820-3332 fan spin, no chime, no image

[Outofwhack]

Loose screw inside case
No liquid damage visible

no usb activity
all_sys_pwrgd. 3.3v
pm_slp_s4_l 3.3v
ppvrtc_g3h 3.3v
pp3v3_sus 3.3v for 30 seconds until fn stops then 0v
ppvcore_s0 0.8v
pp1v05_s0 1.05v

Thermal: CPU quick to get very hot (3seconds). PCH slow to get hot, U3600 TBT chip slow to get hot 55c

 

[2informaticos]

Did you test in safe mode?
Reflow U8900 and test again.

 

[Outofwhack]

Safe mode -> chime, usb activity and video! Fan shuts off before can fully boot. (although I cant seem to repeat it)
Then performed a reflow on U8900 - no change.

 

[2informaticos]

Test disabling GPU.