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820-00923 not turning getting .026 A
- Thread starter 2click
- Start date
Practically same signals and voltages like old boards, for power on sequence.
But now PMIC is involved too.
Do you get 3V3_S5/SUS?
What about PCH's RTC signals?
But now PMIC is involved too.
Do you get 3V3_S5/SUS?
What about PCH's RTC signals?
2click
Member
I don´t have PP3V3_G3H, there is a weird thing, on D6902 at both pins I get low voltages going further down while powered on and with a .025A consumption.
Another weird thing is that I replaced U7000 and while the board was still a little hot, it went to its normal .700A of consumption, I disconnected and changed to the other port and it just got .025A, then return to the same port in which it turned on and again getting .025A. What could be happening?? Should I inject voltage on that line to see if there is something wrong?
UPDATE: waited a few minutes and connected it to the usb c port which worked the first time, it went to .700A, connected it to the other usb c and goes to .025A and 0A repeatedly. If I go back to the usb c which worked right away it starts doing the same behavior...
Another weird thing is that I replaced U7000 and while the board was still a little hot, it went to its normal .700A of consumption, I disconnected and changed to the other port and it just got .025A, then return to the same port in which it turned on and again getting .025A. What could be happening?? Should I inject voltage on that line to see if there is something wrong?
UPDATE: waited a few minutes and connected it to the usb c port which worked the first time, it went to .700A, connected it to the other usb c and goes to .025A and 0A repeatedly. If I go back to the usb c which worked right away it starts doing the same behavior...
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Looks like something reacted to heat, when you've changed U7000.
Maybe bad solders on it, or problems under other BGA chip.
Can you post D6902 voltages, when no 3V3_G3H present?
Better to post also U6903 voltages.
Maybe bad solders on it, or problems under other BGA chip.
Can you post D6902 voltages, when no 3V3_G3H present?
Better to post also U6903 voltages.
2click
Member
with .026A and no PP3v3_G3H
D6902
PIN 1 = 1.4v
PIN 2 = .224
Both pins slowly going down....
U6903
PIN 1 = .100V (going down)
PIN 2 = .1.100 (going down)
PIN 3 = 0
PIN 4 = 0
PIN 5 = 0
PIN 6 = 0
PIN 7 = 0
PIN 8 = 0
PIN 9 = 0
PIN 10= .080
Picture 1 = Connected the usb c after a couple hours that I left the board on my desk
Picture 2 = Disconnected the usb c and reconnected it a few seconds after it was on
** values taken when it was at .026 A**
New discovery...
when I connect the usb c it seems to charge some capacitor or something on the line PPVBAT_G3H_CHGR_R because right when I disconnect the charger, if I measure for continuity on that line, it has continuity to ground but after a couple seconds it goes away and in that case the board will start on any of the usb c ports, I just need to make sure that the short is gone and if I connect it, it will work... I just don´t know how to figure what is making that happen...
D6902
PIN 1 = 1.4v
PIN 2 = .224
Both pins slowly going down....
U6903
PIN 1 = .100V (going down)
PIN 2 = .1.100 (going down)
PIN 3 = 0
PIN 4 = 0
PIN 5 = 0
PIN 6 = 0
PIN 7 = 0
PIN 8 = 0
PIN 9 = 0
PIN 10= .080
Picture 1 = Connected the usb c after a couple hours that I left the board on my desk
Picture 2 = Disconnected the usb c and reconnected it a few seconds after it was on
** values taken when it was at .026 A**
New discovery...
when I connect the usb c it seems to charge some capacitor or something on the line PPVBAT_G3H_CHGR_R because right when I disconnect the charger, if I measure for continuity on that line, it has continuity to ground but after a couple seconds it goes away and in that case the board will start on any of the usb c ports, I just need to make sure that the short is gone and if I connect it, it will work... I just don´t know how to figure what is making that happen...
Attachments
Last edited:
Looks like missing R7020 voltage in that moment.
Same behaviour on all USB-C ports?
Compare diode mode readings on all input MOSFETs (Q3100, etc).
Same behaviour on all USB-C ports?
Compare diode mode readings on all input MOSFETs (Q3100, etc).
2click
Member
DIODE MODE
Q3100
1,2,3,4 = .650
5,6 = .180
7,8 = .560
Q3200
1,2,3,4 = .650
5,6 = .180
7,8 = .560
QB300
1,2,3,4 = .650
5,6 = .180
7,8 = .560
QB400
1,2,3,4 = .650
5,6 = .180
7,8 = .560
yes all usb c where doing the same, I started removing capacitors on the line PPVBAT_G3H_CHGR_R and now it hasn´t turned on it is only getting .025 A and down to 0 A again...
Q3100
1,2,3,4 = .650
5,6 = .180
7,8 = .560
Q3200
1,2,3,4 = .650
5,6 = .180
7,8 = .560
QB300
1,2,3,4 = .650
5,6 = .180
7,8 = .560
QB400
1,2,3,4 = .650
5,6 = .180
7,8 = .560
yes all usb c where doing the same, I started removing capacitors on the line PPVBAT_G3H_CHGR_R and now it hasn´t turned on it is only getting .025 A and down to 0 A again...
Did you remove the caps with hot air?
The heat applied affected something else.
You should not touch that area...
You should not touch that area...
You've said board started before, after few seconds...
Still not sure what happens with R7020 voltage at that moment...
Do you get at least 5V at R7020 in that moment???
Did you try SMC bypass mode?
So many times explained on the forum.
Google also can direct you to an official Apple instructions for sure...
Google also can direct you to an official Apple instructions for sure...