Frigidaire oven won’t heat

My gas oven had stopped working. Broiler and stove top work. Tested igniter’s and gas safety valve and there good. Replaced power control board and still the igniter won’t come on. What am I missing?

Hi,

https://cdn.appliancepartspros.com/images/diagrams/dcache/31203703_4.gif

Which did you replace? 20 or #97?

jeff sr.