Failure Mode Flow Chart - LG LRE30451SW Service Manual

FAILURE MODE FLOW CHART

No display (No power)
Blank display
Enter key input
Some beep
sound?
Yes
Cook-top display
blank?
Yes
Check voltage – Main PCB(002A) CN14 (Pin 10 and 12)
Replace the cook-top display PCB(010B)
No
Check the thermal fuse
(See the page 3-1)
No
Check AC input voltage of Main PCB
- Main PCB CN3 (pin 1 and 3)
Main PCB(002B)
(-)4.5V ~ (-)5.5V ?
Yes
END
6-1
CN14(Pin 10 and 12)
The voltage should
be (-)4.5V ~ (-)5.5V
No
Replace the main PCB(002A)
1
(Go to page 6-3)
END