Is this measurements ok?
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What is the voltage to ground of SSD_PMU_RESET_L? If at 0v, continue to measure the following points of interest:
(in order of the power up sequence chart - report any that are at 0v; continue otherwise to check each)
P5V_3V3G3H_EN
PP3V3_G3H_T
P3V3MAIN_PGOOD
P5VG3S_EN
PP5V_G3S
P5VG3S_PGOOD
P1V8G3S_EN
P3V3G3S_EN
Comment
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SSD_PMU_RESET_L - 1,8VComment
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P5V_3V3G3H_EN -0V
PP3V3_G3H_T -3,3V
P3V3MAIN_PGOOD - 0V
P5VG3S_EN - 0V
PP5V_G3S - 3,3V
P5VG3S_PGOOD - 0V
P1V8G3S_EN - 0V
P3V3G3S_EN - 0VComment
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Some of these measurements do not look correct. If you have a power rail then the _EN signals must be '1'. If you have the measured power rails then the _PGOOD should be '1'.
Review the following to double-check each:
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Hello, sorry for delay.
PMU_PVDDMAIN_EN - 0V
P5V_3V3G3H_EN - 0V
P5VG3S_EN - 0V
P3V3MAIN_PGOOD - 0V
P5VG3S_PGOOD - 0VComment
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PP3v3_G3H_SOCPMU (measured on C7893/C7869) - 3.3VComment
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Confirm the voltage to ground on each side of R7652.P5V_3V3G3H_EN -0V
Remove all power and confirm the resistance across R7652 which should be ~3k3 ohms.Comment
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0V on each side of R7652.
Resistance is about 3,2kΩComment
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What is the voltage to ground of PPBUS_G3H @ F7000 / F7001? Is it stable?Comment
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Both are exactly 12.3V/stable.Comment
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I also checked voltage on R7900 (I read on forum that sometimes this resistor is the problem.) There is 3.3V on both sides.Comment
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Confirm the voltage to ground on:
R6968 ; CHGR_EN_MVR_R / CHGR_EN_MVR
R6934 / R6935 ; PP3V3_G3H_RTC_REG_R / PP3V3_G3H_RTC_X
Comment
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R6968 - 5.1V on both sides.
R6934 / R6935 - 3.3V on both sides.Comment
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Good. Onto steps 6 & 7.
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PP3V0_G3H_RTC - 3V
PCH_CLK32K_RTCX1 - 0.5VComment
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Should I continue with next measurements?Comment
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Yes.Comment
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Step 8 - PCH_RTC_RESET_L - 3V
Step 9 - PMU_XTAL1 - 0V / PMU_XTAL2 - 0.6V
Step10 - PP3V3_G3H_T - 3.3V
Step 11 - PP1V8_SLPS2R - 1.8V
Step 12 - PMU_CLK32K_SOC - 0.8V
Step 13 - PP1V8_AWAKE - 1.8V
Step 14 - PP1V8_SLPS2R_PMUVDDGPIO - 1.8V
Step 15 - PP1V1_SLPS2R - 1.1V
Step 16 - PP0V8_SLPS2R - 0.8V
Step 17 - PP0V82_SLPDDR - 0.8V
Step 18 - PP3V3 _AWAKE - 3.3V
Step 19 - PPVDDCPUSRAM_AWAKE - 0.8V
Step 20 - PP0V9_SLPDDR - 0.9V
Step 21 - P1V1_SLPDDR_SOCFET_EN - 1.8V! (is it OK?)
Comment
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Step21 - this is the enable pin for the loadswitch @ U7901. The enable voltage can be different than the operating voltage of the switch.
Confirm the voltage to ground on U7901, pins #3 and #5. Are they stable @ 1v1 for each? Then this is ok.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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