Ok, check again mentioned U7800 voltages.
If present, test if machine is recognized in DFU mode.
If present, test if machine is recognized in DFU mode.
-
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Macbook A2289 820-01987
- Thread starter sourcensolutionsonline@gm
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sourcensolutionsonline@gm
Member
ok will do that.
sourcensolutionsonline@gm
Member
Here are U7800 Voltages now ,\\
LDO 00 _IN = 0.004V
LDO1_IN = 1.218V UNSTABLE
LDO2_IN = 0.00V
LDO_CORE = 0.001V
LDO00 = 0.00v
LDO1=0.00V
LDO2 = 0.00V
LDO_RTC= 0.008V
LDO3=0.001V
V3P3 = 0.370V
VIN_RTC=0.812V UNSTABLE
VOUT_RTC= 0.370V
LDO 00 _IN = 0.004V
LDO1_IN = 1.218V UNSTABLE
LDO2_IN = 0.00V
LDO_CORE = 0.001V
LDO00 = 0.00v
LDO1=0.00V
LDO2 = 0.00V
LDO_RTC= 0.008V
LDO3=0.001V
V3P3 = 0.370V
VIN_RTC=0.812V UNSTABLE
VOUT_RTC= 0.370V
Did you have PPBUS_G3H and 3V3_G3H_RTC present that time?
If not, then is no reason to check U7800.
If not, then is no reason to check U7800.
sourcensolutionsonline@gm
Member
Earlier when i tested 3V3_G3H_RTC was not present, but PPBUS_G3H was always 12.26V
I dared to replace U6903 Was just for a test since then 3V3_G3H_RTC is present as well as PPBUS_G3H , But I found out U3200 gets super hot when USB Amp Meter is connected on one side , on the other side the USB Amp meter only flashes but not showing the 5V and also PP3V3_TBT_X_SX is on low resistance on diode mode to ground 0.03 and when I injected 2V from the dc power supply to see what would get hot , it happens that U2800 Gets warm, would you have any suggestions? I was thinking of changing both U3100/200 And reball U2800 to see if that would make a difference.
I dared to replace U6903 Was just for a test since then 3V3_G3H_RTC is present as well as PPBUS_G3H , But I found out U3200 gets super hot when USB Amp Meter is connected on one side , on the other side the USB Amp meter only flashes but not showing the 5V and also PP3V3_TBT_X_SX is on low resistance on diode mode to ground 0.03 and when I injected 2V from the dc power supply to see what would get hot , it happens that U2800 Gets warm, would you have any suggestions? I was thinking of changing both U3100/200 And reball U2800 to see if that would make a difference.
sourcensolutionsonline@gm
Member
Can U2800 be replaced or only reballed, U2800 PP3V3_TBT_X_SX is my problem, let me know if that chip is not an encrypted chip , so that i can either change it or reball .
Keep me posted, Thank you very much.
Keep me posted, Thank you very much.
Do you think a massage to a wood foot can help?
If U2800 is shorted to ground, can't reball it; must be replaced.
Pick it from another board, it should work; let us know.
If U2800 is shorted to ground, can't reball it; must be replaced.
Pick it from another board, it should work; let us know.
sourcensolutionsonline@gm
Member
I will definitely do that. Will keep you posted.
sourcensolutionsonline@gm
Member
I Realised that i dont have a donor , do you know where i can get U2800 for that type of Board?
Try from different board, if the chip is same...
sourcensolutionsonline@gm
Member
ok will do
sourcensolutionsonline@gm
Member
Just a quick Question i have , I found U2800 From a A1989 Macbook but both chips marked Intel E1 but the numbers are a bit different
The one that i am working on the marking is : T803A900 which is shorted , and the one i am harvesting from the A1989 marking is U803G901 Let me know if that matters before i remove it and reball it .
The one that i am working on the marking is : T803A900 which is shorted , and the one i am harvesting from the A1989 marking is U803G901 Let me know if that matters before i remove it and reball it .
Not sure...
Check at least if both have the same pads layout.
Check at least if both have the same pads layout.
sourcensolutionsonline@gm
Member
U2800 was replaced but still no 20V on my USB amp meter all the 3V3 Lines are ok included PP3V3_TBT_X_SX that was shorted earlier, Please suggest what might've been my issue.
What about PPBUS_G3H and 3V3_G3H_RTC?
sourcensolutionsonline@gm
Member
both are present
Now check U7800 mentioned voltages.
If present, test if machine is detected in DFU mode.
If present, test if machine is detected in DFU mode.
sourcensolutionsonline@gm
Member
Here s what i have now .
V3P3= 2.8V
LDO0_IN = 0.00V
LDO1_IN= 3.3V
LDO2_IN=0.00V
VIN_RTC=3.3V
LDO0=0.00V
LDO1=0.00V
LDO2=0.00V
LDO3=1.795V
LDO_RTC=1.493V
VOUTRTC=3.3V
V3P3= 2.8V
LDO0_IN = 0.00V
LDO1_IN= 3.3V
LDO2_IN=0.00V
VIN_RTC=3.3V
LDO0=0.00V
LDO1=0.00V
LDO2=0.00V
LDO3=1.795V
LDO_RTC=1.493V
VOUTRTC=3.3V
"LDO1_IN= 3.3V
..............
LDO1=0.00V"
Check diode mode to ground at LDO1; if no short, change U7800.
..............
LDO1=0.00V"
Check diode mode to ground at LDO1; if no short, change U7800.
sourcensolutionsonline@gm
Member
LDO1 = 415 in diode mode to ground, should i change U7800?