Keypad Trouble - LG KG270 Service Manual

4. TROUBLE SHOOTING

4.6. Keypad Trouble

TEST POINT
CIRCUIT DIAGRAM
R215
R201
R211
R203
R209
R204
KEY MATRIX
END_KEY
1
SW201
R201
KEY_OUT1
680
C205
NA SW206
4
R203
KEY_OUT2
680
C206
NA SW211
7
R204
KEY_OUT3
680
C207
NA SW216 *
R209
KEY_OUT4
680
C215 C216
NA NA
R211 680
KEY_IN0
R212 680
KEY_IN1
R213 680
KEY_IN2
R214 680
KEY_IN3
R215 680
KEY_IN4
R214
R212
R213
2V0_VRTC
END
SW200
2 3
LEFT
SW202 SW203 SW204
SW207 SW208 SW209
5 6
UP
SW212 SW213 SW214
8 9
RIGHT
SW217 0 SW218 # SW219
DOWN
C217 C218 C219
NA NA NA
- 60 -
SW205
MENU
SW210
SEL
SW215
SEND
C220
NA