Having problem getting oven started. Depressing oven on the keypad doesn’t do anything and approx half of the items on the keypad doesnt functions. Nothing happens when the keys are depressed. Have replaced part MAKE=WPL P/N = 740099154 DESC = CNTRELEC. HELP - 
Thanks…
Here are your parts
Replacement parts for JENN-AIR JGR8875QDS RANGE- S/C F/S GAS | AppliancePartsPros.com
The part number you listed does not cross reference to an AppliancePartsPros number so I am assuming you replaced Item 2 in Section 3.
So it looks like the control panel/keypad (Item 1 in Section 3) is the cause.
See the attachment for the tech sheet.
It shows the pin outs for the keypad/ribbon cable. You will notice that each circuit track is for a number of keys.
You could check the keypad using a meter just to confirm that is is shot.
Could also try the following.
Connector Cleaning / Checking
Unplug the unit
Open it up
Remove the ribbon cable from the keypad to the control board at the control board.
Clean the edge connector.
If it is the type where there is not a connector just the insulation is removed, it can be cleaned with a pencil eraser. Do not use an ink eraser as it is too abrasive.
Check the tracks in the ribbon cable for hairline cracks. A magnifying glass helps here.
Would not hurt to clean the connector on the board. Use electronics contact cleaner or isopropyl alcohol and a tooth brush. Be gentle and do not reconnect till all the solvent evaporates.
Reconnect everything and give it a try.
JGR8875.pdf (373.6 KB)