Good Morning. (Where I am anyway.) Have Macbook Air 1398 with 820-00138-A with liquid damage. Does anyone have schematic and boardview for this board. Thanks in advance for any help.
820-00138-a A1398
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Re: 820-00138-a A1398
I've got a schematic, no boardview though.Attached Files -
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Re: 820-00138-a A1398
I'm working on a 820-00138-A board that was liquid damaged.
It's booting but goes into panic-mode (loud fans) and the cpu and ram is getting very hot.
I have 19,6V on PPBUS_G3H, this is too much, it should be 12v.
Does anyone has any idea what I can do next?
Thank youComment
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Re: 820-00138-a A1398
Shorted high side MOSFET for the PPBUS_G3H buck converter, so you get the DC in voltage on PPBUS_G3H.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: 820-00138-a A1398
Thanks but the board view you provide is a bit different than 820-00138-A board I have and the tracks doesn't match, in special ti the SSD control IC's side. Does anyone has the correct brd for this board please. Thanks in advance.Comment
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Re: 820-00138-a A1398
have a problem with the trackpad not responding. try w another but nothing. guess is a problem w the logic board. any suggestions or someone with the right pdf and openview files..Comment
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Re: 820-00138-a A1398
Schematics in this thread is the correct one. The touchpad connector J4801 in the schematics is wrong though, use 820-00163 schematics for the proper pinout.
The boardview in this thread is for 820-3662, it looks similar to 820-00138 but the SPI ROM and touchpad area are different. Use 820-00163 again to troubleshoot touchpad area.
The correct 820-00138 boardview may be available, but I haven't seen it yet. Most websites sell the 820-3662 but labelled 820-00138, be aware of this scam… (same for 820-3536 sold as 820-3476, 820-00163 sold as 820-00426 and maybe some others)OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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by bloodhoundHi!
I´ve got an Acer C27-1655 AiO computer for repair on my bench.
Mainboard: AX1T_MAIN_PCB
The liquid was mainly in the area of MQ1, the voltage regulator for +VDDQ_MEM (pictures attached).
Symptoms:
When power is connected and power switch is pressed, I get 5V at L1, 3.3V at L2 and 1.8V at LPM5. I also get V1.05A_BYPASS at R442 for PCH.
I also measure 2V on +V1.8U_2.5U_MEM but +VDDQ_VTT and +VDDQ_MEM stay at 0V. +V1.8U_2.5U_MEM is also drawn to 0V if RAM memory is installed.
LPM1, LPM2 and LPM3 stay at 0V.
+VDDQ_MEM... - Loading...
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