LG LRE4213ST Service Manual page 69

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?
Yes
TROUBLESHOOTING
Reconnect
No
or adjust the
connection
CN53
7-21
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 CLEAR button
(2) press the BAKE and BROIL buttons at the same
time
(3) press the BAKE and BROIL buttons at the same
time again.
4) press the NUM 7 button
(5) Check the button.
(Refer to the next page, appendix)
No
3
If button is not operated,
Replace the Main PCB