Re: Macbook Pro A1297 Unibody 2009..No Power
Mon little confusing between schematics and board view.
PP3V3_S0_P3V3S0FET on the board view measured between R7932 PIN 1 and C7931 Pin 1 board view shows rail PP3V3_ S5 at these components
If correct PP3V3_S0_P3V3S0FET location 1 measures 0 volts
P3V3S0_EN Pin 5 Q7912 location 2 measures 0 volts
PP3V3_S0_FET Pin 6 Q7930 location 3 measures 0 volts
P3V3S0_EN_L location 4 measured between R7930 Pin 2 and R7930 Pin 1 measures 3.28 volts
Trust this makes some sense
Losing confidence my en...
Joandaz
Member
Last Activity: 02-19-2021, 10:36 AM
Joined: 02-04-2021
Location: Doral
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Re: Macbook Pro A1297 Unibody 2009..No Power
Mon ..thank you again
PM_SLP_S4_L no voltage at Q7912
PM_SLP_S3_L 3.32 v at Q3801
SMC_PM_G2_EN 3.38 v at TP(1)SMC_PM_G2_EN
Directions out of the burrow please...Leave a comment:
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Re: Macbook Pro A1297 Unibody 2009..No Power
I continue to wade through the schematics to find why the PP5V_S0 rail is missing.
I understand that PP5V_S0 is generated from U7500
I am not seeing a voltage on P5V RTS0_EN and tracing the output back to PM_SLP_S4_L
Am I chasing rabit holes?...Leave a comment:
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Re: Macbook Pro A1297 Unibody 2009..No Power
Evening Mon, whilst checking the voltage on the Fet Legs Q7930 PP3V3_SO the PPBUS_G3H Fet Q4260 started to fry..cap looks burnt too
Will have to source a donor board and come back to you...Leave a comment:
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Re: Macbook Pro A1297 Unibody 2009..No Power
Thanks Mon
Resistance to ground readings
Pin 1 Fan jack PP5V
J5650 is 1.4 M ohms
J5660 is 1.2 m ohms
Vcore caps C7562 C7568 C7564 are 4.0 ohmsLeave a comment:
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Re: Macbook Pro A1297 Unibody 2009..No Power
Thank you Pernov...Louis Rossmann has a great Youtube clip on understanding power rail sequence..I have no power on the PP5V_S0, together with a number of shorted caps on the PPVCORE_S0...do you think it would be ok to inject a low voltage and current into the rail to find the shorted component...Leave a comment:
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Re: Macbook Pro A1297 Unibody 2009..No Power
Mon, thank you here are the measurements
Diode D6905
Voltage ground to leg 1 is 18.95v
Voltage ground to leg 2 is 8.67v
Voltage ground to leg 3 is 18.67v
Resistor R6911
Leg 2 of the resistor to test point TP1 PP18V5DC in onewire 11.08 V
TP1 PP18V5DC to TP1 Onewire Pwr En L Div 19.1 V...Last edited by Joandaz; 02-07-2021, 11:42 AM.Leave a comment:
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Re: Macbook Pro A1297 Unibody 2009..No Power
Thanks Mon,I edited the post as I was stupidly reading the wrong schematic the rail PP5V_S0 at pin 1 on the fan connector reads zero volts..Will look at your thumbnail and come back...thank you...Leave a comment:
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Macbook Pro A1297 Unibody 2009..No Power
Hi members new here to Badcaps and new to board diagnostics
The unit unit will not power up.
Mac Board 820=2610=A
The connected mag safe shows a green led
Have removed the logic board,no visible sign of cap damage,or liquid spill.
I have measured the fan jack J5650 and J5660 at pin 1
No voltage so I believe we have a PP5V_S0 rail issue
Schematics PP3V3_S0 identifies the mosfet Q7930 6 Pin should have 4 legs 1,2,5,6 at 3.3 volts.
Measuring zero volts on these legs
Legs 3,4 are powered and measure 3.3 volts from the PP3V3_S5 and PP3V3S0_SS....Last edited by Joandaz; 02-07-2021, 10:21 AM. -
Re: New Members - please post your introductions here
hello badcaps members new to board rework and wanting to seek further education in this areaLeave a comment:
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