This board powered on for about two seconds then it’d turn off.
It’d show the same behavior if running from the magsafe or battery.
The board would start and POST normally in SMC bypass.
Nothing wrong on pins 17-18, 27-28 of ISL6259.
Nothing gets abnormally hot, checked when running in smc bypass.
Noticed that I have a short on PP3V3_S5_AVREF_SMC.
Short located to u5110, after replacing it, board starts normally.
January 8, 2016