A1706 820-00923-A, turns on after SMC reset only

[Vogelek23]

Hi guys, I've got the computer in title with strange issue - it only turns on after SMC reset (CTRL-ALT-SHIFT + POWER). When turned on, it works perfectly fine, passes AHT and benchmarks, all 4 TBT ports work fine, it does restart correctly every time. Once it is turned off (Shutdown under the OS) it won't back on with power button pressed or lid open - SMC must be reset in order to get it start. I have replaced the power button, reprogrammed EFI, reballed SMC - no luck. Battery is 100% charged now but it happens when battery is low as well. No single sign of spillage anywhere and all sensors are white. What else may cause such problem?

 

[2informaticos]

Check the exact SMC_ONOFF_L, SMC_RESET_L, SMC_4FINGERS_RST and BUF_SMC_RESET_L level.
Clean J6100 and inspect R7090 for corrosion; you may force 33-47K in place.
Try changing U8510...

 

[2informaticos]

Thanks for feedback.
All solutions to strange issues are welcome.