LG LSE4613ST Service Manual page 80

CHECKING FLOW CHART BY FAILURE
F3 error (Button short error)
Or button does not input
Unplug the unit
1
Check the connecting states
between Key pad and
CN03 of Main PCB.
Is it OK?
Reconnect
No
or adjust the
connection
CN53
Yes
Plug in the unit
2
Replace the Control panel.
(With Glass Touch PCB)
And then check button operation
using key test mode
o enter the test mode, follow these steps:
1. Press the any button, and encoder is placed
in the Off
2. Press the button in the following order
: + → → _ → → Oven light
(Oven Light hold for 3 seconds).
3. Press the OVEN LIGHT button again.
(hold for 3seconds)
4. Select the "t7" by press the + button
5. Press the START and Check the button.
(Refer to the next page, appendix)
3
If button is not operated,
Replace the Main PCB
9-20
Yes