the board is not filled! 3 ports consume 5v/0.265a and overload! one port 20v/0.120a and reboot and so constantly overload! no short circuits! replacing the U7000 did not help! replacing the BIOS also did not change anything! tell me what else can be checked! so far my suspicions are on the U1100
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PPBUS_G3H=1.7V
PP1V1_UPC =0 all cd3215Last edited by PITERPENY; 11-09-2024, 06:35 PM. -
Remove all power. Flux and remove the fuse on PPBUS_G3H. Meter in resistance mode. Measure the resistance to ground of the 2 pcb pads where the removed fuse was soldered. Post the measurements.Comment
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Of course the USB-C controller for the port that acts differently is gonna be bad.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Measure the resistance to ground of each of the USB port's VBUS line. Perhaps a local USB load switch is defective.Comment
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I have PPBUS_G3H=1.7 V and it should be 13 V! Who forms this voltage? VBUS = 5 V (d0.122) 0.700 kOhmComment
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U7000 = ISL9239 is the buck / boost regulator that creates PPBUS_G3H.
If the input voltage is 5v on VBUS, then this regulator will enter BOOST mode to booth the output to a required voltage. Whenever the voltage is boosted, the current support is for low loads.
After the PD controllers negotiate 20v from the power adapter then the VBUS = 20v and this U7000 regulator will enter buck mode to lower the 20v down to the required voltage.
If the PPBUS_G3H voltage is low, inspect this area and without power to the board, confirm the resistance of the dual mosfets @ Q7030 and also Q7040.
Measure the full resistance path of the VBUS input resistors by probing across C7023. Does this resistance match the schematic values? Should be ~2 ohms.Comment
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I put the board in another case with a charged battery and all 4 USB ports show 20V/0.250A (stable). But it doesn't charge and the fans work at high speed despite the touchpad being connected! The system doesn't boot! C7023=2.7ohmComment
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Try a DFU. Double-check your interconnect cables from the trackpad assembly.
Is the trackpad & trackpad cable a known good pair?Comment
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dfu A1707 is not supported! The case with a fully working MacBook and another board works fully in this case! The problem is on the board! It does not see the battery apparently and therefore does not charge! The problem is in the power supply network, but I do not understand where! Maybe the problem is in the Thunderbolt firmware?
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Hi guys I have a Macbook a1707 with motherboard 820-00281, without liquid damage that behaves strangely, with the battery connected the Macbook does not turn on and the USBC meter stops at 5v in loop, when I disconnect the battery the Macbook turns on and works fine, I have already tried to replace the battery twice without success, as soon as I connect the black cable of the battery the Macbook does not turn on, it stops at 5v and in loop. -
Hello there
I have problem with Macbook Pro 15" 2017, model 2017, MB code 820-00928.
I bought it as broken with some artefacts on the screen, first I thought that this is problem with ribbon cable but after inspectiing ribbon cable I know it is fine. I tried to reinstall macOs and then I figured out that this must be something with GPU as installation freezes at the end (when drivers are loaded). I installed Windows and was able to install every each of drivers except GPU driver, as soon as I tried to install GPU driver - black screen and restart.
...11-21-2024, 05:25 AM -
Hi,
I'm having an issue with an A1707 MacBook Pro—there's no audio output. Initially, the MacBook came in with a no-power problem, and I found a faulty U6400, which I've now replaced. The laptop now powers on, but there's still no sound.
I've also replaced U6300, but the problem persists.
Here are the current voltage readings:- PPV18_S0: 1.8V
- R6402: 1V
- R6405: 1V
- R6403: 1V
- AUD_SPKRAMP_RESET_L: 1.3V
- PPBUS: 12.6V
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Hello everyone,
I'm currently diagnosing a MacBook Pro A1707 motherboard that does not power on. I've gathered some data but am stuck and need expert advice.
Note that i'm a beginner in electronics and i'm trying to learn while trying to repair this macbook that my work gave me. I'm really curious and love understanding how thing works and i already learned so much.
Only one usb c port is taking 20v and have 12.5v on PPBUS_G3H. when trying other ports, 2 are not going to 20v and one is going to 20v but the CD3215 is getting really hot.
Observations... -
Hello,
Namaste!
We have a Macbook A1707 which came in for repair. Someone had already tried to work on it and there were traces oh heat and burns on the board.
The charger was Stuck at 5v and the there was some caps shorted around U3100.
Turns out there was corrosion under U3100. Same was Reflowed and the Macbook turned on. Works fine but having 1 issue whenever the Macbook is idle and goes into sleep mode. It will WAKE for 1 Second and then do a restart.
It will Display a Black Screen with error message saying Macbook Restarted because of a problem....
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