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Hi, I have above board , original issue was loading osx half way shutdown. some times not turning at all. but now no chime no video but all the power rails are present including ppvcore. also all_sys_pwrgd is 3.3v pm_pch_pwrk is 3.3v So greatful if you can give any any clue. Thank you...

Hi Smiba, I got 820-3437 board same issue. I got the cpuvcore,no fan spining coz no PM_PCH_SYS_PWROK as SMC_DELAYED_PWRGD is missing. I replaced the SMC still the same. Did you solve this? or any idea? THank you.

Hi Duke, Thank you for your quick reply. You are spot on right. What I did was clean under the J6100 and put back. Yes the looping chime was just a Echo. thank you so much for your support. This is solved.

forgot to tell I tried to boot with bootable usb and safemode nothing works.

Hi, This is a liquid damaged board. it was badly damaged in u7090 area. How ever I fixed it and now it has pp3v42 3.4 and diod mode 0.291. now the issue is some times it works fine then again stuck in apple logo at the very start. SMC reset works fine but after pram reset chime repeats. board is...

Hi Duke, Just to let you know that this was solved after reballing SMC. Thank you so much for your support.

Hi Duke, Any Suggestions?

Hi John. I know. I just did that.

Hi Duke, Thank you for your replay. u1950 seems prety clean and but replaced it and no different. All the pins getting accurate voltage. PCH_SYS_PWROK 3.3v on R1962 . I thought maybe the bios and replced it still the same. any clue? ​​​​​​​

Hi All, This is liquid damaged board. insted of 3 times spinning at the start it spins about 10 sec then stop and spins again for the second time and no chime. after 80c ultrasonic cleaning only one time worked well and again back to same situation. connect usb mouse no light but CPU_vcore...

Hi all, Thiis is liquid damaged board damaged SMC area. Earlier Green light no power. After replacing R5173/R5192/R1802/C5013/C5011 , power up booting normally. only issue is when u shutdown cant start with the power buttun. Or if you try to power off before booting pressing the power buttun it...

HI LOUIS, JUst to update you after replacing SMC the macbook works fine. Thank you verymuch for your guidance. I have an small issue I bought a SMC stencil and solder paste from you. I think I'm doing something wrong way as stencil stick to the SMC and it was a nightmare to reball the SMC. I...

Thank you very muh louis. I will do that and update you.

Hi Louis, Thank you verymuch for getting back to me. U6900/U6901 all the power rails are present and accurate as you described. PP5V_S5 is 0V. SMC_PM_G2_EN is 0V. PLEASE ADVICE ME. Thanks Louis.

Hi there, this is liquid damaged board. So far this is what I diagnosed. PPBUS_G3H. -8.4V PP3V4S_G3H -3.4V SMC_ONOFF_L -3.4V SMC_BC_ACOK -3.4V SMC_RESET_L -3.4V SMC_ADAPTER_EN -0V PP5V_S5 - 0V THERE IS NO SHORT IN PPBUS_G3H AND PP3V42 IN DIOD MODE. SMC not heating at all even if you plug for...

Hi Duke. SMC Replaced. and thanks to you it is working again smoothly . Thanks lot for your guidance Duke.

Smc you recon I should replace the smc and check?

yes I can turn it on back shorting R5115 or 16

Hi Duke, Yes it is boots after 12 sec fan spinging I get the chime and apple logo. then auto turn off . now nothing connected other tha dc jack as soon connect the magsafe fan spins then after 20 sec auto turn off

Hi Duke, Thanks for the quick reply.nothing connected other than DC in board. SMC_ONOFF stable 3.4v even after fan stoped.