felix27
Member
Last Activity: 05-01-2025, 12:09 PM
Joined: 05-01-2023
Location: Vienna
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I looked at the schematic again and PM_PCH_PWROK isn'r even generated by the PCH. All Voltages that depend on U7100 are gone, even PPVCCSA. Could just U7100 be dead? -
Thing is, I don't even get vcore and all resistances seem normal. My CPU stays completly cold and CPU VRM isn't even turning on. The PCH doesn't create PM_PCH_PWROK but there is SPI activity on the ROM IC, so the PCH isn't completly dead either.Leave a comment:
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PPBUS G3H is 8.8V
U3900 gets warm (not extremly hot). Is that normal?
Could my EFI-Firmware be the Problem?Leave a comment:
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PPVCCIO_S0 is only 0.84V and PM_PCH_PWROK is not present....Leave a comment:
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I do not have an USB ampmeter, but imput voltage is steady at 20v measured at C3101...Leave a comment:
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ALL_SYS_PWRGD is also present, so i guess, either U7800 or U7100 have some sort of problem. But resistance on the ALL_SYS_PWRGD line is normal, it is not shorted to gnd....Leave a comment:
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MACBOOK A1534 820-00244 Logicboard Dead
Hello,
I want to fix a 2016 12 Inch Macbook which has a dead Logic Board.
USB-C and Battery section seems to work, trackpad clicks, but all cpu Voltages, (VCORE, CPUSA) are 0V, CPU stays cold.
PPBUS_G3H, 3.3V and 5V Rails seem normal. PM_SLP_S3_L is present but CPU_VR_READY is not.
Thanks for your help! -
ideapad c340-15IWL random Blackscreen
Hello,
I am trying to fix a ideapad c340-15IWL with random blackscreen crashes, after witch the system is completly unresponsive, even on an external monitor. The blackscreens accur completly random no matter the load put on the system. You can sometimes run cinebench succesfully only to have the system blackscreen five minutes later while doing nothing. I have already tried to resolder several chips and have resoldered all contacts of the dimm slot. I have also tried different ram, wifi-card and SSDs, with the same effect. I had another lenovo with a similar issue, which was resolved after... -
Thank you, yes that is exactly how the system behaves.Leave a comment:
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Ok thank you, but wouldn't the system still Boot without an igpu over HDMI(HDMI is connected to the dgpu)? That way it would at least still bei usable as a Desktop.Leave a comment:
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Nitro AN515-55 not booting
Hi,
i am currently trying to fix an ACER Nitro AN515-55. Originally the 19V was shorted by the VCCGT Powerstage. After removing it the short was gone. I tried replacing the mosfet and also booting the system without it and a Monitor connected to HDMI. In both cases the system lights up, cpu, gpu and pch get warm but there is nothing on the screen. Is it possible that the short took out the igpu and the cpu at the same time or is the system just unable to boot without an functioning igpu. The system also didn't boot with a functioning mosfet for the igpu rail. Resistance on VCCGT is 4 ohm,...
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