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Sorry for wrong info , right one is PM_SLP_S4_L =3.3 v U8010 is not shorted IN-OUT.

This board was water damaged without battery green light after 2 seconds become orange light and not turn. Found the following measurement PPBUS_G3H @ C7900 : 12.56v=12.56v PP3V42_G3H @ C4850 : 3.42v=3.42v PPVRTC_G3H @ C1910 : 3.33v=3.3v PP5V_S5 @ C7505 : 5.05V=5.1 PP5V_S4 5.1v PP5V_S3 5.1v...

Chance bios and now it works, dont know why.

After 3 days there is no display, turn on,hear chime sound , see the screen light on but no display. Any help please?

Re flow CPU /PCH , now fan is spinning and boots normal. FIX!! Thanks.

When machine boots, VCORE drop to 1 V and machine fan stop it drop 0V. Doesn't spin the fan in SMC bypass, at all.

Get VCORE 1.1v. R7402 is OK. NO, not turn on in SMC bypass mode (with RAM) Try new BIOS, no luck. Check all resistors connected to SPI chip -OK Check each RAM slot one by one, with known good RAM module- no luck.

Get VCORE 1.1v. R7402 is OK. NO, not turn on in SMC bypass mode (with RAM) Try new BIOS, no luck. Check all resistors connected to SPI chip -OK Check each RAM slot one by one, with known good RAM module- no luck.

This unit shows green light , fan spinning and off , cycle. Looks like no liquid damage. Green Light - OK PPBUS_G3H - 12.58v PP3V42_G3H - OK PP5V_S5 - 5v ok PP5V_S0 - 5v and drop for 0v (turn on and off fan) Y2805=1v Removing memory turn on fan continue running and no memory beeps sound.

No, this is happens with another same MB bios.

Try to load USB osx ( Siera) and it stuck on logo at end of the Bar during upload osx ,disconnect KB.

I used original working board bios chip and boot from high siera and it works for couple of hour but now again this is not boot up , shows stop sign. This is terrible and i am surprised.

Hi, it works with my backup. I tried another same model bios but no luck. Do you think try one more other bios?

No luck even no display.

Unable to unzip the file, it says file is damaged. Could you please try again.Thanks.

https://drive.google.com/drive/folders/1MYXVcOxZpmPuBxNvIAjxpi35urV0feWv

I sent a google link to your private message, please check it ,Thanks.

I uploaded original one and now it boot from usb osx but when tried to boot from original HD it shows stop sign. I did reformat/partition it with other mac and tried to load os from online but it shows stop sigh again.Any idea what should i do.

no boot usb osx, same thing happen.

I am trying to use the same HD but not boot up. I reinstall os on other good unit and back it to original unit but it is not boot up. Its hang after awhile. I tried different good SSD same issue.Any idea ??