99% of "no color" symptom will be the 9-86-## color board. Be sure to
get the right -## ( letters dont matter). The 9-89 only has the video out & 3 color drivers. This all assumes correct fine tuning & a good source.
If you trouble shoot the 9-86 odds are its one of the IC's. Both were common & used in other brands. The zenith PN's for IC's starts 221-### ( sometimes with -## at end).
While you are in there both the 9-89 & the 9-88-## have ceramic resistor
packs, flat white & black. They always get cold joints so solder them up
before putting together.
BTW Problems with the 4 lead cap A.K.A. safety cap do NOT apply to
your set.
Good luck & stay well
73 Zeno
LFOD !