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Whenever I try to measure CPU_VR_READY the computer shuts off. This happens anywhere that I try to read that signal on the board... just putting my probe on the pad causes the computer to power down. I replaced U7200 to see if it was the problem, but nothing changed. LPC_PWRDWN_L is not...

That's what I was thinking... After replacing the PCH/CPU does the bios need to be updated? Or should it just work automatically with the new chip?

VCCST_PWRGD is present

I got my CH341a programmer up and running. I just uploaded a new bios with clean ME region and the computer still will not boot. The computer has exactly the same symptoms as before... fan spins, stops and then just keeps spinning. No boot. PLT_RESET_L is still missing. At the top of pg. 13 of...

Thank you Piernov that was helpful. I need to put a new bios onto a 2015 820-00165 board using the process you outlined above. On the forum I was able to find a 2017 820-00165 bios with a clean ME. Are they compatible? I was unable to find the file for a 2015. Thanks

I did some research... does this seem correct? 1) Start with a good BIOS with clean ME region for your motherboard (in my case 820-3115) 2) In HxD, calculate the checksum (Apple uses SHA-1 format) prior to making any changes. Record this number. 3) Change the serial number to the correct value...

I have a few computers that I suspect have a corrupted bios (they don't boot) so I do need to build a new one. I can correct the serial number myself using HxD. How do I fix the checksum of the Fsys area?

I take it back... for some reason the search function didn't work initially. I tried it again and found the serial number hidden among all of the gibberish. Can I get clean bios files for 820-3115 and 820-00165? Also, I know that you can't take a bios chip from one motherboard and transfer it...

I extracted the file (PE32 Image Section) and opened it with HxD. I attached a screenshot. For the most part, the decoded text is just nonsense. I feel like I'm doing something wrong though because when I open up a known working bios file in HxD the decoded version is also not intelligible.

I downloaded UEFITool NE and searched for SSN. It specified the following destination: EfiCrc32GuidedSectionExtractionGuid/PE32 image section at header-offset 314Ch. After navigating there, the contents did not show anything related to the serial number. I attached a screenshot. What am I doing...

I extracted the bios from an 820-3115 MBP using a CH341a programmer. Is there a program that can get this into a readable format so I can see basic information about the computer (ex. serial number)? Thanks

I am on my third SMC replacement and can't get green light back (I had green light prior to replacing SMC). I don't know if I just have a bunch of salvage boards with bad SMCs or if I caused a new problem during the replacement. The following signals are present: PP3V42_G3H PPBUS_G3H reads a...

It was corrosion on the battery light indicator. Board was fine. Thanks!

This machine was water damaged. ISL 6259 was replaced and battery current sensing was repaired. Overall, damage was minimal. It now passes ASD EFI without issue and runs well. Only hardware that has been changed is HDD has been replaced by non-Apple SSD. Sometimes, when the machine is allowed...

Thanks for the schematics. I spent a while digging through Google search pages but all of the links I found were either broken or had no seeders. The closest I got was this: https://www.loremipsum.info/2019/03/apple-service-diagnostics-mac-test-pro/ I was able to download the files, but...

Would anybody on the forum be willing to seed and send me the link to the following ASD files? 3S 144 3S 148 3S 150 3S 152 3S 155 3S 156 Also, I need schematics and board views for the 820-00164 and 820-00165 boards. Much appreciated!

SMBUS_SMC_1_S0_SCL and SMBUS_SMC_1_S0_SDA both are at 3.3V. R5260 and R5261 both read 4kOhms. Both signal lines are showing about 0,54V to ground. Everything seems ok here. When I ran MRI the temp readings on Fin Stack, CPU Proximity and Memory Proximity were all normal (between 26-32C)...

PPBUS_G3H, 3V42_G3H and SMC_RESET_L were all present when it wouldn't turn on. I got the computer running and ran MRI. CPU Core PECI (temp sensor) failed test. It read -127. This sensor works on a data line that goes between the SMC, CPU and PCH. It is associated with Q5050. I replaced Q5050 and...

"I need both of these signals to get PM_PCH_PWRGD." It turns out you are right. I will explain how I know in a moment. However, please take a look at pg. 3 on the schematic. Step 27. There is an AND gate with CPUIMVP_PGOOD on one side and CPUIMVP_AXG_PGOOD plus some other PGOOD signals on the...

All S0 signals are present except for PPVCORE_S0_AXG_REG. PPVCORE_S0_CPU_REG is present, but low (~1.1V). Even though PPVCORE_S0_CPU_REG is present, U7400 is not giving me CPUIMVP_PGOOD. It is also not outputting CPUIMVP_AXG_PGOOD (obviously, since PPVCORE_S0_AXG_REG is missing). I need both...