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you need pp5v_s5 for this machine to power on. I would inspect U7201 to make sure this chip is functioning properly( voltage in, enable signals)

i think you need to investigate the pp5v_s5 issue.

i did check j4002 really good under microscope. i just thinking that the same fan spin issue on 2 machines with the same SMC chip is kinda a common denominator. but won't know for sure until donor board arrives and hopefully has a good SMC. thanks for the help guys. I'll keep you posted.

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i recalled the smc to only end up with the same issue. i ordered a donor board to replace the SMC, then got another one of these that came in with liquid damage.. so i fixed it got it running but fans on high. took that SMC off and put on this board, now the machine turns on and runs but fan on...

resistance to ground on pin5 of u5110 0.466kohms. pin4 smc_manual_rst_L is kinda strange at 2.7v, pin 8 is at 3.3v, pin6 is 3.41v, pin1 and pin3 at 3.42v, pin 7 at 3.42v

working on a 820-00165 that was working yesterday just fine, left it plugged in to charge overnight and now no green light on charger. pp3v43_g3h is present smc_bc_acok is present ppubus_g3h is low at 8.13v smc_rest_L is way low at 1.014v r5100 30koms I'm thinking I've got a bad smc, even...

What year is this and what is the board # ?

I went ahead and replace the connector and check for continuity like you said and everything was fine there. I did diode mode test on R0530 pin 1 reads out as 0.015v pin 2 0.030v. also noticed that i do get a pulse of 5v on L3800 then back to 0.0v. Not really sure whats going on with this board.

Shit wasn't thinking on that one. i retested with everything plugged in. ASD OS fails for sensor group test- limit load test. error -1 unknown error ASD EFI fails for display port symbol error test - error- Lane count is zero sensor temperature (th0a) -- SSD A sensor is reading below low...

yea was thinking the same thing but don't have a donor board for this board yet looks like ill be buy one though.

okay i replaced the SMC now it boots but with fans on high and what looks like safe boot. i ran the on board diagnostics and it cam back with "there maybe an issue with your trackpad". ref code NDR001 "There may be an issue with the SMC". Ref code PFM006 "There may be an issue with the power...

I'm just wondering if anyone has a source they would be willing to share for 2015 15" macbook pro retina display panels?

sounds like a bad SMC or something is messing with it. can u get it up and going then run ASD to see what it comes up with?( while fan is plugged in)

i was able to run ASD and yes it had a symbol error( but i didn't have a screen connected) SMC_LID area seems just fine looking. it also failed for 6 other issues also. the one i was thinking is not correct is sensor- current (IO5R) 5V Rail Highside --- sensor reads below the low limit. when i...

i was able to restore the green light, but no power on after replacing the ISL6259. I seem to remember one of louis videos where he was describing what different voltages on ppbus_g3h meant, but for the life of me couldn't find it again.

just double checking my info, but was it ppubs_g3h being 12.3v( which seem too low) than means no smc?

PPBUS_G3H 12.30v SMC_BC_ACOK is 3.4v

sorry too used to going strait to diode mode. resistance to ground is 64kohm

well what was the fix?