Test Procedures - LG LMV1825SB Service Manual

COMPONENTS
TOUCH KEY
BOARD
SENSOR
(For sensor model only)

TEST PROCEDURES

Measure the resistance between terminal
pins of connector KEY CONNECTOR.
NOTE:
When reconnecting the FPC connector,
make sure that the holes on the FPC
connector are properly engaged with hooks
on the plastic fastener.
MATRIX CIRCUIT FOR
TOUCH KEY BOARD
CONNECTOR(KEY CON)
2
1 3
VENT VENT
N.C N.C N.C N.C N.C N.C
HI/LO/OFF HI/LO/OFF
8
LIGHT LIGHT CUSTOM CUSTOM
N.C N.C N.C N.C
HI/LO/OFF HI/LO/OFF SET SET
9
LESS LESS CLOCK CLOCK Ez-On Ez-On N.C N.C
10 10
LIGHT LIGHT
CUSTOM CUSTOM
N.C N.C N.C N.C
TIMER TIMER
COOK COOK
11 11
TURNTABLE TURNTABLE STOP STOP
START START
N.C N.C
ON/OFF ON/OFF CLEAR CLEAR
12 12
SENSOR SENSOR SENSOR SENSOR SENSOR SENSOR
MORE MORE
PIZZA PIZZA POPCORN POPCORN
POTATO POTATO
13 13
Figure 27
Figure 29
5
4 6 7
TIME TIME
5 0
COOK COOK
AUTO AUTO
6
1
DEFROST DEFROST
KITCHEN KITCHEN
7 2
TIMER TIMER
POWER POWER
8
3
LEVEL LEVEL
HOLD HOLD
9 4
WARM WARM
SENSOR SENSOR SENSOR SENSOR SENSOR SENSOR
VEGETABLE COOK COOK
REHEAT REHEAT
Normal: Approximately
Abnormal: Infinite or several.
1 BK
2 RD
3 WH
7-17
RESULTS
When
Resistance touched
value
Less than More than
400 ohms 1 mega ohm
FPC CONNECTOR
Top
Figure 28
BK~RD: 4.5~6.2 Kohm
RD~WH: 2.0~3.5 Kohm
BK~WH: 2.0~3.5 Kohm
When not
touched
1
2
3
4
5
6
7
8
9
10
11
12
13