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One more finding, Not sure which trace is this which is with corrosion and broken, Traces below L7195 https://drive.google.com/drive/folders/1LAIOQ_KmtSd16uVYzcPhsclQXO5HrGxe?usp=sharing

Also R7120 - I have checked continuity between 2nd pins of R7121 and 22 , It is 7Mohm

Both these resisters are open (R7121/22 ) , Shall I change them ?

F7140 diode mode - 0.442V U7100 1 - 0V 2 - 16.49V 3 - 3.92V 9 - 4.316V 12 - 3.417V 13 - 3.38V 14 - 3.1V 15 - 0.051V 17 - 1.659V 19 - 5.524V 20 - 5.503V 27 - 16.09V Resistance btw 17 & 18 is 3.2 Ohm Resistance btw 27 & 28 is 483K Ohm

I am trying to track the voltages, Unfortunately, I couldn't find the right board view file, There are many on the internet, But those are not matching with my Board, I don't know why. Could someone help me? However, here is the voltages on different inductors (I hope the refdes should not be...

Even this bios didn’t help, Not going to loop,,, and not booting… Some times I can see backlight

Is there any chance someone can help me with other working bios?

Good News z, Tried a new image attaching below ,,,, It is worked , Now its booting https://drive.google.com/drive/folders/17KaFREF1_vUgw48aVWb7qydaPNTelYeB?usp=sharing

Additional info---> , After new bios , CPUCORE_SW1/SW2 are 0V, Also PLT_RST_L is low (0V)

Tried new bios which you have given, It didn't made any change

Yes, I have flashed the full bios, With full bios flashing I don't see Scenario1 anymore...

I can hear HDD running sound, sometimes the first LED is flashing, Maybe it's trying to boot... But not happening. I have just seen an apple logo for a moment. But not the boot loading bar.

Let me explain what I have tried , Connected a type C to Usb 3 adapter from Usb 3 connected another USB 3 to SATA converter, then an HHD with Macintosh HD image. I could see one LED out of two is glowing. https://drive.google.com/drive/folders/1-YwY_Hc1qlF4fXoRUzoCUaQEaf1sXhkR

The core voltage is 0.903V after 10 sec. Could you help me with a known working bios?

I am not sure, I have a medusa 3, But i don't have a chipmunk USB tester, Is there something I can try with medusa 3?

I have connected back to the enclosure, Measured PLT_RST_L, It is still going high (3.3V). what does it mean?

Hi, After updating with a clean working image Scenario1 is not occurring at all, I mean not chiming or not going to loop. I think it's directly going to Scenario 2. Should I put back the old bios image or I should check something else with this bios image? Scenario1- it goes to loop with a...

L7211/31 was 1V when it was connected with the display. When I test board alone L7211/31 are 0V

When I test board separately , L7211/21/31 all these voltages stays 0V. Same time PLT_RST_L stays HIGH (3.3V). CPU is heating UP (Heat is keep increasing)

I could find the schematic and board file, Sharing it in the same google drive above. The corrosion is around U3900 (DDR4) , and U3100.