated with U3200 delivered the above readings although the u3900, u3100, u3200 regions warmed up.
However, the port that communicated with the u3100 delivered different readings- PPBUS was 1.7V, PP3V3 is 0. but the voltage at the USB meter still reads 5V, 0.43A
I found out PP3V3_UPC_XA_LDO on U3100 read 26ohms to ground, it remains the same after I removed C3108. While PP3V3_UPC_XB_LDO on U3200 read 1.3k to ground. But the voltage reading at u3200 is 3.3V while at u3100 is 2.3V
I'm stuck at which step to take next:
Do I replace the U2890 or U3100 or attempt DFU mode so as to reprogram the T2 security chip, or should I remove the U4770 and reprogram it?
I have a EZP2019 programmer, I think it should be able to read and write on the U4770 chip, but I couldn't lay my hands on the firmware yet.
Please, what would you advise?
Thanks
background information on the PC:
The charger was shaky, it indicated charging not charging, an attempt was made to adjust the charger perhaps it would stabilize, but a sparking sound was heard. the PC was unplugged, but the charging notification was still on despite the fact that the PC had been unplugged.
Owner said the battery was not charging at all, it decreases even when the PC is plugged in, but the notification says the PC was charging. He attempted PRAM/SMC reset but the PC died afterward
I've been trying to resolve the above problem, I need insight into the next step to take. This will be my first time handling this kind of machine hence, any replacement part will need to be ordered for since I do not have replacement parts.
readings on the MB:
PPBUS_G3H is present (12.23v)
PP3V3_G3H is present (3.27v)
PP1V8_SLPS2R is present (1.7v)
The C-ports behavior:
The port that communicated with U3200 delivered the above readings although the u3900, u3100, u3200 regions warmed up.
However, the port that communicated with the u3100 delivered different readings- PPBUS was 1.7V, PP3V3 is 0. but the voltage at the USB meter still reads 5V, 0.43A
I found out PP3V3_UPC_XA_LDO on U3100 read 26ohms to ground, it remains the same after I removed C3108. While PP3V3_UPC_XB_LDO on U3200 read 1.3k to ground. But the voltage reading at u3200 is 3.3V while at u3100 is 2.3V
I'm stuck at which step to take next:
Do I replace the U2890 or U3100 or attempt DFU mode so as to reprogram the T2 security chip, or should I remove the U4770 and reprogram it?
I have a EZP2019 programmer, I think it should be able to read and write on the U4770 chip, but I couldn't lay my hands on the firmware yet.
Please, what would you advise?
Thanks
background information on the PC:
The charger was shaky, it indicated charging not charging, an attempt was made to adjust the charger perhaps it would stabilize, but a sparking sound was heard. the PC was unplugged, but the charging notification was still on despite the fact that the PC had been unplugged.
Owner said the battery was not charging at all, it decreases even when the PC is plugged in, but the notification says the PC was charging. He attempted PRAM/SMC reset but the PC died afterward
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