What is the exact voltage to ground of PPBUS_AON @ white fuse F5200?
-
-
Pin 1, 12.2V unstable.
Pin 2, 12.2V unstable.
F5200 = 0.2ohms
Diode Pin 1 = 0.487
Diode Pin 2 = 0.490Comment
-
Can you define unstable? How bad are the fluctuations?
Suggest to flux and remove the white fuse @ F5200. Then measure the voltage to ground again at F5200, pin #1. Is it stable? What is the voltage?
What is the voltage of 3V8_AON (measure @ C5895)?
reference:
https://boards.rossmanngroup.com/thr...0-02016.65022/Comment
-
Okay.
I'll do that tomorrow morning.
In the meantime, thank you very much for your help.Comment
-
F5200 retired
Pin 1 = 12.26V - Diode 0.520
Pin 2 = 0.215V - Diode 0.480
C5995 (PP3V8_AON_VDDMAIN)
Diode 0.340
Volt 3.8Comment
-
Remove all power.
What is the resistance to ground of pin #2 on the pcb pad for the removed fuse F5200?Comment
-
Sorry for the delay in replying.
Pin 2, fuse removed, in ohms, 0
Diode, 485Comment
-
Remove all power. Meter in resistance mode. One meter probe on pin #2 on the PCB; other meter probe to ground. What is the resistance in ohms? Is it 0 ohms?
For diode mode of testing; meter in diode mode. Remove all power. Red meter probe (yes red) to ground. Black meter probe onto the pin to test = pin #2 of the removed fuse PCB pad. What is the measurement? If close to 0 then we indeed have a shorted downstream power rail.Comment
-
No power supply connected.
Fluke in Ohm mode, PIN 2 reading, black to ground, 12 ohms.
Diode mode, same PIN, red to ground, 500.
As a reminder, if it's helpful, the source of the oxidation is the sound card.
PP3V8_AON_VDDMAIN on CF110:
Diode 345
Volt 0.2
PPBUS_AON on F5200 removed:
Diode on PIN 1 440 - PIN 2 500
Volt 12V on PIN 1Comment
-
These 2 measurements contradict the other. 12 ohms is indeed very low but the diode mode reading shows that it is OK.Fluke in Ohm mode, PIN 2 reading, black to ground, 12 ohms.
Diode mode, same PIN, red to ground, 500.
Leave the meter in DIODE mode. Touch the meter probes together. Meter should tone beep. Now repeat the diode mode measurement on pin #2 on the pcb. Black probe on pin #2 fuse pad. Red probe to ground.
Is there a tone beep?Comment
-
I confirm the 500 in diode mode.
Strange...
I hope I'm not taking up too much of your time...Comment
-
Power up without the fuse. What voltage to ground do you measure on pin #1 of the pcb pad where the fuse was removed? Meter in DC volts mode (20v or higher is ok).
Is this voltage stable? Post the measurement.Comment
-
12.26V
Pin 1, F5200 outComment
-
-
-
Thank you very muchComment
-
I would like to add my to the discussion.
I also have a MacBook Air A2337 with the same problem as hopkok .
The device had fluid damage in the UF400 and UF500 area and oxidation in that area. I have cleaned it.
When I connect a power adapter, the USB-C tester shows 0.18A/5V for 6 seconds. Then only 0.006A/5V and it stays like that, no cycling. I measured 11.3V on the C5960. I suspect that the two UF400/UF500 are defective. I have read that the two UF400/UF500 can only be taken from a donor device. The ones you order from China are not supposed to work. I ordered the CD3217B12 some time ago as a test. This chip looks exactly like the original one on the board. Same font and also the dot. Is there any firmware on this chip, or why can't these chips simply be replaced?
I have measured:
UF260 Pin1= 3V3
U1970 Pin1 (measured at test point TPG464)= 0V
U1974 Pin1= 0V
Does anyone have any ideas where I should start?
THX
Comment
-
Hi. I am pretty sure I have posted a power up sequence chart for this model. If not or unable to find, can post it again.
This is OK since pin #1 = CS# = active low signal. When the voltage is 0v, the chip is being selected to operate.U1970 Pin1 (measured at test point TPG464)= 0V
Not good. Remove all power. Meter in resistance mode. Measure the resistance to ground of pin #1 = PP1V25_AWAKE_IO. Share the resistance measurement in ohms.U1974 Pin1= 0V
What is the voltage to ground of PPBUS_AON? Is it stable?
Comment
-
#1 = PP1V25_AWAKE_IO = 18,5 kohm
PPBUS_AON @ white fuse F5200 = 11,92V it is stableComment
-
Measure the voltage to ground on each side of R1583.
What is the voltage to ground of PPDCIN_AONSW? This should be @ 20v.Comment
-
Hey! As the title says. i don't know if this is the right place to ask but i need to get trusted USB C Controllers (CD3217-CD3215) For macs and dont know where to get them. i dont know if you guys know where is a good place to get it.
The thing is that i have a Macbook air A2337 M1 and i dont have a donnor board to get the CD3217. So i try the CD3217 from a A2141 Board and at first, whitout his eprom it does not convert 5v to 20v. then i put the original CD3217 eprom from the A2141 and then the macbook A2337 conver the 5v to 20v but still not turning on. i guess that the CD3217 is...09-06-2024, 12:06 PM -
Hello all,
I am repairing a Macbook A2337 and i have a problem
The Macbook is stuck in restore as someone before me tried a DFU restore and bricked the device, now i can't do a restore as AC2 throws error 1 which is related to the trackpad.
When i turn on the device i get the trackpad click for a few moments and then nothing, i tried 7 trackpads and 7 trackpad flats, i know all 7 are functioning okay, especially one as i use it for testing and DFU restore.
I inspected the whole board and everything seems fine.
Can anyone help me as i didn't fiddle with trackpad... -
Hey,
I'm working on a MacBook Air M1. I'm pretty sure the U8100 is not working correctly. But I never had to change it before, so I wanna ask anyone of you guys to confirm (or not confirm) my thoughts on it.
USB Tester: 5V / 0,00A
PPBUS_AON: 12,3 V
PP5v_S2: 0 V no short
PP3v3_S2_UPC: 0 V no short
PP1v25_S2: 0 V no short
PPDCIN_AON_CHGR_R: 5 V
no enable signals for the S2 rails by the U8100
both CR3217 (UF400, UF500), are supplied by 5V (Fuses FF200 and FF201)
PP3v3_UPC0_LDO: 0 V, 0,5V diode mode to gnd
PP1v5_UPC0_LDO_CORE:... -
Hello, a friend give me this M1 Mac Air, he said that it simply stop working. Apple preventive is replacing motherboard.
Model is MacBook Air M1 A2337, logic 820-02016, not booting, and taking 5V 0.42A and consuming 2.173W.
Once disassembled is very clean, no water damage at all. Visual ispection reveal no visible problem. Flir camera point to two hot point:
C81DC PP3V8_AON_VDDMAIN
And
Q5800
What should I test as next step?
Thank you very much! -
Hello! I need help, the MacBook could not boot and rebooted! After examination, I found that the small sound board with a 3.5 mm jack was oxidized! I replaced it and the MacBook no longer boots. Consumption with a battery 20v / 0.000A, without a battery 5v / 0.120-0.470A (not stable). The MacBook is not in DFU!
Comment