LG LMVM2055ST Service Manual page 29

COMPONENTS
TOUCH KEY BOARD
NOTES:
• A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR
ANY REASON.
• MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.
• WHEN REMOVING THE WIRE LEADS FROM THE PARTS,BE SURE TO GRASP THE CONNECTOR, NOT
THE WIRES.
TEST
Measure the resistance between terminal
pins of 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)
1 2 3
3
1 2
8
COOK
N.C N.C
TIME
9
(VENT) (VENT) LIGHT CHICKEN
ON/OFF 5-SPEED CHOICES
HI/LOW/OFF
10
POPCORN COOK
REHEAT
DEFROST
11
CUSTOM HOLD
N.C
SET WARM
12
POWER STOP/
N.C
LEVEL
CLEAR
13
7-18
4 5 6
4 5 6
7
N.C N.C N.C N.C
AUTO
SOFTEN MELT
TIME SET
AUTO TIME QUICK
EZ-ON
DEFROST DEFROST
TIMER
CLOCK LESS
MORE
START/
8 9 0
ENTER
RESULTS
When
touched
Resistance
value
Less than
400 ohms
FPC CONNECTOR
Top
7
When not
touched
More than
1 mega ohm
1
2
3
4
5
6
7
8
9
10
11
12
13