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Seems the keyboard is interfering. If I disconnect the keyboard, it turns on fine and stays on. Power button held on maybe. Anyone know what to short to trigger the equivalent of pressing the power button? I don't have a spare keyboard for this model.

Damn it.. I get noise to say the charger is plugged in and an apple logo for 1 second :mad:

I started testing all caps and resistors on the PBUS side between U7000 and F7000, found R7062 (which should be a 1ohm 0201 resistor reading as 147ohms so U7000 probably thought there was a ton of drain with that at 147ohm. Swapped R7062 out and now I have a solid 12.95v on PPBUS_G3H up to...

If you mean 3v3_g3h on pin 30, that is stable at 3.396v SMC_Reset_L is also stable at 3.396v I can't see anything wrong around U7000 R7020 is a stable 20.2v on both sides

LX1 Pin 31 is fluctuating between 0v and 36mv LX2 Pin 6 is also doing the same Thats only with a multimeter though so it may be jumping higher but its too quick to catch

VDDA Pin 2 - 5.02v VDDP Pin 17 - 5.02v PPDCIN Pin 10 - 20.2v TBA_CSIR_N Pin 15 - 20.2v TBA_CSIR_P Pin 20 - 20.2v TBA_AUX_DET Pin 18 - 5.01v SMC_AUX_OK Pin 28 - 3.396v

New one on and back to 20.2v but still have PPBUS_G3H fluctuating on pin 1 of F7000

The other one was giving a happy dance while reflowing so it should have been okay solder wise.. I probably poked something I shouldn't while testing I imagine

Tried that but no change. Just trying the second one now

While testing the voltages, U7000 stopped working again. I got 20.2v on pin 10,15,20 before it stopped. I ordered two U7000, so I guess I'll be changing it again

I'll check the voltages into U7000 then.. problem is, I'm not 100% sure what they are meant to be for some

Ive taken F7000 off the board to see if PPBUS_G3H fluctuates on the pin one side of the fuse when its not continuing on to the system. Its still fluctuating but not as much (or my meter can't see it) it looks like its going from 7v to 12.95v repeatedly

ALL_SYS_PWRGD is jumping from 0v to 3.2v continuously also

20.3v dcin now though :)

Replaced U7000. Getting 5v on VDDA & VDDP now. Still have an issue with PPBUS_G3H as it?s jumping between 3.6v and 12.95 continuously. I can?t get it to start in SMC bypass either, I just get a fast fan for 2 seconds and it goes off again

Now to find a UK supplier of the chip :p

What should VDDA and VDDP be showing as? I'm assuming SMC_AUX_OK should be outputting something also but it looks like that needs 3v3 too

Okay.. I'll give that a go.

Thank you 2informaticos.. Pin 10 - P_IN = 5.16v Pin 18 - AUX_DET = 1.28v Pin 2 - VDDA = 1.39v Pin 17 - VDDP = 1.39v Pin 28 - SMC_AUX_OK = 0.0v

Pin 27 on U7000 is a direct connection to Pin 2 of R6991 from what I can tell. As I'm not getting anything on R6991 I wanted to look at U7000 to see if it is even getting the voltages it needs, but I'm not good enough at understanding the schematic just yet. Could someone better than me let me...