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A1278 820-2936
- Thread starter Instafixx
- Start date
Any history available?
Tried SMC bypass?
Do you note pulse on other big coils?
Tried SMC bypass?
Do you note pulse on other big coils?
Are you using 60/85W Magsafe 1 charger?
Check the sensors output on pages 49 & 50.
Check the sensors output on pages 49 & 50.
Yes, in SMC bypass.
First check if AVREF_SMC is present.
First check if AVREF_SMC is present.
Instafixx
Active member
SMC_AVREF is present 3.3V.
PBUSVSENS_EN_L 0V
PBUSVSENS_EN_L_DIV 6V
PBUS_S0_VSENSE 12.3V
SMC_PBSU_VSENSE (Couldnt check becasue on other side)
Should we trigger the power button and connect charger with bare board on desk to check voltages on the other side? will that put it into SMC bypass?
PBUSVSENS_EN_L 0V
PBUSVSENS_EN_L_DIV 6V
PBUS_S0_VSENSE 12.3V
SMC_PBSU_VSENSE (Couldnt check becasue on other side)
Should we trigger the power button and connect charger with bare board on desk to check voltages on the other side? will that put it into SMC bypass?
This board is very easy to work on desk alone.
Solder a switch with wires over any of R5015/6, to simulate power button.
Solder a switch with wires over any of R5015/6, to simulate power button.
Instafixx
Active member
1)SMC - PBuS- VSENSE - 2.25 v
2 SMC- DCIN - USENSE - 2.89 v
3) SMC - GFx - VSENSE - 0.40 v
4) SMC - CPU - VSENSE - 1.06 v
5)SMC - CPUVCCIO - SISENSE- 0.03v
6) SMC -CPU - ISENSE - 0.01 v
7) SMC - GPX - ISENSE - 0.04 v
8)SMC - CPU - HI - ISENSE 0.66V
9) SMC- BMON - ISENSE - 2.95V
10) SMC -DCIN - ISENSE - 2.3V
11) SMC - OTHER - HI - ISENSE - 0.44V
2 SMC- DCIN - USENSE - 2.89 v
3) SMC - GFx - VSENSE - 0.40 v
4) SMC - CPU - VSENSE - 1.06 v
5)SMC - CPUVCCIO - SISENSE- 0.03v
6) SMC -CPU - ISENSE - 0.01 v
7) SMC - GPX - ISENSE - 0.04 v
8)SMC - CPU - HI - ISENSE 0.66V
9) SMC- BMON - ISENSE - 2.95V
10) SMC -DCIN - ISENSE - 2.3V
11) SMC - OTHER - HI - ISENSE - 0.44V
"9) SMC- BMON - ISENSE - 2.95V
10) SMC -DCIN - ISENSE - 2.3V"
Both looks too high.
Check U7000's A/BMON levels.
Inspect R7021/2 and R7051/2 for corrosion.
10) SMC -DCIN - ISENSE - 2.3V"
Both looks too high.
Check U7000's A/BMON levels.
Inspect R7021/2 and R7051/2 for corrosion.
Post resistance (ohm scale) between pins 17/18 and 27/28 of U7000.
"No Corossion
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C7050 is 1.8kOhms"
If R7051/2 are really good, then yes you have corroded traces; or broken R7050.
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C7050 is 1.8kOhms"
If R7051/2 are really good, then yes you have corroded traces; or broken R7050.