bit confusing (for me), a trace for boot rom was broken resulting in no sign of life and cycling S4 - S0 lines. thankfully there were test points at both sides to solder to. it's the "rare" i7 config as well!
ordered it months ago but didn't try to fix it until today.. i've been feeling yucky and i'm happy to accomplish something minor 😋
silly 2015 mbp 13" situation today, no force touch (touchpad worked otherwise) and it only turned on intermittently with the touchpad connected... turns out this random capacitor on the bottom of the touchpad daughterboard was visibly burnt, and immediately crumbled into powder when i squished it with pliers. now it boots reliably and force touch is back?? not complaining, lol