LG Electronics LMV1825SBQ, MV1825SW service manual Circuit board Poor

PROBLEM - C: Display does not start countdown when START key is touched.

1

Check: 1. TOUCH KEY BOARD (START KEY FUNCTION)

	Continuity	Check contact of
	OK	connector S1
Check continuity of connector
CN2 between Pin 1(PK) and
pin 3(BL) when the door is
closed	No	Adjust or replace door
	continuity	sensing switch.

Contact	Replace	Normal
OK	Circuit board	circuit board
Poor	Correct	Normal
contact	seating	contact

Normal Primary

switch

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7-22

PROBLEM - D: Unit operation seems to be normal but little or no heating is produced in oven load.

	Check: 1. AIR VENTS
1

	Resistance	Replace H.V.C.	Normal H.V.C.
	incorrect
Normal	Measure resistance
operation	of H.V.capacitor
	(see page 7-16)
	Normal	Replace	Normal
	resistance	magnetron	magnetron

Check operation of fan	Resistance	Replace
motor when START key			Normal
	incorrect	fan motor
is touched.
			fan motor
No	33
operation
Measure resistance
of fan motor
Terminal A~C: 140 to 150 ohm	Normal	Replace	Normal
Terminal A~B: 25 to 40 ohm	resistance	circuit board	circuit board

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