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Yes. As I mentioned tried multiple boards and flex already. Yes also using ms2 charger 85w

I've tried multiple other IO boards and cables. Board will stay running if IO cable is plugged in after it starts. CHecked VSENSE and ISENSE readings related to the SMC. ISL has been swapped. No change in Adapter Sense, SMC LID, FINSTACKSNS_ALERT_L, SMC_BC_ACOK or the SDA/SCL lines with cable...

I was able to resolve this by planting a pre-loaded SSD, doing PRAM, SMC resets and selecting the SSD as target disk. Reloaded successfully and no errors in AHT anymore.

Originally this board would not start had blown caps and bad U7000 corrosion around that area had to jumper pin 6 of U7000. This board seems to work right BUT shows VDH002 in AHT. The Mac runs mostly normal but has strange pauses like when loading boot option screen there seems to be a long...

DAH it was related to the a missing trace from Y5010 to R5010 AND a bad DCIN board. Now I'm getting 12.65V on PPBUS_G3H and fan spin. Thanks Guys!

I do not get SMC_PM_G2_EN. It is 0V. SO you're right I don't get 3v3_S5. I actually thought I had checked that before but Piernov asked for 3v3_S5_SMC specifically. Doesn't appear to be a short there. I traded out the U7941 just in case. So if not the SMC then must be the trace from SMC to U7941?

This mac gets about half way through boot up and seems to get stuck. Never finishes boot up. I resoldered U8900 and then replaced it. Checked components around it. All seems like it should be good there. I can't get ASD to run nor will it boot up in AHT. It will boot into windows from external...

Yes, used from 3115 donors. No MagSafe light and no boost of PPBUS_G3H.

Any chance this could be firmware related?

R7000 is good. Voltage at SDA/SCL charger only is 3.49V. I tried swapping U7000 just in case being I already tried the SMC at least 3 times with no change in results.

When I checked them they were .003 apart. .504 vs .507 diode red to ground

Scl/sda lines are 3 mV difference. Board is out of the Mac so no BIL connected. I’ll swap the U7000 and check continuity between it and SMC where relevant.

PP3V42_G3H is 3.49V PP3V3_S5_SMC_VDDA is 3.49V SMC_RESET_L is 3.45V

USing 85W charger, getting only 12.3V on PPBUS_G3H. NO light on charger adapter. Replaced DCIN adapter with many different. SYS_ONewire is low usually at .7V sometimes at 1.3V (diode check red to ground there is .6V). I checked trace from U6900 to SMC and .9 ohms resistance. I've swapped the SMC...

I was finally able to get a 820-00281 donor board to try the U2890 TBT flash. I've attached that here

Assuming I would end up disabling the GPU anyway, I just went ahead and removed it and sure enough... USB data activity, so looks like I'll be able to get this board back in action. Thanks!!!

No change with BIOS.

Dah... just double checked PLT_RESET_L and its there. Still no USB activity on either port, no chime, no blips of life detected with external display. I'm going to try BIOS. Let me know if you have any other thoughts.

CPU_PWRGD - 1V PM_MEM_PWRGD_R - 1.5V

Board starts but no USB activity. PM_PCH_PWROK= 3.4V PM_PCH_SYS_PWOK=3.4V PLT_RESET_L =0V diode to ground there is .4V Assuming ths board also has GPU issue... but GPU VCORE = 1.15V and .05V diode to ground OR 4ohms (I assume low voltage drop is normal being the voltage looks right?)