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unfortunately the board did stop working when I tested it again. It kind of tries to boot and spins the fan then stops then tries again. In SMC bypass mode it sometimes gets to a full boot and I hear the chime, but then it dies again. I have never gotten it to show anything on the display either...

I verified every voltage and resistance, and also checked that resistance to ground on the PBUS and DCIN lines were the same as working board. Is it possible that this is just bad SMC or bad connections below SMC? All the other components are fine. EDIT: reflowed SMC- board now boots and draws...

PBUS_VSENSE and DCIN lines had same resistance to ground as good board still 1.46v and 2.11v on the two lines even with capacitors removed r5489, 5488, and r5499/98 all are correct values on broken board

resistors had no sign of damage below I am posting first broken board voltage in SMC bypass mode, versus working board voltage for comparison Q5480 PBUSVSENS_EN_L- 0v(broken) vs 0v(working) PBUSVSENS_EN_L_DIV- 6.09v vs 6.25v PPBUS_G3H- 12.26v vs 12.55v PM_SLP_S3_R_L- 3.3v vs 3.3v...

regular mode, plugged in SMC bypass mode Working Board CPU_ISENSE 0v 0v 0.10v DCIN_ISENSE 0.04v 0.04v 0.33v HDD_ISENSE 0v 0.01v 0v BMON_ISENSE 0v 0v 0.06v CPU_HI_ISENSE 0.07v 0.01v 0.12v OTHER_HI_ISENSE 0.08v 0.02v 0.09v MEM_ISENSE 0v 0v 2.64v CPUVCCIO_ISENSE 0v 0v 0v...

The board now turns on consistently after I pushed down a little on R1802, probably some damage to the PCH_SRTCRST_L line in that area. the voltage on that line is still 3.3v. SO I guess it's working...

like I said in my final edit PCH_SRTCRST_L was 3.3v and I did end up replacing C1802, but I will check the trace, could I be getting 3.3v if it wasn't connected to PCH?

I did replace it and it does the same thing. SMC is beyond my skill at the moment so I am going to just use this board as a desktop mac/always plugged in. but thank you for the help.

C6703 WAS LOOSE- and had ripped a pad BOARD BOOTS after replacing it! thank you so much for the help! this is a great save!

0.4v on SYSCLK_SYS32K_RTC 3.3v on RTC_RESET_L edit: BOARD JUST TURNED ON when i checked voltage on PCH_SRTCRST_L drawing 14 watts... PCH_SRTCRST voltage was slowly dropping starting around 2v when I checked it. Seems to go up to around 1.5v then back down slowly, then spikes up... edit- C1802...

regular mode, plugged in SMC bypass mode CPU_ISENSE 0v 0v DCIN_ISENSE 0.04v 0.04v HDD_ISENSE 0v 0.01v BMON_ISENSE 0v 0v CPU_HI_ISENSE 0.07v 0.01v OTHER_HI_ISENSE 0.08v 0.02v MEM_ISENSE 0v 0v CPUVCCIO_ISENSE 0v 0v AXG_ISENSE 0v 0v CPU_VSENSE 0v 0v DCIN_VSENSE 0v 2.08v...

diode mode to ground on both sides of L7630 is 009 which is identical to working board. 13 5v 14 5v 3 3.3v

are you sure it couldn't just be an issue with U7000- as the line that had a high voltage through it also goes to U7000?

550 on the BCA_SCL- this was the one shorted to PPVBAT_G3H_CONN 520 on the BSA_SDA

PM_RSMRST_L stays high even when power button shorted but no pulse in PM_SLP_S4_L

IN SMC BYPASS- SMC_PBUS_VSENSE 1.4v SMC_DCIN_VSENSE 2.08v SMC_BMON_ISENSE 0v SMC_DCIN_ISENSE 0.04v

7100 0.89v 7630 0v 7720 1.8v 7730 1.15v 7760 0.04v 7770 1.5v If you were referring to page 73 and not sheet 73- U7300 12 5v 17 0v 16 3.3v 6 1.8v 8 1.5v 19 0v 18 0.68 15 6.58 14 13 1.5 11 20 0.06 9 1.8 3 0v 1 5 0.74 If you were referring to sheet 73- PP3V3_S3_FET 3.3v PP5V_S5_P5VSUSFET 5v...

all L75xx & L76xx have 0v both sides still 0v in SMC bypass L89xx have 0.89v L7330 1.5v L8310 1v L7220 5v

Yes I have been using 85w magsafe 1 original charger

yes I have been using the pads yes SMC_ONOFF_L stays high while board is connected to power PM_PWRBTN_L also stays at 3.5v when board is connected to power when I short SMC_ONOFF_L to ground, PM_PWRBTN_L goes down to 0.3v