LG KP105 - Keypad Trouble

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.6. Keypad Trouble
TEST POINT
CIRCUIT DIAGRAM
5
RIGHT
2
LEFT
#
8
SEL
MENU
KEY MATRIX
END
9
4
0
UP
3
DOWN
*
6
SEND
7
1
SW305
2V0_VRTC
SW304
SW317
SW307
SW302 SW306
SW308
SW318
SW316
SW303
SW315SW312
SW319 SW320
SW313
SW301
SW309 SW311
SW310
SW314
KEY_IN3
KEY_OUT1
KEY_IN4
END_KEY
KEY_IN0
KEY_IN1
KEY_IN2
KEY_OUT4
KEY_OUT3
KEY_OUT2