LG HB620 Service Manual page 64

3.10.4 Key Pad
There are 29 key buttons. Shows the Key Matrix & Keypad circuit. 'END' Key is connected to
PMIC(PM6650).
COL(0)
ROW 0 SEND
ROW 1 SOET1
ROW 2 UP
ROW 3 SOET2
ROW 4 LEFT
VREG_MSMP_2.7V
(VT CALL)
KEY_ROW[0]
(JAVA)
KEY_ROW[1]
(MENU)
KEY_ROW[2]
KEY_ROW[3]
KEY_ROW[4]
KEY_COL[0]
KEY_COL[1]
KEY_COL[2]
KEY_COL[3]
KEY_COL[4]
KEY MATRIX
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
COL(1) COL(2)
1
2
3
TV Guide
OK RIGHT
[Table 3.11] Key Matrix Mapping Table
HOT501 501 502 503
HOT502 504 505 506
HOT503 508 509 510
HOT504
HOT506 HOT507 HOT508 HOT509
[Fig. 3.22] Main Keypad Circuit
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3. TECHNICAL BRIEF
COL(3)
4 7
5 8
6 9
MYch
CLR
CN503
1 100ohm
R904
2 100ohm
R905
3 100ohm
R906
star
4
507
sharp
HOT505
CN504
HOT510
3 100ohm
R907
2 100ohm
R908
1
COL(4) COL(5)
* SIDE1
0 SIDE2
# SIDE3
MENU HOOK
DOWN
KEY_ROW[0]
SIDE_VOLUME_UP_KEY
KEY_ROW[1]
SIDE_VOLUME_DOWN_KEY
KEY_COL[5]
KEY_ROW[2] SIDE_VOLUME_CAMERA
KEY_COL[5]
SIDE KEY
LGE Internal Use Only