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PP1V5_S0, PP1V05S0_LL, PP1V35_S3, PP3V3_S5, PP5V_S4 all pulse. SMC Bypass same thing. When I trigger SMC_ONOFF_L there is a drop pulse at PM_PWRBTN_L, PM_SLP_S4_L pulses every few seconds with the trigger

This board came dead, clean board Found a short on PP12V_G3H_P3V42 (C7806) but even after fixing that I had no power Replaced Q7950, Q7970, U7950 and U7970 board now turns on sometimes but LED 1 is off, 2-3-4 are on when iMac is assembled but sometimes it wont turn on. When board boots...

Clean board no history. PPBUS_G3H: 12.54v PP3V42_G3H: 3.4v PP5V_S5: 5v PP5V_S4: 0v PP3V3_S5: 3.3v PP3V3_S4: 0v PP3V3_SUS: 3.3v PP1V05_SUS: 1.05v Original 85W Magsafe 2 charger When I trigger SMC_ONOFF_L and there is a drop pulse at PM_PWRBTN_L, cant check pulse on PM_SLP_S4_L because it...

Board had some water damage. After UC replaced most resistors around U1950 and also U1950 same thing. PPBUS_G3H -> 8,56V PPVRTC_G3H -> 3,3V ALL_SYS_PWRGD -> 0V PP5V_S5 -> 5V PP3V3_S5 -> 3,3V PP3V3_SUS -> 3,3V When I Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L (at same time) I...

PPBUS_G3H is 12.6V But pin 1 of U7400 (CPUIMVP_TONB) is 12.3V R7403 is fine. ALL_SYS_PWRGD does pulse, but VCORE does not. Checked all other rails on page 8 all okay. Thanks!

Yes checked all SPI resistors and traces, all look clean, overall board looks clean

CHGR_RST_IN 0V at all times. R/C/Q7030/40 all look okay. Checked all 4 CD3215 chips again and the surrounding components and all looks good. Remember the machine makes it to 20V 0A only with battery connected but the Mac does not power on. The Mac also does not enter DFU mode.

U7400 does not exists in that IC

I checked all CD3215 on another board and all of them make it to 20V, I reballed them again and installed them back, also replaced U3000 and U2800 and UB000 just in case as well as U7000 but I get the same exact 5V and 0.080A on all 4 ports without loops on any othem. CD3215 Pin 2...

U7400's voltages: 19/29 Pulses 46 Pulses 47 Pulses 1 Steady 12.3V 49 Does not exist 48 Steady 12.3V but reboots every few seconds

My bad ALL_SYS_PWRGD does pulse, I was measuring ALL_SYS_PWRGD_R

3V3_S0 does pulse.

L7260 PP5V_S3 L7330 PP1V5_S3 L7630 CPUVCCIOS0_LL L7100 PPVCCSA_S0_REG_L All the above pulse

Nope, stays at 5V as indicated in first post

Thanks, if I check TBT_T_SPI_MISO and TBT_T_SPI_MISO with scope and the signals are correct on both sides of Mac does that mean U2890 and UB090 are good as far as allowing the Mac to go to 20V? Replacing this chips is a pain...

No pulse after removing Q7950

All pulse but this dont: L7560, L7550, L7510, L7520 and L9701

Board came in with a short on PP5V_S3 U7200, replaced it 2 times just in case, short gone and now board makes it to PP5V_S3 with 0V and about 5 seconds later it pulses to 5V, most other rails also pulse, board is pretty clean otherwise. SMC, U7400, U6100 (With Clean BIOS) replaced but same...

Would U2800 or UB2800 make the board stay at 5V and not charge or boot?

Right now it is not turning on, I do get 20V with battery connected but no charge or power UPC_I2C_INT_L is 0.3V