F3 Error (Button Short Error) Or Button Does Not Input - LG LUTE4619SN Service Manual

F3 error (Button short error)
Or button does not input
Unplug the unit
1
Check the connecting states
between Touch PCB and CN53 of Main PCB.
Is it OK?
CN1
CN2
CN1
CN53
Yes
TROuBLEShOOTING
Reconnect or adjust the
No
connection
8-22
Plug in the unit
2
Replace the Control panel.
(With Glass Touch PCB)
And then check button operation
using key test mode
(1) Press the Upper or Lower CLEAR/OFF key.
(2) Press the button in the following order
: + → － → START/Oven Light(START/Oven Light hold for 3 seconds)
(3) Press the START/Oven Light button again.
(4) Select the "t3" by press the + button and press the START/Oven Light
button.
(5) Check the button.
(Refer to the next page, appendix)
No
3
If button is not operated,
Replace the Main PCB