Bulb in Frigerator side quit working. Changed bulb but still wouldn’t work.
Can you check to see if you have power to the light socket?
If there is not power you may have a bad door switch.
If there is power the center contact in the light socket may not be making contact with the light bulb.
I have had a couple were I had to unplug the refrigerator and reach into the light socket with a small flat blade screwdriver and lift up the center tab a bit so it would make good contact with the light bulb.