Yes. 1.1V, stable.
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From post #24.
Confirm that you are measuring the proper pins for the 0V signals. The _PGOOD signals are open drain pins so there must be an external pull-up resistor to a pull-up power rail to park the _PGOOD lines.P5V_3V3G3H_EN -0V
PP3V3_G3H_T -3,3V ; this voltage is enabled so the _EN signal must be a '1' (not 0v)
P3V3MAIN_PGOOD - 0V ; this should be '1' if the output voltage rail is stable
P5VG3S_EN - 0V
PP5V_G3S - 3,3V ; this voltage is enabled so the _EN signal must be a '1' (not 0v)
P5VG3S_PGOOD - 0V ; this should be '1' if the output voltage rail is stableComment
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I think I don't understand. Should I measure voltage or not?Comment
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Yes, measure the voltage to ground again of the following:
P5V_3V3G3H_EN -0V
P5VG3S_EN - 0V
That is, the above cannot be 0V since the output voltage rails are active and stable. This implies the enable signals (above) are '1' = 3v3. Confirm it.Comment
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I can confirm that P5V_3V3G3H_EN is 0V. P5VG3S_EN is also 0V.Comment
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It seems the board definitely died. Suddenly the current draw drops to zero. Now PPBUS_G3H is missing....Comment
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What is the voltage to ground now of ppbus_g3h?
Remove all power. What is the exact resistance in ohms to ground of this rail?Comment
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I removed both fuses. PPBUS_G3H is shorted to groundComment
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0V 0ΩComment
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Which side? Is it the isl or other downstream side that is shorted?
The cpu may be the root cause but suggest to inject 1 volt (max) onto the shorted side and hunt for the part that is heating up. Remove the heatsink off the cpu for inspection.Comment
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Pin no. 2 on both F7000 +F7001 is shorted.Comment
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What is the resistance to ground of the signals listed in post #45?
Very strange that the rails are enabled yet the enable lines are logic low = disable state.Comment
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P5V_3V3G3H_EN -50kΩ
P5VG3S_EN - 50kΩComment
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Measure the voltage to ground on each leg of
R7652
R7691
Voltage to ground on pin # VREG5 (pin 29) on U7650.
Voltage to ground on pin # VREG3 (pin 22) on U7650.
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R7652 - 0V on both sides
R7691 - 0V on both sides
pin29 on U7650 is PP5V_S5_LDO - 2.5V
pin22 on U7650 is P5VP3V3_VREG3 - 3.3V
did you mean these ?Comment
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Yes. Attempt a DFU on this unit. You may have corrupt T2 firmware.
reference:
https://www.badcaps.net/forum/troubl...g3s_en-missingComment
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Mabook is not in DFU. Is this method working for A2141 ?
"Press the power button for about half a second, then also press and hold Left Control + Left Option + Right Shift for 10 seconds, then release all keys except power and hold power until the Target Mac shows up in Apple Configurator on the Host Mac"Comment
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I tried it. It doesn¨t detect in DFU. I tried both left ports.Comment
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Hi guys i have my personal MacBook Pro 2015 820-00165 board that was working fine for more than a year and one day stopped working on my original Magsafe charger. It was turning on with my bench power supply. Opened it up and while diagnosing that somehow i ended up with a shorted smc.The line which was shorted was SMC_PM_G2_EN. I removed the SMC and short was gone. So all I had was another working donor board 820-3435 which i used to program it's SMC to 820-00165 using the SMCTOOL By MuertoGB.Took that SMC and use it on my 820-00165 board .And my board started working again. PPBUS_G3H 8.56V.... -
Apple MacBook Pro A2141 X970 820-01700 Schematic & Board View...10-02-2024, 02:57 PM
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My Macbook, which had been working fine until two weeks ago, now has unstable power and won't turn on.
When I took it apart, I found a lot of dust, so I think that might be what caused the damage.
I checked with a USB meter and found that the voltage is 20V, and the current consumes a maximum of about 150mA, then fluctuates between 4 and 70mA.
The same thing happens when the battery is removed.
There were no short circuits in the PPBUS_G3H or NAND.
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Hi all, working on a MacBook Air A2179 EMC 3302 stuck on Apple Logo. Came in dead. There was spillage on both of the USB-C Charge port connector. I replaced the cap 4.7UF 25V near the speaker connector as it was corroded. Replaced USB-C connector with a new one & now I get display. The problem is that gets stuck on the Apple logo & sometimes it even boots up into OS after a very long time & the CPU fan spins fast. Kindly any repair tips will be appreciated. Do these logic board have BIOS, so that I could do a clean up or load a new dump. Thanks in advance. -
Happy Sunday everyone,
I have this Macbook Pro 15 A2141 820-01700-A stuck at 5V, it doesn't have any liquid marks or burn marks, I have carefully inspected the logic with the microscope and have not found any anomalies.
By connecting the usb-c tester I could see that it is blocked at 5v, and as a first measurement I checked PPBUS_G3H which has a voltage value of 0.8v and measured in 0.06 ohm diode mode.
I read a bit in the forum and I tried to inject 1v on the F7000 not having any current absorption, I then went up to 1.5v and I had a light current absorption (0.10Amp) and...
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