I have worked on many 169 chassis. In your case as someone else said do
not try to fire up chasis with out yokes connected. Remove the entire
light box (with all cir bds & crt's main chassis can be slid out to be
worked on, May have to lenghten ground wire from chassis to HV Div
Block. 1st check raw B+ off the bridge rect Around 170v DC, check all
secondary rectifiers, Hor Out Xistor, chopper xistor,for shorted
condition. Do all this before trying to turn on. Next check standby B+
should be 143-146 v. if not there check pin 16 of U4101 IC should be
around 11v if very low IC is defective, If standby v is high check 2.2
mf off pin 6 of ic, also check 39 or 47 mf cap in base cir of chopper.
These are the most common problems, feel free to contact me for further
info if needed. Also if all chassis not interconnected set will not
have light on crt's (safety cir)
I could email schematic of power supply if you like, you really do need
it Charles Grob