Before condemning the control board, rule out the simple causes of an unresponsive panel.
Clear the Control Lock
Many ovens have a lock that disables the panel.
Fix: Hold the lock or clear key for a few seconds to release it.
Power-Cycle the Oven
A momentary glitch can lock up the electronics.
Fix: Switch off at the breaker for a minute, then restore power.
Suspect the Control Board
If it stays dark or unresponsive, the membrane or control board may have failed.
Fix: A technician can test and replace the affected part.
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