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Yes L7820 pulses too

PLT_RESET_L does pulse SMC bypass same thing

3V3_SUS = 3.3V I do get a drop on PM_PWRBTN_L and PM_SLP_S4/3_L Also when I first connect the charger I get all voltages for less than 1 second, even VCORE comes high at 1.8V but then goes to 0V shortly after.

Board had corrosion on U7820 all else looked fine, after replacing and repairing U7820 I am now stuck at all_sys_pwrgd 0V. PPVRTC_G3H 3.2v PP3v42_g3h 3.42v Pp5v_s5 5v Pp3v3_s5 3.3v all_sys_pwrgd 0v Pp5v_s4rs3 0v PM_BATLOW_L 3.3v PM_DSW_PWRGD 3.3V SMC_ADAPTER_EN 3.3v PCH_DSWVRMEN 3.3v...

Ok I got the new chips and have already installed them both U8100 and U7700 but the behavior is the same. Now I have also noticed that PPVDD_DISP_AWAKESW is 0.070 and PPVDD_SOC_S1 is 0.040 in diode reading and if I am not mistaking this should be 0.199 and 0.130 For now this has turned into a...

Tried the flux trick, same problem. Yes, all my test and measurements are done with the board alone unless I need to test something else additionally. Thanks!

Clean board, had 2 caps on PP5V_S4 getting hot but not full short, after removing them and installing new U7560 I got 20V on charger but CPU core voltage does NOT go from 1V to 0.6 Tried good known bios with Medusa 3 also but same thing. pp3v3_g3h 3.4v ppbus_g3h 13.07v pp5v5_s5 5.12v pp3v3_s5...

Ok some feedback, I reballed the CPU same problem, I have become proficient at doing this now, since that is the case and I have some of this boards here with shorted PCH or CPU I decided to do a CPU swap and same problem, so it is a bad CPU indeed, thanks a lot!

SMC_LRESET_L 3.3V Check all those resistors Replaced SMC just in case, same result all around.

Board had a tiny bit of corrosion on U3540, replaced that and now it gets stuck around 0.360A steady no loop. VCORE 1.8V steady, no LIO flex or SMC bypass same thing. Already tried: Clean known good BIOS Raballed CPU PP3V3_SUS 3.3V PLT_RESET_L present 3.3V PLT_RST_BUF_L 3.3V ALL_SYS_PWRGD...

Thanks, at the end before I saw this post I left the working serial number and installed MacOS via CCC from a disk image and done, small updates work fine is just full upgrades that dont, this Mac will not update past Ventura so this should work for now. Thanks, I will keep the BIOS files just...

Heating with good flux did not work, but booted once, that gave me hope so I did a complete reball of the CPU and now it is working constantly, thanks!

Ok new clean BIOS different serial, I now have the model year but same error when trying to update or install OS

Tried with Full BIOS (clean ME) with changing serial number and the program I use automatically fixes FSYS checksum, I have used it for a while now. Same exact problem.

Clean board, customer states that while trying to update Mac gave him an error and Mac wont install any new OS past Catalina, we tested and the problem we can replicate here. Installing Catalina no problem, but intalling from scratch or updating past Catalina wont work it states that it is not...

Board came in before but worked after a few measurements taken, now it is back again. When I trigger SMC_ONOFF the board almost boots all the way and CPU seems to start to work, but shuts down shortly after. PLT_RESET_L pulses to when I trigger SMC_ONOFF

U1950 pins 7 & 3, PM_SLP_S3_L, ALL_SYS_PWRGD and big coils all get a pulse when I trigger SMC_ONOFF.

PM_SLP_S3_L = 0V, pulses once when plugging charger then goes down to 0V and stays there so no pulsing here, just made the commend for reference. U1950 pins 7 & 3 both 0V no pulse ALL_SYS_PWRGD 0V no pulse

Ok discover that R7121/22 were blown, Im not sure if it was cause my LIO board was old and a little bit corroded, after replacing those resistors and testing with a different LIO board still same problem. L7130 and L7560 are steady all other 0V, no pulse. PM_SLP_S3_L 0V, pulses once when...

I do get a drop pulse on PM_PWRBTN_L PM_SLP_S4_L is 0V when I trigger SMC_ONOFF I get a fast pulse that goes up towards 3... volts then drops down to 0V