No display on Whirlpool RBD275PDQ14

[Sot]

Hi folks.  Not long ago I heard a series of beeps from my kitchen (one long and four short beeps, if I remember right) and found it was my oven.  The oven seems to work fine except for the fact that the digital display is blank.  But I pulled the breaker and opened the cover, and found that one of the varistors on the suppressor board was fried.  I got a new one but while replacing that I found that one of the traces on the circuit board was completely burnt off as well, so I guess I have to replace the whole board. 

My fear is/was that something else is burned up.  So, I secured a wire across the burnt trace on the circuit board just so that I could power it on and verify that it would work right again after I replaced the board.  Unfortunately, still no digital display. 

So what's the best way to determine whether the display has failed due to a problem on the suppressor board, the control board, or something else?  Should I just start replacing parts until the problem goes away?

[LowSL2]

If the display and other related components are fried, I would suspect the transformer has gone out. Part # 9760587

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[Sot]

How would you suggest testing that?  The primary and the secondary of the transformer are not open; one's about 55 ohms and the other just a few.

[domain]

How would you suggest testing that?  The primary and the secondary of the transformer are not open; one's about 55 ohms and the other just a few.

I believe 120 vac in/ 24 vdc out.

[RegUS_PatOff]

I believe 120 vac in/ 24 vdc out.

I believe 120 vac in/ 24 vAc out. 

[domain]

I believe 120 vac in/ 24 vdc out.

I believe 120 vac in/ 24 vAc out. 

Ooooooops. Sorry!