Fridge problem

[Beerman]

Hi guys, I have a Norcold 662, the toggle switch for on off humid was not working on normal so I switched it with a new one. When I plugged it back in it had no power, long story short I figured out it blew the 3 amp fuse. replaced fuse and still no power, I thought the new switch might be bad got a new one still no power. It has power to the board in the access panel but the fridge doesn't run, no lights or anything.
Any ideas?
Thanks
Brian
PS it worked fine before but it is 20 years old.

 

[Beerman]

I guess I will fix it somehow did not know new ones were $1500  on the cheap end ugggggggg
any good sites on how to test circuit boards for dummies?

 

[John Canfield]

Here's the service manual for your fridge.