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6-1

FAILURE MODE FLOW CHART

Check voltage – Main PCB(002A) CN14 (Pin 10 and 12)

No display (No power)

Blank display

Enter key input

Yes

Some beep

sound?

Cook-top display

blank?

Check AC input voltage of Main PCB

- Main PCB CN3 (pin 1 and 3)

Replace the cook-top display PCB(010B)

(-)4.5V ~ (-)5.5V ?

END

Replace the main PCB(002A)

END

CN14(Pin 10 and 12)

The voltage should

be (-)4.5V ~ (-)5.5V

Main PCB(002B)

Yes

Check the thermal fuse

(See the page 3-1)

(Go to page 6-3)

LG LRE30451ST Service Manual

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