LG LSWS306ST Service Manual page 67

F3 error (Button short error)
Or button does not input
Unplug the unit
1
Check the connecting states
between Touch PCB and
CN44 of Main PCB.
Is it OK?
CN44
Yes
TROUBLESHOOTING
Reconnect
No
or adjust the
connection
7-21
Plug in the unit
2
Replace the Control panel.
(With Glass Touch PCB)
And then check button
operation using key test mode
To enter the test mode, follow these steps:
(1) press the any button
(2) press the OVEN LIGHT and turn Right Time &
Temp Encoder at the same time
(3) press the OVEN LIGHT and turn right Time &
Temp Encoder again.
(4) press the START TIME button
(5) Check the button.
(Refer to the next page, appendix)
No
3
If button is not operated,
Replace the Main PCB